5 reasons Why You Should Be Using Shorter Cranks
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- čas přidán 5. 06. 2024
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Expert Bike fitter Neill Stanbury explains to us some major benefits of using shorter cranks on your bike. There are many use cases where going shorter will improve your position, comfort and even increase power on the bike. But is the minor downside worth it?
#cycling #roadcycling #training #bikefit
0100 here in Spain. The missus upstairs probably waiting for me to come up for a jangle........she can wait. Stanbury just dropped new content. Kettle on the boil. Im opening the good biscuits. What a time to be alive.
New vocab to investigate: “jangle”
Has something to do with long stems
You've got your priorities straight!
@@pauljohnston7522 Short crank!
I've ridden a variety of crank lengths in 56 years of cycling - 165s, 170s, 172.5s, 170 on one side and 175 on the other (long story) - and have never noticed any significant difference. I switched from 172.5s to 165s about 12 years ago in hopes that it would help with some knee problems. It didn't, but I've stuck with the 165s because there was no reason to change again. By the way, what eventually did make my knees better was strength training, specifically squats and deadlifts.
that saddle really steals the show
They are also really, really good...
But so awful looking 😢
I'd like to see someone mention humoring using one of those for mtb purposes, whether it be xc or trail riding. Could it have any place there?
@@Emolokz got one on my road bike, one on my gravel.
@@Hermod_Hermit those two instances certainly make sense, but I'm thinking more of with a dropper. Will the shape of this saddle ever interfere with the rider standing, manipulating body position over the bike as much as you do in trail/enduro type riding.
As someone who voids their bike's warranty just by sitting on it, I really appreciate the point about soft tissue opposition. It's something I rarely see a lot of discussion about on these sort of bike fit videos, but it's really helpful when it's included, even when it's not the main point of the video.
Agreed. Those moments of inclusivity are refreshing and, in this case, really helpful.
He really did say..."if you're really short down below"
Going from 172.5 to 165s changed my riding life. I actually did it on a whim after watching a few Neil videos. Turned out my a-symmetry and right lower backcpain was caused by a very stiff left hip. The pain literally went over night.
I am exactly suffering from the lower back pain ! been having it for almost two years. Did Physio, Chiro and joined the gym to strength training.. it helped a bit but the problem was never eliminated.. recently someone who saw me at the local track suggested that I change to 165 or 160mm crank length.. I always wanted to try it but kept pushing.. reading your message here gives me renewed hope ! and I will start looking at local options to try this ! Thank you man ! I really appreciate you..
@@s1lent51 I just got new crank arms from ali express! luckily my BBs and existing cranksets were compatible.
I have the same problem,lower back Pain when i do thershold training.i am 185 cm tall and have a 175mm crank on bike.think i buy the 170mm or 165mm for MTB
Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures your amazing knowledge of our anatomy and our physiology and how these interact with each other Neill your a one off and that's for sure i never met anyone with greater insight than you have in this area and how you make corrections for our shortcomings WOW.Thank you loved the video Sir.
Fantastic overview! Shame it's so inconvenient and often expensive to change cranks. Should be able to choose when you purchase the bike.
I've found the best idea is to buy used, rather than chase very, very minor design differences and paint jobs.
With the cash you save, changing parts is less painful and you get what you really want rather than what you're given.
30 years ago when I was racing people rarely bought new bikes fully equipped. You'd choose a frame, then a groupset, wheels, pedals, and saddle, and have a mechanic assemble it for you, or yourself if you were able. So you had full control over every part that went on the bike
I’m a big rider at 6 foot 230lbs and moved to 170 cranks and felt an amazing improvement. Currently building a gravel bike with 167.5 cranks and looking forward to it.
I've moved from 160 to a 140 crank and have loved it. Being 5'7 with a short inseam, I have loved the feeling of the cranks. Everything feels so much better.
I recently went to 160 cranks after staying with 172.5 for the last 10+ years along with raising my saddle by 50mmish, and the difference is amazing. I don't like to grind at low cadence so I also went from 52/36 to 50/34 on my crankset, and I can hold the rpm that is comfortable, along with making the power I have. All of this has led to an improvement of approximately 25w alone. On my first day wit the new fit and the new crankset I matched my ftp after being off the bike for most of a three-month period (rode once a week) and can hold those 25w at the same heart rate as before and I don't feel as tired as before. The better aero position is also a huge benefit as all of this has shown an almost 2 mph speed increase on my solo rides for a given effort. I have been talking to the guys on my team about it and I have convinced several to 1.) get a good fit, but 2.) shift to smaller crank length, especially those who are built similarly to me.
I have some hip flexor impingement , which resulted in a recent bike fit dropping the crank length from 172.5 to 165 . The improvement felt from this adjustment and other tweaks was pretty immediate. However, the major impediment to moving to this set-up is now actually getting 165 mm cranks that are compatible with the various BB set-ups. Here in Melbourne and most likely across Australia currently acquiring cranks or crank-sets of this length is near impossible.
