Mountain Bike Geometry 101 | A Complete Guide To Geometry + How It Affects Your MTB
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- Äas pĆidĂĄn 2. 06. 2024
- We've put together this Geometry 101 to help you figure out everything to do with mountain bike geometry! There's plenty of complex and mis-understood terms, angles and measurements going around out there, so here's what you need to know and how it affects how your bike feels đ
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I feel so privileged that the Dodster has taken time out of his hair modelling career to explain MTB geometry to us!
I really am LAUGHING OUT LOUD
And imagine David Schwimmer is there with him.
His hair is as stiff as a porn stars micky.
19 minutes about geometry. Doddy and the team have outdone themselves!
Awesome!
Was it useful for you?
Absolutely useful. Added to my CZcams Favorites short list.
Yes!!!! I'm off to buy a new bike tomorrow, so it was
.brilliant to receive this important information
Beforehand !! THANKS GUYS!!! đ
top tube? you probably meant nutcracker.
lol
Hell yes
@@Shpektrometer and God help those with large undercarriage
LOL
I actually saw a bicycle brand called nutcracker and it had that written on the top tube :D
How about a video about different suspension linkages. Does the shock placement have any real difference?
For example Canyon Neuron 2019, AL vs CF. AL has bottom mounted shock, CF has top tube mounted.
This please!!
Horst four-point or four-bar rear suspension. Look up Turner bikes.
Merida/Centurion LRS and GT I-drive also was some interesting cookies.
Would be nice to see one retrospective about various soft-tails too.
Yeah that would be really cool. DW Link-Horst-VPP-all the other fun stuff out there. So many cool options these days...
Hi guys how about 26ers frame with 27.5 front fork and 27.5 wheel set?
Now I need a vid explaining all the different types of suspension linkage and how they behave (VPP, DW, DELTA, etc)
It's just diamond frame... there's one diamond. There are two triangles though.
đ€Ł
Yip yip yip yip, uhuh, uhuh.
If you count the welds as gussets then it could be considered a double blunt ended shallow cut diamond frame. Still, these guys are very entertaining and informative. I wouldn't have looked it up had they not made the mistake :)
OK - I think I figured it out by connecting the dots. You get 5 points on the side view of a "Double Diamond"frame - front and rear hubs, headtube junction, BB, and the seattube-toptube-seatstay junction.
The 1st diamond is the one we see clearly in metal - seatstays > toptube >downtube > chainstays.
The SECOND diamond in the "double-diamond" construction includes one line that doesn't exist in metal, but is critical to modern geometry. It goes like this: seattube > toptube > FORK LEGS > "missing link".
So there's the forward-leaning obvious frame diamond, and a second rear-leaning diamond with a missing bottom line that connects the front hub and BB. What? Ok so - imagine a Penny Farthing. Huge front wheel, tiny back wheel, and no chain - the pedals are mounted directly to the front hub. You can't draw that second diamond because there's only 4 total points. Later than the penny farthing you got bikes with equal wheel sizes, but still pedals directly on the front hub - no double diamond. It was only when someone moved the pedals out with the chain drive that we got the 5th point to connect and the modern bicycle. That invisible bottom line in the 2nd diamond is what makes bikes work the way it does, with stable rear for smooth power application and power disconnected from leading-wheel steering = nimble, controllable turns.
Not good when somebody wants to teach us about geometry, but does not know the difference between a triangle and a diamond. :-(
Best geometry explain ever!!
Make a video about fitting the mountain bike for really tall riders. In some countries it's not easy to find frames bigger than 21", which is not enough for guys >2m tall. There's no video like that on YT, so it will be great to hear some tips how to make 21" bike feels comfortable.
PS. Another great video. Great job guys đȘ
Absolute hero of an episode. We've all been waiting ever since that ask GMBN ep a few months ago
I've been waiting for a comprehensive video like this for so long. Thank you gmbn tech! I love the quick bike anatomy explanation at the beginning. Perfect video to send to friends when they ask about what effects certain measurements have, half the time I never even know myself haha.
THANK YOU! Great episode. After a near 25-year hiatus, I started mountain biking again. (Didnât realize how much Iâd missed it. Loving it.) As you can imagine, A LOT has changed; including terms used, varying types of MTBs, components, and more. This episode has provided me with clarity needed.
Thanks for this video, great and simple explanation about different parts of geometry, there's not that many good vids like this out there so definitely something that was needed.
Knowledge is a weapon.
GMBN..đ
I've been waiting for this video without knowing it! Really helpful to know the anticipated handling changes with changes in geometry.
