Why Does Stem Length Matter? | Ask GMBN Tech 285
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- čas přidán 11. 06. 2024
- Welcome back to another episode of Ask GMBN Tech, where we try to answer all your complex, scary, niche, and technical questions about mountain bikes and MTB-related tech!
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⏱️ Timestamps ⏱️
00:00 - Welcome Back To Another Ask GMBN Tech!
00:43 - Can You Switch From A 32t Chainring To A 30t Chainring On My SRAM T-Type Transmission?
02:03 - Does A 10mm Reduction In Stem Length Make A Difference?
04:08 - Can You Use SRAM GX Jockey Wheels On An NX Derailleur?
05:59 - How To Work Out Chainline On A 1x Drivetrain
07:53 - What To Consider When Pressing An Alloy BB Into A Carbon Frame
10:32 - What Are The Most Important Things To Check On Your Bike Before Riding A Jump Line?
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Can you use a Shimano Cues 11 speed cassette with an M8000 XT derailleur/shifter?
Cheers Owen. It has made a massive difference changing stem length. I felt like my Levo was throwing me forward, so I put a Burgtec stem reducing the length by 10mm but also replaced my stock handlebars with the Ride High 50mm bar. I feel so more planted on the bike & more in control.
Glad to help - I mean we're literally here to help - so please do keep the questions coming - cheers
Thanks Owen, great info as always! I swear by SRAM's tire pressure calculator, but had no idea that they had something similar for chain length.
Glad to be of help!
Otimas informações. Como sempre!
My wife’s always told me a need a bigger stem A thought she was talking about something else Now I know Thanks Blake
After riding my new bike with a 42.5mm stem for a month, I decided to change to a 35mm length stem.
It feels much more responsive now and feels more balanced for my fit!
Wow 42.5mm was already hella short. It was probably the placebo affect.
@@joshuaallswang8016 i doubt it, i went 10 milimeters shorter on mine (can't remember the exact numbers) and the difference was quite big, it wasn't just more responsibe but i even felt like there was more feedback from the wheel, though it might be that there was more tolerance on my old stem if that's a thing.
@@joshuaallswang8016 honestly, the bike feels a bit too long for me to handle and steer. So I tried a slightly shorter new stem and moved a spacer on the headset by 5mm. That slight tweak just added some pep to the bike and I think it’s because it’s now closer to how the bike fits me! I guess it depends on your riding style on what your style your bike is and also how it fits you!
My bike has a 495 reach size large! I’m only 5’9” with a long wingspan. I even use a 50mm stem I had on a previous bike with a shorter reach. Was thinking about going shorter. But the bike feels perfect! Leaving it on my Meta AM!
If it feel perfect stick to it!
Numbers don't matter when feeling speaks, keep what works for you
I’m 5’9 with a 6’0 wingspan and I feel perfect on a 450 reach 32mm stem
@@64x83 my last bike had a 450mm reach and 75 STA that’s why had the 50mm stem. I also have a 6’ wingspan. I recommend sizing up on your next bike. It will feel even better. Especially with a steep seat tube angle. My bike has 78.5 STA that’s why the reach doesn’t feel has big as the numbers suggest.
@@64x83 your arms aren't wings
I have just changed my stem from 50mm to 40mm it's a massive difference! Think it depends on the stem aswell the design, I know it's exactly the same length but it doesn't seem to feel that way! I got the new V2 Funn Equaliser 40mm stem for my brand new cube stereo it needed it for me and also added Burgtec high rise 38s feels like a totally different bike now but for the better! The carbon bars on it were just to low with 27.5 wheels but the Funn stem can be used 2 ways, i can turn it round for a higher rise aswell so this is what I mean by it depends on your stem as a standard stem won't have as much of a rise as your new one so just look at your rise numbers long with the length
Thanks owen for answering my question
The bike is a second hand focus Whistler (2016) i bought as a spare/project bike, dont know spacing at the rear and it is square taper so cant change anything there also 5:59
I put some washers vehind the chain ring to improve the chain line but it is still not liking the lowest gears 😂 but hé it works
I also send this question and photos of the chain and chain line in the gmbn uploader
Greetings
the rear spacing - is easy to measure - with the wheel out - and even with an older school square taper BB theres room to adjust - Square taper bb's come in different axle lenght - so more measuring will be required but again - all sortable!
cheers
OwenBikeNerd
I put a 50mm stem on my bike formerly had a 35mm, feels so much better now. I’m 6ft with a 470 reach and long arm span for reference
470 seems a little short for your height and wingspan, that’s medium nowadays. Try a large 485+ in the future bro.
I'm 6'1 and my previous bike had a 470 reach and 50mm stem. I've now moved to an XL, 495 reach and the handling with a 35mm stem is much better in my opinion.
@@elijahwemyss4148 crazy how sizing differs from brand to brand. My large commencal Meta AM has a 495 reach and 1285 wheelbase! I’m only 5’9 but with a 6’ wingspan.
185cm, Canyon Strive L, 470mm reach and fits my like a glove. Stem 40mm.
@@joshuaallswang8016 It's hard to find a bike much larger than 485 reach. Do you have any suggestions?
My lady bike mechanic once said if you want to keep the bar high you need a long stem.
#askgmbntech
yea, i have an older mtb that had a long stem and i really hated it, sio i replaced it with a shorty and replaced my bar for a high riser...., which kinda does the job, however I remember oldskool bmx, where they had those bars with a crossbar for stability, howcomw arent they available for mtb....?