Perhaps the shorter cranks and their benefits is an aspect now being picked up by bike fitters across the sector and hence this dearth in being able to acquire these length of cranks .
The fact you can't get them is obviously relieving riders' discomfort, as you can't get out and ride
I have a 165mm crank and it's great. I got it purely so I could raise my seat height to make my bike look pro 😅
just get a frame two sizes smaller... sorted
crank is cheaper than a new frame@@ribbyramone
So 10mm made it look pro? 🥲
You and other channels discussed this quite a few times since 4 years ago. I'm surprised that bike manufacturers still don't use shorter crank arms for their 2XS and XS bikes. If any change, it's a very reluctant one. I'm 167 and use 160 for both road and e-gravel (which has aero bars too).
I bought a Trek hardtail mountain bike in 2019, one with supposedly women's-specific geometry. Guess what cranks they put on it? 175mm, regardless of frame size! Ridiculous. I'm only 5 ft 4 1/2 inches tall (so about 163 cm, right?), but because I didn't know any better for the first 4 years I wondered why I struggled to climb even in bike's granny gear, and why my knees were sore after long rides. Last fall I bought 155mm cranks and the mechanic who installed them at my LBS was impressed with how they felt when he test-rode it. He is much taller than I am and he said 175s are even too long for him. What is Trek thinking?!?
Money
163cm here and use 160mm on the Road bike and 155mm on the Gravel (seat height 665mm). Even with 160mm cranks I still get toe-overlap with 700c wheels as I have a more mid-foot cleat position. Thank goodness I have 650b wheels on the gravel bike!
@@phil_dwould you mind sharing which 155mm cranks you’re using please? It’s so difficult finding reasonably priced shorter cranks for gravel
@@phil_d going up a frame size and down in stem length fixes toe overlap. Long stems only exist because pros wanted short bikes to get closer to their wheel
Neil, would be interesting to know how your saddle height compares to the heights “ recommended” by the various more traditional methods!
I'm 6'2 with really long femurs running 175mm cranks. But also I tend to spin high cadence 95+ for threshold and definitely a more aerobic kind of rider. So a bit conflicted maybe I'll try 170mm cranks some day.
if anyonre don't have physical limitations, than the most correct way to choose the cranks length is according to length of the legs. but not only inseam matters. it is important to take in account the ratio of hip and shim. if hip longer than shim it better proceed with longer cranks. if shim longer than hip it is better to choose shorter cranks. the ratio of hip to shim crucially influence on cranks length
I’m on 155 crank arm since I’m not a tall guy. It definitely helps during long-distance, and I just need to train more on cardio; when speed is required, crank up the cadence before shifting to a smaller cog.
Forever hip problems here, hips at about 45 like you show. Looking into getting some 165mm cranks right now, might start with 105 set to try, think the Ultegra and Dura Ace older cranks are on recall..
Road 170s for a long time, but not until I went to 175s did I gain the power I never had before. I am 6 foot with a 32 inch inseam. Any power training (90rpm) would give me sore knees. Now even at 66 years old can still power train, time trial / long mountain climbs, today with 175's. The hip flex test you mentioned: I am very poor in flexibility, something I have always known, especially hamstring flex, very poor.
Excellent disposition on crank length! Really learned a lot
+1 That was a very enlightening and well reasoned expert opinion.
Tried shorter cranks and had issues recovering post ride with more avg force on the pedals (at sub-optimal cadence I suppose). Went back to 175mm as I have long legs/short torso at 6’1” and reasonably good mobility.
I think you missed one very important category and it's not just riders on the tall or short extreme, it's the balance between leg length / inseam and your overall height. More like the distribution between your top and lower half. For instance, I am 5'9, 185 lbs, quite lean, no gut but my cycling inseam is 34.25 inches, very short torso, and huge femurs. Hip mobility is great, I can squat to the floor w/ flat feet and be totally comfortable but this is because my knees go way outside my torso. See Squat University's videos on squat stance for different physiology. This is exactly the same for cycling. Long or normal cranks mean my knees will be hitting me chest at a normal saddle height (I'm at 740). 165s were a drastic improvement from 175 and 170s but was still having issues w/ low back and hip flexor pain. Funny enough, this morning I just installed 160s on my bike, it feels INFINITELY better. I immediately was able to raise my saddle 10mm more, I feel way more stable, it's insane how much better it feels. Wish I woulda done it a few years ago.
Great, any drawbacks you feel from the shorter cranks? Harder to climb or anything?