This is outstanding, guys!
Top quality video, thank you!
Great video Doddy! Looking forward to the up coming info.
Probably one of if not the most helpful MTB vids Iâve seen. Keep up the great work guys!
You have made it so much easier for me to understand the dynamics that go into my bike. Thank you for the great information!
super informative and very clearly presented, big thumbs up!
Bravo! I've long wondered about most of this, and wasn't even aware of some of it. Fascinating stuff. And as others have said, an explanation of differences in suspension design would be most welcome too. Thanks for pulling this together.
Great video that takes some of the myths and headaches out of all the number crunching you seem to have to be able to do before committing to a certain size bike. Perfectly explained, great stuff!!
Brilliant video. One of the most helpful I've found for mountain bikes.
This was so helpful, I wondered what all these terms were and how to apply it to riding, now I can. Good speaker too.
Great video and information, Doddy! Of course, Iâll need to watch it a few times to let it sink in. đ
Excellent 101 start video with explanations! Provided new information for my understanding of current designs. Thank You!
Great video! Thanks for putting this one out. Looking forward to the ones coming up!
This is a FANTASTIC video! I learned SO MUCH! thank you for making it!
Iâve been riding for over 30 years and lâve learnt so much. Thanks. Brill explanation
Finally a step by step explanation. Most appreciated
love that park tool set up behind you! thanks for the vids!
You are a good teacher, I have learned more on bike than I have learnt my whole life, thanks you
Great job! This is exactly the kind of video I'm looking for. Thanks a lot!
Great video, looking forward to more videoâs as I am always interested in experimenting with different geometry depending on the trails / tracks that I ride both here in the U.K. and Espana!
Fantastic video, very helpful. Thank you!
Great video Doddy. Been biking for over 35 years and I can honestly say I learned a couple things. Well done sir
They should provide a range of numbers for each key geometry spec, and describe how those ranges change between riding style (XC, Trail, etc) and frame size (S, M, L, ...).
Great info and great way to show measurements. Helps alot when looking at a new bike for sizing or ordering a bike online. Thanks
Excellent video, for sure. I can't wait to see the others.
This is really helpful, thanks. I paused a lot and took notes. About to buy a new bike and the jargon blows my mind.
Some manufacturers like Trek, sometimes list geometry at 30% sag for full-suspension bikes. That makes sense, because on hardtail head angle steepens when you start pedalling in normal position, and on full-suspension it actually slackens. So why doesn't every manufacturer provide that info?
Very informative. Thx, Doddy!
GMBN has risen to the top of online MTB publications - just exceptional! Thanks!!
17:47 so actually when 29" started it was only 26 existing which usually had around 1.5inch=38mm fork offset. 29 usually had around 2inch=51mm fork offset. so then came 27.5 to split the difference in the middle and it usually had around 1.75inch=44mm fork offset.
Clear simple vid doddy, great job. Clear graphics, well done to the doodler with white pen!
Brilliant explanation of mtb geometry, the best I've seen.
Thank you.
Very informative. Thanks!
Nice accurate info my dude!!!!! Yeap, and let me just say that trail angles can change how a bike feels almost more than a frame being a little too long or short. When I raced BMX I had an XL frame, but ran with a fork that had the axle at the bottom centre of the fork tubes, not in front. So I had better stability in the frame with quick steering! Got me a trophy at Bexhill back in the day! đ
Thank you - excellent explanation, so clear and easy to follow.
Thank you! Easy to understand and good information.
Thanks for the useful info Doddy
Love it, well explained, lovely animations,explanations.đđ
love this..Answered alot of question about modern geometry
this channel is so amazing, thx guys!!
Phenomenal video! Thanks!
Thanks Doddy, this is fantastic to know and really well explained
Really help full video thank you for explaining the confusing nomenclature easily.
Great informative video - well explained. Thanks
Very insightful and informative video. Thank you
I knew all this, but it really made me think about how hard it is to end up with the perfect combination.
Great information Thank You!
Superb Video .. Thanks a ton ..
Thanks for this, very informative, I have not measured myself up for a bike since the early 90's and things appear to have changed!
Brilliant! Thank you!
Great work Doddy. Finally I have a bit of an idea what the geometry of a bike is. Thanks.
Absolutely loved it đ€© thank you boys!! đ
Excellent video, cheers mate. đđ»
Great video, very informative, and explained a few things I didn't know, and confirmed a few I suspected.
I'd like to know some example of "average" and greater / lesser extremes of these dimensions in your next videos: what constitutes a short or long length or tight / wide angle for example.