Some companies still make them, if you search for 'MX style handlebars'. The most likely reason that they aren't as common because a little bit of flex is preferred now 🤙
#AskGMBNTech, I took the chain off my T-type XX drive train to give it a good clean (usually clean it on the bike) I used a new split link to refit it, I wasn’t using my bike for a few days so put it away then When I was doing my usual pre ride stuff, running through the gears etc I noticed it was getting stuck around the third gear? Had closer a look and the top of the cage was hitting the cassette! I did a few micro adjusts but didn’t really make any difference, long story short I thought I had fixed it but ended up snapping the chain, decide to take a few links out as it was broken anyway and if the chain was shorter it would pull the cage down and miss the cassette, which worked? No idea why this happened? I check for chain stretch fairly regularly and it’s completely fine and use the correct split link etc. any idea why this happened or if anyone else has had this happen?
Did you check the derailleur placement marker was located correctly? If you've taken the rear axle out, when putting the rear wheel back in you need to make sure the derailleur is located correctly and the axle torqued correctly. This is what sets up the spacing between casette and cage.
#AskGMBNTech I have a question: I have a Pinion E12.1 Belt driven ebike.
How to I meassure belt allignment to the rear wheel. I took off the rear hub and it has many spacers on the DT Swiss hub. While taking it apart and putting it back together, I was not completely sure I have the rear belt perfectly alligned. Does it matter if it's a bit off?
Maybe I'll just ask Simplon.
#AskGMBNTech on my mondraker superfoxy carbon i have a headset cup wich opens the headtube angle by one degree, but the upper cup keeps on rotating from the correct orientation to make it work, how can i stop it?
#askgmbntech, Comparing gearings 24/36 and 34/50 - both giving about the same ratio - which one is more efficient? Cheers.
#askgmbntech - top tips for washing and re-proofing before putting away winter riding kit for the summer?
#askgmbntech I can never seem to get my chain clean. After meticulously cleaning my whole drive train with proper bike degreaser, and scrubbing with a chain cleaner device, i can wipe and wipe and wipe down my chain for ages with clean rags and the rags keep coming up with dark grease and muck. What am I doing wrong ?
Does anyone know what brand stem is shown at 2:18?
That's one of Canyon's in house components, the G5 stem! It can actually be bought without the rest of the bike 😉
Can anyone tell me if using a hairdryer to heat stickers for removal on carbon fiber is damaging
you'll be alright with a hairdryer :) We wouldn't recommend going any more industrial than that though!
If you're unsure don't go max heat and it should be fine, though you could try with a MTB cleaning product wich won't damage the frame if it doesn't fully work, otherwise elbow grease and a whole lotta rubbing should also do the job, though taking a lot more effort
My girl says my stem is long enough, and that the technique is more important! 😤
#AskGMBNTech I'm building a set of carbon Race Face Wheels with Onyx Vesper hubs. I have some titanium nipples that I can use, but I'm not sure if they're safe to use with carbon. Can I use them? If not, what should I use instead. I know I shouldn't use aluminum.
My man is running the bluetooth stem on the thumbnail
#AskGMBNTech Does aluminum mountain bike rims have a maximum psi they can handle, and does it get lower the older the rim gets? Is the maximum any higher or lower for Carbon wheels? I had a Maxxis Ardent Race blow off of my now permanently damaged WTB sti25 wheel, and it was right at the maximum stated on my Maxxis tire, which led me to believe either my pump's psi reading was inaccurate, or that my rim got weaker with age.
Almost guaranteed that your pressure gauge is inaccurate. Find the right pressures for you by riding, then use your gauge reading for future use. The gauge will stay accurate enough relative to itself.
The maximum psi stated on the sidewalls assumes the presence of inner tubes. Most riders who run tubeless inflate their tires FAR below the max.shown of the tire.
We all know whats next long reach and small wheels ultimate combo 😂😂
70mm stem on 14/20 inch tyres is just a trials bike XD
#AskGMBNTech Which is better for my RockShox Zeb ultimate Silicone or Teflon spray?
SRAM bearings in the derailleur jockey wheels are terrible.. Just get some superstar components or similar jockey wheels.
#askgmbntech
Is it possible to fit a 12s shimano cassette with 10t-45t with an XT RD SGS with a capacity of 10t-51t? Will it work?
#AskGMBNTech I'm a gadget man and I would love to get myself a Sram GX Eagle derailleur for wireless shifting but I have a full set of Deore XT gear on my bike. How 'wrong' would it be to use Sram GX deraileur and shifter with XT gear (cassette, chain, cranks, brake levers with i-spec II etc.). Whole GX set is out of the question, too pricey. And I also prefer gear ratios on XT cassette.
You'll need aftermarket jockey wheels but SRAMano has been a thing people have done it. First gen AXS doesn't have the nicest shifting feel and T Type isn't as snappy, so a SRAMano mix is literally the best of both worlds, all while being cheaper and more durable than both.
Did you mean 'These requests' rather than 'These asks' just requesting.
A shift lever might be a "brain" of shifting, but what's the price of genius when it operates an ALS-ed body with osteochondrosis? My bike ain't Stephen Hawking either.
Besides, the real brain is the one inside the helmet, not a mechanism strapped to the bars or a PCB wired to suspension.
#askgmbntech what’s happened to Isaac?
First :)
🥇
come on guys. you don't need to upload every day. you are just reuploading old videos basically or remaking them 7 times. we would all much prefer less uploads and more new content, which you do occasionally do
Just don’t watch them then!?
So?! I love when the upload daily!! DON'T WATCH?? 🤷
Is this a two year old troll 🧌🤷♂️👆
#AskGMBNTech Why do we use CO2 cartridges to fill our tyres, Since CO2 has a significantly higher solubility in rubber is it not detrimental to use it in tyres?
Why not use HPA (High Pressure Air)?
Do they use the CO2 cartridges because the manufacturing process is already there for air guns and its a cost thing?
Santa Cruz Tallboy V4 CC