I'll need more time on the 160s to tell. My understanding of the science on shorter cranks is efficiency and power output is not changed until you really get to extremes. The power curve just changes slightly, so you might lose a smidge of max power in a trade off for slightly lower power for longer. In my opinion, it's all about comfort. I'll trade anything to feel better on the bike, to ride more comfortably, for longer, train more etc. Also, opening my hip angle allows me to ride more aero so even if there was any power trade offs, they would be far outweighed by aerodynamic advantage.@@myxti3669
Thanks for talking about the other side of crank length(all bikes 172.5).... I've been thinking for a while about going to shorter and I may still go there(but maybe not 165 short), but as a B- .. C+ aging sprinter who only 'races' crits where do you change from relying on neuromuscular to endurance
Very informative discussion thanks. Another comment alluded to taking into account the relative length of the upper and lower leg bones. I’d be really interested to hear whether that’s something to consider. Unless the ratio is very unusual, would that really be a factor in bike fitting?
Love your show and it has helped me a lot. Q: When I switch from 172.5 to 170mm crank I feel pain in my right hip flexor. I have adjusted the saddle height accordingly.
Really info like it lots, will
I’ll have to try 165s so how it goes ✌🏾👌🏾
Im 6'1". Always used 175 mtb 172.5 road. Replacing my road crankset with a 170, mainly because there wasnt a 172.5 option but now Im interested to see how it will feel.
178cm(5'10'') here with long legs and long legs and flexible pelvis(so I sit high and reach far down), and I've gone to 160mm cranks to alleviate hip impingement. I actually had 155s early on, but then they got stuck to an old frame in a freak accident, and for some reason I didn't bother getting the aftermarket cranks again. Now I just need a new frame or fork, because my handlebars are too low(tolerable but not optimal) xD
Hi Neill! I was just wondering how do you rate the Bontrager Montrose saddles? I am riding a SMP Composite but I am always on the lookout for an improvement........ Many thanks.
How tall is Neil ? I’d love to know in relation to his saddle height. Another great video, love this .
I’m 167cm and recently started using 160mm cranks, down from 170mm. I definitely feel like I’m pedalling underneath myself. I didn’t notice much increase in cadence though
Does Neill uses any wedging in his bikefits like Steve Hogg?
Thanks for an answer!!!!
I tried going from 175 to 170, didn't work for me. I simply didn't enjoy riding with shorter cranks. I'm glad I tried it to put the question to rest for myself. I imagine for some people it would be a game changer though because the difference was surprisingly vast.
I'm 5'4" using 170mm on my TCR and 165mm on my Canyon and SL8. I noticed 165mm is comfy enough during long rides.
I've got zero hip flection issues, but bringing the knee near or past 90° gives massive recovery pain in ligaments. Short cranks help but I need more help
A question for neill: Does shorter crank exaggerate bike fitting issues? My leg discrepancy is more obvious as my left quad always start to hurt more than the right one, especially in TT position.
I’ve been experimenting with 145s, down from 170 and I’m seeing tons of benefits and no downside (apart from a frame with a bottom bracket that’s not at the optimum height).
Where did u get 145 cranks?
Purely from mechanical perspective, the produced power (P) is equal to torque (M) multiplied by angular speed (ω):
P = M * ω = F * l * ω
where "l" is lever length. Now, lever length is not exactly equal to your crank length, but it is very much proportional to it.
So, if you go for shorter cranks (l decreases), to produce the same power, you either need to push the pedals harder (increase F) or spin faster (increase ω).
Exactly! Thats why I go as long as possible, but at one point you going to see that your cadence decreases.
Either way you are still producing the same power, you're not getting any more watts for free by increasing the cadence or cranks. The more important aspect is what is more efficient for the body, which is a much more complex equation.
@@ryanm968 well, with more leverage its much easier to generate the same torque and therefore power. You are right about the bodymechanic aspect.
@@ryanm968 we know that lower cadence/higher torque for most people means faster muscle fatigue. So for a purely endurance event shorter cranks at higher cadences are probably better. For short events, like most track races, especially those with a standing start, the ability to produce more torque at low rpm is probably preferred.
You have to push harder or spin faster (if you’re in the same gear I would say). The one thing that no one has explained yet was changing chainrings (and cassette) in spite of shorter cranks. I plan on going shorter and I am going to need a larger climbing cassette and quite possibly go compact chain rings at the same time to ensure I am not under leveraged. In Bmx, single speed, if we go shorter, we simply make the gear change easier.
My sit height is 64cm and i’ve benefited from using 155 crank length. I’ve tried both road (straight arm) & mtb (bent arm) 160 crank length and still prefer 155 road crank.
I’m this calculation as gauge:
a) 163(height) x 0.95 = 154.85
b) 1.25 x 72(inseam) + 65 = 90 + 65 = 155
When I did the knee bend test my left leg was aboout 30-40 degrees, but the muscle was tight and stopped me moving anymore. My right was better, without the muscle stiffness. I will try shorter cranks.