Keep up the good work :)
GREAT info here ! Dod you rock !
This is the greatest informational mountain biking video ever made.
Thanks, Doddy, that was the best intro to geometry I've seen. Bookmarked.
VERY GOOOD!!! Thumps up!
I don't know how you make me listen to such a boring subject so intently. You have helped me as a beginner rider with so many of your videos, you and your team. Thank you! I ride a 2015 Diamondback SYNC'R with a 4" bar rise built up an old proflex 96 with a 1x10 as well as a 4"bar rise and I even got the wife out there with me an a 2018 GT aggressor with new hydraulic breaks bar riser pedals upgraded rotors mig shift 1x7 which when I get the money will become a 1x10 and I learned almost all I needed through this channel!!
Thanks guys and ride on!
I waited so long for a video like that! Now i finally understand what it could mean if you talk about some measurements in a bike check...
Thanks. That was awesome. Clear explanations of what the measurements are and how they affect the bike. Was always confused about what exactly offset and trail were.
We have an explanation of Low vs. High trail with relation to road and gravel bikes. czcams.com/video/L0Kt-c8fG3M/video.html
Brilliant, thanx.
Nice work, Doddy. Frame geometry- I especially like the explanations and name origins.
Nice vid! Been waiting for this.
An idea for a video could be the different stresses that each part takes and has to accommodate. Maybe another one about advances in or about experimental geometry.
Excellent explanation. Thank you.đ
Glad you liked it!
Really helpful video. Thing's became clearđ
Thanks for the informative video. I'm more of an urban rider than trails. But, this was very informative. Keep up the good work.
The video was very helpful, thank you.
As a carpenter, that has never got to use that laser level Christmas gift - I finally have a use for it đŹ
My 2008 Scott Genius has a nice high BB, especially when I threw a 160mm fork on it... I love its ride now
Outstanding Content, more Please!
Great video. Very informative đ
My new favorite video.. Well done folks..
Very comprehensive Doddy, nice one.
I really like the presenter, very clear and concise
Thank you Sir for this very informative video.
I still prefer to measure the bike by going by the length of the top tube not by the reach. When I am sitting it is supposed to be comfortable and while I am standing I am supposed to be agile and move around.
Pillokun I agree, but our opinion about geo might be seen as antiquated
@ Ride Alongside How do you pedal a bike? EET is very much relevant and should be the first measurement considered.
@@smalerider1727 I agree as well. It was a bit of a disservice of him to say ETT isn't really important. I feel it's more important than reach. Especially with these steep seat tube angle bikes, if they don't make the reach absolutely huge by old standards, the bike is way too short. It's all preferences and how you ride, but I ride in the saddle probably 80% of the time. It's hard to argue I should size the bike for only 20% of my ride, but that's the going advice these days...
Probably reach is more important for enduro/DH riders where you car about descending and not really on the seat pedaling... I kind of agree about ETT or TT measurement thought... it is probably the first impression if the bike is small or large. Stack is a good one! I never knew I loved a large stack just makes you feel more like in a BMX to me. Shame you are pedal strike prone
True, but you can adjust the seated length of the bike with Saddle adjustment, offset seapost and stem length but the standing reach (ie weight distribution between the wheels when standing) is set by the geometry.
Great vid
Excellent vid.
Nice video and very informativ, IÂŽm a XC rider, but is good to know that kind of information!!......I love your show, keep up like this and please include more videos and info about XC bikes and races!!!!.....(I`m a big fan of your show)
awesome video!
I came to your channel to search for orientation regarding a vintage bike called the Cannondale M800 Beast of the East. The Beastâs frame has a sloping top tube, a high bottom bracket and a very short seat tube. I guess that the next step is actually riding in one. I come from a Cannondale M400 which has a traditional top tube, with minor sloping. Later I purchased a used AMP Research B4 bike and upgraded the rear damper with Risse air and oil unit. But I never evolved to more expensive and modern bikes and long for this M800. Thanks for the clarification of the elements of the bike!
Great video again
Wow perfect video congrats
Great job!
I feel like I'm going to school and doddy is my teacher đ
izat samian and it is becoming my favorite class of the day! đ
Not that any of these measurements wouldn't make a difference to different riding disciplines, but how long ago did manufacture start advertising the engineers notes??? Seems like a mind boggling amount of different things to keep track of vs what your realistically thinking of when one would buy a new or used offroad motorcycle. In any case, I always appreciate a rather diligent effort to make info like this digestible. Top notch content!