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 26 vs. 27.5 vs. 29 
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Location: Ayer, Ma
Post 26 vs. 27.5 vs. 29
If I attempt a 3 foot drop on a 29er, is it actually a 3 foot drop? I was told it's not because my bigger wheels will hit the ground sooner than the two smaller wheel sizes. I was informed of this point the other day while riding with a guy named Bibshort. He rolls with 26 inch rims and he tried to explain to me that the same 3 foot drop is actually a 3 1/2 foot drop on his 26 inch wheels. He explained that you only get a true measurement of a drop when rolling on 27.5's.

Can an engineer or someone knowledgable weigh in on this?

I'm lost

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Sat Feb 09, 2013 9:14 am
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Location: DANVERS, MA
Post Re: 26 vs. 27.5 vs. 29
It's your boy bibshort that is lost.
A three foot drop is a three foot drop no matter what you do it on.
If your bottom bracket height is 14" and you leave a wall 36" then you personally leave at 50"
Your distance to the ground/bottom of your tires is constant.
When you land 36" down your bottom bracket is still at 14" and you have dropped 36"

Maybe bibshort has one of those magic bikes that turns a 4 foot drop into an 8 footer
See those on here all the time


Sat Feb 09, 2013 10:53 am
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Post Re: 26 vs. 27.5 vs. 29
Bib's is close to right. His 3' drop thats actually a 3.5' drop is really a 5' drop,once you figure in the hole he makes when his fat-ass hits the ground.


Sat Feb 09, 2013 1:53 pm
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Post Re: 26 vs. 27.5 vs. 29
I think I understand most of what you said Milke, but what if Bibshort is running 40% sag and he rides a progressive travel rig...........does the handlebar height make a difference compared to the bottom bracket height at takeoff? He's an engineer so he is talking a foreign language when he starts talking about drag coefficents, preload force, and take-off angles..............I dunno.

I just want some ammo so I can tell him he's f'n lost.........that is, if he's f'n lost.

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"If you build it and tell everyone about it, they'll tell everyone about it, and it'll be ruined." Quoted by a local trainbuilder


Sat Feb 09, 2013 8:50 pm
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Post Re: 26 vs. 27.5 vs. 29
Should we make excel spreadsheet for this? We then can capture all said specs and make an educated decision on this. We can't forget to add air pressure into the jackazzligrithm.

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Sun Feb 10, 2013 7:39 am
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Post Re: 26 vs. 27.5 vs. 29
you're all wrong. Drops are measured from the height of your seat. That's why only weinerheads lower their seats.

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Sun Feb 10, 2013 12:39 pm
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Post Re: 26 vs. 27.5 vs. 29
Wait, how does this affect my climbs? What do i need for them to feel shorter?


Sun Feb 10, 2013 10:34 pm
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Post Re: 26 vs. 27.5 vs. 29
bryco8 wrote:
Wait, how does this affect my climbs? What do i need for them to feel shorter?



again, the answer is raising your seat. The higher up you carry your center of gravity, the less vertical distance your CofG has to travel. A few inches can shave seconds off. It's important to remember to squat down low at the top of the climb, otherwise there is no net reduction in C of G distance traveled.

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Mon Feb 11, 2013 9:04 pm
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Post Re: 26 vs. 27.5 vs. 29
Hmmmm...Mavis I think you're on to sumfin...but we probably should measure a drop by the height of your melon instead. Shoot if I had a 29er I'd be up in the clouds even more! :lol:

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Mon Feb 11, 2013 10:35 pm
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Post Re: 26 vs. 27.5 vs. 29
i know im new to the site but , in my opinion most exagerrate the actual height of a drop ....how many times a buddy, friend or other rider say hey i just did this 6 ft drop ..and it really a lot less .

what im getting at is everyone is going to have a different mindset of this topic . me i think if its 4 ft drop its same on 26, 650b and 29er if you get technical down to the inch yes seat height ect , but bottom of wheels is bottom of wheels on any bike

by the way guys snow sucks .....all this talk of drops makes me wanna go ride !!!


Andrew


Tue Feb 12, 2013 7:57 am
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Post Re: 26 vs. 27.5 vs. 29
I get it guys, but if Stork hucks the drop on his 650b's and Mavis scrubs it with his taco'd 26's, wouldn't Stork 'make' the drop bigger............that is, if he left his 26 inch seatpost extended?

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Tue Feb 12, 2013 10:51 am
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Post Re: 26 vs. 27.5 vs. 29
antmav wrote:
I get it guys, but if Stork hucks the drop on his 650b's and Mavis scrubs it with his taco'd 26's, wouldn't Stork 'make' the drop bigger............that is, if he left his 26 inch seatpost extended?



depends on where the flat spot on my wheel is when I leave the ground and land.

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Tue Feb 12, 2013 8:14 pm
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Post Re: 26 vs. 27.5 vs. 29
Ok...so what happens if I can tell a story like a fisherman about hittin this 6ft drop sporting 650b's, on a 430mm post, 0 degree kore faucet... and all while on my ol skool low bb and saggy FSR? Is it ±?

:drinking:

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Tue Feb 12, 2013 9:07 pm
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Post Re: 26 vs. 27.5 vs. 29
Well Storkie, you just added another column to the mathematicalization equationization table. Drop size will depend upon if you are running 24 inch hoops on yer old Specialized rig.

:crazyeyes:

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"If you build it and tell everyone about it, they'll tell everyone about it, and it'll be ruined." Quoted by a local trainbuilder


Wed Feb 13, 2013 4:44 pm
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Post Re: 26 vs. 27.5 vs. 29
OK, your length and rise stem does not matter. Rocking the specialized FSR with the 24" rear wheel detracts from the total vertical footage you can claim on your drop.


Riding a bike with different wheel sizes front and back is like trying to make babies with one testicle.

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Wed Feb 13, 2013 7:31 pm
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