I'm the same mate. Switching to 165s was really beneficial. I'm 6ft2 aswell
I had hip impingement and was having hip pain with 175mm crankarms on my mountain bike. I got 165s and the pain is completely gone. I'm also more of a cardiovascular rider and like to spin higher cadences, so its a win-win for me.
I have 175 mm crankarms and have lower back pain when i go mountainbiking.think go for 170mm or 165mm.i’am 185cm tall.howe tall ar you.
@@davychristiaens6421 I’m 5’7” or 170 cm
Thanks for the info always very informative!!! Have just gone to 155mm having a height of 5'-8'' and only 30in inseam man can i get the cadence up now !!!🙂
I use short cranks because I've got long legs and a barrel chest so I hit my chest with my knees (still happens in the drops)
👍
Because I'm old, my height today is 166 cm..😁
I've always ridden with 172.5 mm cranks.. I've sometimes tried shorter ones but they feel so strange.. besides, quality carbon fiber shorter cranks cost an awful lot..
More videos could be made for undersized people (under 165 cm 😁), adjusting the bike.
I concur. 3 ticks out of 5 for me. I swapped cranks from 175mm down to 170mm recently and feel much better.
I bought a used Trek Domane AL disc. It had a 170mm on the right and and 175mm on the left. I did not notice this or think to look for this. When changing out pedals, I did realize the difference. After a year I had not notice any hip or knee pain. Should I immediately change one or the other to match. Thanks
I just laid flat on the ground to test out criteria #1. My thigh contacts my lower rib cage and stops there. At that point, my knee is quite a bit away from my chest (20 cm'ish). I look nothing like Neil who somehow is able to have his leg, from hip to knee, touching his chest. Have I failed the test?
Soft Tissue Opposition (STO) lol
As an older rider (60 y/o) I certainly suffer from this condition.
It amazes me on how the industry arives at a standard. Given this discussion I wonder if the standard set-up for the average rider should be with 165's. I would venture to say the average rider would never think twice about having a shorter crank and would just ride it the way the bike shop sold it. However, they would have a much better physiological experience.
Thanks for sharing
Matt
Hudson Valley, NY
they should make 160mm cranks for size 52cm bikes and 165mm for 54cm
I use 160mm cranks and I'm thinking about going to 155's or even 150's. Going from 170's to 160's made a huge difference in comfort. I have hip impingement and going to shorter cranks really helps, as was said in this video. Another thing that has really helped is using Favero Assioma Dui Shi power meter pedals with a wider q-factor, and also using pedal extenders when I'm not using those pedals. Pushing out the foot stance wider means much better knee tracking and much less stress on the knees when you have hip impingement. I want to add that hip impingement is often just how your hips are built -- there's no flexibility training you can do to improve it, for many of us.
Wonderful post! 👍🏻Agree fully
I run 140mm on some bikes its fantastic
@@sempi8159 where do you get 140mm cranks? I've never seen cranks that short.
@@northkyt those are Diy but you get some that even go down to 130mm. There is a company in Japan that makes them. Do you need the website?
@@sempi8159yes please !
Hi Neill, Do you think using shorter cranks can also help fill out the dead zone in pedalling ? Im 173 cm in height and i use 170mm crank on my Aero Bike while 172 mm on my Climbing Bike. I have a huge dead zone from 8 o'clock position to 12 o'clock and would like to know if using shorter cranks would somewhat help fill this up. FYI, I dont have any hip flex issues and my saddle height is 695. What size crank would you recommend to get a better pedal phase and do you think using shorter crank would affect climbing efficiency ?
I'm surprised that none of the videos about shorter cranks makes any explicit mention of the reduction in leverage they give, although this was hinted at in this one at the end of this one. Going from a 172.5 to a 165 crank is about a 4.5% reduction in applied torque for the same force. and as power = torque*angular velocity, this means less power for the same cadence. Has anyone looked into whether there is any advantage in changing the chain ring tooth count with shorter cranks to compensate for the loss of leverage? You could compensate for the estimated reduction in torque by having 2 fewer teeth on the chain ring.
wht not going 172.5 to 180?
Another bonus that comes up less - I switched to 165mm on the road for less hip impingement/better ergonomics. I then switched to 165mm of road and it’s been a revelation. I don’t feel like I have less torque and I have almost no pedal strikes now, all while keep my crank length constant across my bikes now. It has turned out to be a win/win/win situation (ergonomics/consistency/fewer pedal strikes).
Hi, did you have to rise the saddle? And give more seatback?
@@franciscopizarroi When you switch to shorter cranksets, you do have to raise your saddle by the difference in crankarm length between the old and new setup (ex. 5 mm difference, raise by 5 mm). Saddle fore & aft needs no further adjustment.
Croder makes 140mm cranks that are designed around a 24mm shimano style spindle. Got a set for my 9 year old daughter’s 1st road bike, fits BB386Evo with spindle adapters.
What is her saddle height?
@@johnnyf5743510
@@johnnyf5743510mm, still has some growing to do before she fully fits it but in any case it’s ready for her and until then she has fun shifting through gears on the trainer. 2018 43cm Felt VR5W.
Croder, Cobb, Appleman...
@@johnnyf5743 my comment keeps getting erased. Five hundred and ten.
WoW. Gotta save some money and make my way down have a fitting. And a holiday ride
I have an 98cm inseam, total height of 191cm. I was on 185mm cranks, 180s, 175s, 170s, 172,5s and recently on 177,5mm cranks. I was constantly fidling with my position, especially seat height. Now I thought, I might just give it a try and install 165s. They feel way more comfortable when riding. As if the whole fit is more "relaxed". No more fidling. Let's see how it will turn out in the long term.
i have 96 cm inseam and 170 mm is shortest i go, cant get any power out if they are shorter
Any updated on long term feel?
I have a super short (730mm) inseam at 178cm height but am built for short neuromuscular efforts. I have good mobility and don't have the spare tire around the gut - what would be my best call?
165mm cranks allowed me to ride all day vs an hour or two due to back pain pain from my herniated L4-L5 and L5-S1 discs.
I also have hernia’s L2-L3 L4-L5 I am 185cm tall and have 175mm crank and when riding my bike the backpain is getting worse.howe tall ar you?maybe i get the 170 mm or 165mm crank
I'm using a 172.5mm on my outdoor race bike, and 165cm on my track bike. Initially I set my saddle on my track bike on the same height (measured from the center of the BB) compared to my outdoor bike. But recently I put my saddle 7.5mm higher on my track bike, which allows me to stretch my legs/knees as much as on the race bike. Does that makes sense? Or should I keep the distance saddle-BBcenter as common reference?
I love shorter cranks. I switched from 175mm to 170mm for this year road season and Iam 6foot4 and they are amazing for me. For solo breakaways in road race they are amazing. I can ride in fully aero position on a road bike for hours and hours witch has masive aero benefits for me. Thanks for amazing video as always, guys. PS: love "eaglebeak" saddle :)
Did the same a few years ago and I just feel much faster with 170. I don't know if I am really faster, but the psychology probably does lead to some performance improvements!
I am 6'2 and currently have 175mm and today (before watching this video) bought 165mm. Looking forward to seeing how it works out for me.
@@entdmIIhow did it go? I’m 6’2 as well and considering this change
@@entdmIIalso considering this- any feedback?
@@faustinoeldelbarrio8967 Sorry - just seeing this. I decided to go to 170mm as I was concerned that 165mm could be too aggressive of a change. So far though, I am very satisfied with the change and feel like I can more easily peddle faster, which for me was my primary goal.
My Gravel bike came with GRX 172,5 cranks from the manufacturer. At longer rides I feel very uncomfortable knee pain which I didn’t experience with my trekking bike with 170 cranks. Unfortunately, the smallest GRX 600 cranks available are 170s. Do you think going down by 2,5 mm from 172.5 to 170 will produce a noticeable difference for the costs? I am 178 cm tall with long legs and an 87 cm inseam. Or can you recommend any cranks other than from the Shimano GRX 600 series that are available with shorter cranks and would be compatible with a a GRX 810/600 2x11 set?
Love that beautiful looking saddle in the background! Just gone to an SMP Nymber - love it!
Could you talk about the effect of crank length and the relationship of the knee angle at TDC and BDC. I’m 77 and use 165 cranks with old degenerative knee issues. My gravel bike has 170 cranks and my knees get sore after a longish 1-2 hr ride but not on the 165,s.
The most important thing is to make sure your leg is exactly level or slightly under horizontal when your pedal is at it's maximum height. That's what I have found out from my 5,000 miles cycling since the capitalism 2019 bug.
I'm 2,02m. I'm more of a lower cadence rider. My muscles can put high force over a long time, but as soon as I go for high cadence they start burning super fast. On my older MTB I have 180mm shimano deore cranks, from the time where shimano had a series for taller riders. Everytime I step from my road bike (175mm) to my MTB, the crank length feels so much better, but I still feel, like it isn't enough. Therefore I have been playing with the thought of getting cranks manufactured. That would be a lot of money. So, how do I know if it's a good idea or not and for what length should I look? How can I calculate that to at least get an estimate?
I've got major hip flexion issues AND a fair bit of soft tissue opposition. When I do a the knee to the chest test I get to about 45 degrees and both the hip and the sunken chest tell me that's enough of that rubbish.
165s are the bomb! And I’m average height. I went from 172.5mm and tried 165s because I had some old cranks from a vintage bike project I had lying around. Wow! I noticed a 3 watt increase in power on a long climb I do on occasion. Maybe it was placebo. I don’t know. We might be onto something with these short cranks. Maybe we can even go shorter and get more power!
3 watt?!😂 Really meaningful
Pogacar switch to 165 mm in the last strade bianchi and he did a overwhelming win! I don’t think that it was placebo! Haha
Thanks for the interesting content, you have been advocating shorter cranks for a while and I understand the advantages. But aren't there advantages and good arguments for longer cranks, as well?? Especially for taller people (like 1.95m tall and 96cm inseam)?
Ich habe ähnlich lange Beine und hatte deshalb "früher" auch mit 185ern experimentiert. Bei denen hatte ich das Gefühl, dass ich mit "Drehmoment" fahren kann, und dass die Arbeit über einen größeren Anteil des Muskels verteilt wird. Problem war, dass ich immer das Gefühl hatte, dass ich die Sitzposition nicht richtig eingestellt bekam. Und: je aggressiver der Oberkörperwinkel, desto unwohler wird man sich fühlen. Kurz: je länger die Kurbel, desto mehr steigt die Anforderung an die eigene Beweglichkeit und an eine wirklich gute Position.
@@c.thiele1588 Thanks for sharing, replying in English so everyone can follow. Torque comes from force and lever, so with less force you can produce more torque if you increase lever - which I can see can help some riders. Downside, you mention: wider movement range, possibly more difficult to adjust seat position or get into aero positions. My main interest: the bottom area of the stroke with long legs - how can that be tuned best?
there was no mention of tall riders. my saddle height is 825mm, and i use 175mm crank, is that ideal or should i try shorter?
I did a fitting recently. Im 178cm tall and was given a seat height if 715mm and 165mm cranks. Im assuming that Cam and myself have the same "short leg issue" and I too have a minor hip impingement and he'd have about the same saddle height as myself. (His falath Evo is setup almost identical to mine.)
How tall are you Neil to have a "regular" seat height of 750mm+?
Im starting to feel like a smurf.
So you're saying myself as a 60kg 5'7" bloke (seat height at ~675mm) with a tendency for riding at high cadence I should really be thinking about 165mm cranks rather than the 172.5mm (that came on the secondhand bike). My summer bike has 170mm cranks and i can't say I notice any difference.
I've seen other fitters discuss this exact scenario and they usually say they wouldn't bother with any change less than 5mm. Most people won't perceive any difference with 2.5mm and the change in hip angle and other potential benefits likely wouldn't be worth the cost and effort.
Do you adjust the seat according to mm from the crank change? If I go from 175 to 170, do I have to up my seat by 5mm??
I have 688mm seat height to bottom bracket, and hip impingement currently running 170mm. Would 165mm be better for me?
Any changes needed to the chainring size after adjusting the crank size?
Go by percentages, a crank that’s 10% shorter ‘requires’ gearing that is 10% lower but if you’re only dropping down 5mm, the percentage is tiny (less than 3%) so you’d barely notice the the effective gearing change.
At which height or leg length would bike fitters concede 175mm would be for them? If a rider has an inseam of say nearly a metre i'm guessing 175mm comes into play.
Thanks for sharing! I'm around 172cm tall. Would using a 165mm crank help me (or anyone my height) climb efficiently on ascents with an average gradient of 5% and max of 22%? Thanks in advance
Buy a cheap 165mm crank and try it. Without trying, it is just a guess - 172cm with long legs is very different from that height with short legs.
Crank length change in 2 bikes for me this year. TT 165 from 170 (recently tried 155mm but didn’t like the loss of torque) & road bike 170 from 175mm.
6ft 1 inch, 73kgs reasonable mobility but I am aging….hit 42 later this year 😢
You can change gears and get the torque back... You lose horsepower which is the "over time" portion of the equation. Short cranks don't make your muscles weaker
Did you notice an improvement ?
@@Gk9311cadence up 2-3 rpm immediately. Otherwise too early to tell really.
@GazRadCycling I have the same height, but ~ 10kg heavier. Seriously considering getting to 170 from 175. I am mostly doing long distance riding.
@@Gk9311actually I don’t see any drawback as to why you shouldn’t go for especially if you’re on the lower end of the cadence schedule currently. I plan to do a couple of videos on my channel on both bikes that have made changes this year as also gone narrower on bars too following expert bike fitter advice
im 5'4" height..what is the recommended Crank Length
Thankzz🥰
I went from 175 to 165 on my mtb and all the reasons were correct...hip issues disappeared completely...my sports physician couldn't fix it but my bike fitter did
Howe tall are you,Will also go from 175mm to 165mm crank have lower back pain and hip.
I am 185cm tall
@@davychristiaens6421 1.8m
And less pedal strikes as a bonus
I have a stride length of 100cm and since I've been using 180mm cranks I've had significantly fewer problems with my knees - I think there's too much talk about short cyclists - or short-legged people - but from 90cm it gets really long and I'm only 190cm tall There are a lot of great people out there...
Tried 150mm cranks and immediately went back to 170mm because i missed the laverage they gave me on climbs. Climbing the same hill felt much more harder on my squads.
I'm 165cm
Adam Hansen - used 180mm cranks (max allowed?) at 1.86m/6'1" tall. Crazy handlebar drop/extension, and record for most consecutive Grand Tours.
(I only bring this up for shits and giggles)
Seat goes down with longer cranks and up with shorter so that doesn't make it more. You are right he had crazy The seat drop and stem length and saddle-to-bar and a very forward biased position.
This topic gets me going all the time... pretty much every pro is on 172.5s even Pozzovivo at 5'4" is on 170s..... Everyone on this thread is going down to 160s and feeling great...wtf... Is this just a bunch of fat weekend warriors commenting🤷
how are you measuring seat height? From the middle of the bottom bracket to the top of seat? I am 170 cm height / 75 cm inseam. what crank length do you recommend? 155mm? currently on 172mm with some knee pain from motorcycle accident.
Saddle height is usually measured from the center of the bottom bracket to the very top of the saddle, ideally at where you sit.
You can try 165 mm on a fit bike with variable crankarm length adjustment during a bike fit first, see how it feels.
I stand at 165 cm with a 77.8 cm inseam and never had any issues with 165 mm crankarms.
I'm not that short. at least I don't think i am. 170cm with short legs and went down 160mm cranks and it's been a gamechanger.
Insightful analysis. But gosh, the old standby, 170mm, is right between 175 and 165. How about that?
There is no single number - it all depends on your height and flexibility and leg proportions.
Trouble is 170mm might be right in the middle, however if you are short or very short right in the middle is hopeless. If like me 5'4" on a good day a XS or XXS bike very often comes with right in the middle 170mm cranks . If you go on crank length calculator website comes out my crank length ideal is 140mm or 155mm depending on the crank calculator. 170mm for a short or very short person is a utter disaster. I imagine 170mm for someone very tall over 6'6" might be equally disappointed?
Bike manufacturers, or more so crank manufacturers need to wake up and fit short cranks to their XXS bikes for everything to be in proportion? Short stem , narrow bars , short top and seat tubes ,sometimes smaller 650b wheels also need short cranks to match .
@@robduncan599True. Sticking to 170mm pretty much ignores the issue! I rode 172mm once, commonly used on mountain bikes, and could never get my spin down, trained on years of 170mm. I'm 5'8" as fairly standard height.
I'd love to know if Neil finds climbing a bit tougher on short cranks because of lower torque = more leg force. How pronounced is this? I'm considering going from 170 to 165mms
Yeah where cadence speed is not guaranteed , more torque should be necessary to spin a crank. Love my 165 crank but very difficult for long distance N high gradient climbing. But it’s really good for flat or rolling hills
@@Aiden.Kas someone who went from 170 to 165 this is false
My inseam is 71cm, but it is difficult to purchase cranks smaller than 165mm on the market. Even that is very expensive and cannot be used.
The problem we all have , if you need anything less than 165mm . You would think crank manufacturers would have cottoned on by now ? I'm sure the Chinese will step in since the rest are so hopeless.
I am currently on 165mm cranks on my full carbon bike ultegra, but still way to big for me , 5'4" . My hack bike has 140mm from a generic folding bike 140mm is about right ,possibly 145mm or 150mm but as you say almost impossible without big experience and hassle.
I brought a bike which was on sale. I thought if I could stand over it, with my feet flat on the floor without the top tube touching my crotch or feel that my crotch was sat hard on the top tube, then I would buy the bike. It tucked the crotch test so I brought the bike. I'm a short guy at just 5 foot four with a 29 inch inside leg. My thighs are shorter than my knee to the bottom of my foot. Anyway I knew that I can increase the saddle height by adjusting the pole the saddle sits on. The handle bars were a little too long for me but I could always scoot forward on the saddle or move the saddle a bit towards the handlebars. Anyway after buying the bike I adapted to the longer reach OK. But half way through the ride I experience this shooting pain in front of my left knee to the point I could not peddle any further I said to my friend I can't go on. I could walk but not ride. He went home on his bike and he came back in his car and drove me and the bike home. Anyway I came across an article on you tube which talked about shorter cranks. I knew I had to bite the bullet and get me a set off new cranks. It was a pain looking for Trigra 4700 all the cranks of 165mm were not in stock. But I managed to find a set. Long story short. What a revelation. Money well spent and that meant my cheap domane 4 was not so cheap anymore
I’m pretty sure we have it all wrong and that riders with longer feet should actually ride shorter cranks. Sort of like saddle width, smaller riders normally go for 155mm and larger blokes tend to settle on a 145mm seat
What would you consider "shorter cranks"? E.g. I'm using 175's currently and think of switching to 170 due to the hip flexibility. I'm 1.91m, 77kg (sorry metric ;)
move saddle forward.
Could someone explain the measurements of saddle height he refers to?
Yes he is saying the average height in the west is around 175 ish so those people with an average inseam usually are based around a saddle height from centre of BB of around 73-74 cms...
Seat height is 690 using 160 cranks, love them!
Had this topic on my plate for quite some time and got my new bike with 165mm half a year ago. Went to a bike fit a week ago and was told after 5min that I apparently need even shorter ones and was sent home. Currently waiting for 155mm ones to arrive. I am very curious how the 155mm will feel.
I tried that length out on a fit bike, you get more clearance between your torso and thighs, so there's less disturbance when you're riding in a tucked position. Your hips also feel like they're "opened" up too.
@@yonglingng5640Installed them last week on my bike and you are absolutly right. The first rides felt amazing. First time in my life pedaaling feels "round" and not limited in any way
What I find amazing is how bad the LBS is at fitting a bike to someone. They sell someone a bike that is clearly not fit properly to the rider. The rider has a few rides and stops due to poor fit. You could spend 3K on a poorly fit bike and then only ride a few times then ditch it. I think anyone who is serious about riding should be fit BEFORE buying a bike. Go to a real fitter. Get set up on a fit bike. Get all these parameters down first, then get the bike that fits you properly. It will save you thousands of dollars, a whole bunch of pain, and you will be much happier! This guy is phenomenal!
Exactly. Almost all customers I've come across never had a preliminary bike fit on a fit bike, they just pick a bike based on what they lust over. There was one time I had a customer asking if I could switch his new bike's cockpit to a one-piece counterpart, but the thing is, he's completely new to this bike and has never had a bike fit on a fit bike based on its geometry, so I had to decline the request (and also explain why) since I don't yet know what cockpit dimensions suit him.
I could not comfortably use the drops on my new bike until I went down to 165s. Game changer
What was your previous crankarm length?
@@yonglingng5640- 170
@@yonglingng5640 bike came with 172.5 and I downgraded to 170, which only helped a little. Going down to 165 made it much more comfortable.
I’m 185.42cm but have long legs at 91.44cm what crank length would you suggest for me q
very insightfull vid! but I don't realy understand how you think a 'non-powerfull-high-leggspeed-rider' will have benifit from shorter cranks. I do thing it is actually the opposite.
If you have good legspeed you won't have to much touble (neuromusculair) to ride high cadance with somewhat longer cranks (when no biomechanical limitations). the distance you foot is travling is longer than with shorter cranks so the speed you have to develope to ride the same cadance is higher with longer cranks. the benifit with the longer cranck is that you don't have to push that hard because you have greater lever.
the opposite: going to shorter cranks you will have less biomechanical issues because you will have to develop less leg speed to accive the same RPM. but next to that you will have to create more force to create the same momentum with this shorter lever.
this also might explain why you have trouble answering an acceleretion with you shirt cranck setup.
hope you fount this note interesting!
have a good day!
vocsnor
Anybody get numb feet after they’ve stopped cycling? Could it be one specific thing or is it like opening a can of worms trying to narrow it down. A bike fit is on the agenda but I’m a month or 2 away from being in a position to get one. Cheers for any replies in advance
The main disadvantage is that you have to raise your saddle. So you have to bend down more. I recently swapped from 175 to 172.5 and reached the limit of my neck flexibility by raising the saddle by 2.5 mm. Results: neck pain, tense shoulders, back pain, numb hands, numb feet, hurting bum. And a bit higher cadence overall, but at the expense of bad fitting gears (either too high or too low cadences for my taste and body). So back I am to 175. - Much better is losing some fat from the safety tire, especially the visceral fat. Hip flex gets easier, breathing is much improved, heart rate goes down. Lost 4 kg, heart rate down by 5 to 6 beats. (I’m 1.88cm/6"2', 100kg, saddle height 800 mm, more grinder than spinner - if all that’s of interest to anybody.)
I have long legs and a short torso so shorter cranks artificially put the seat higher and further back, which makes reach even more challenging.
May be a silly question, but did you try raising the bars by the same amount to keep the saddle to bar drop the same?
@@Lemond75 Not a silly question, but the handlebar is already as high as it can get. Otherwise that sure should solve it.
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But this is how to be more aero. Otherwise you can also raise your cockpit the same bit to compensate
@RCA just ordered some G8 insoles after watching your videos 😁🚴♂️
Why shorten cranks? Is it simple? I do not think so..
According to physic the torque required to drive the bike working on the circle equals power * power radius length.
So when crank length is shortened to get the same torque the power must be higher - power means your muscles in this case.
It means you will have to reduce gearing when uphill - sometimes push the bike if torque you can generate is not enough.
You can change front gears for smaller but in the result you will get less efficient and slower machine - you must work on higher cadence all the time.
Yest you can ride like that but everybody has limited cadence value.
Of course for someone who has short legs shorter crank is better but the reason is pedaling kinematics - range of work of knee and hip joints changes a lot.
so finding the optimal crank length depends from individual rider features.