Standard Crank Length

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JimboM
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Standard Crank Length

Postby JimboM » Mon Nov 12, 2012 22:46 pm

Need a crank for a new build but don't know what length to get, either 170mm or 175mm. I know it's a bit like 'how long is a piece of string' but what would be the standard on a medium size frame for a rider with 31" inseam?

Thanks
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Chunkers1980
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Re: Standard Crank Length

Postby Chunkers1980 » Mon Nov 12, 2012 22:50 pm

175

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cooldad
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Re: Standard Crank Length

Postby cooldad » Mon Nov 12, 2012 23:19 pm

But doubt you'd notice the difference.
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RockmonkeySC
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Re: Standard Crank Length

Postby RockmonkeySC » Tue Nov 13, 2012 19:35 pm

I have 170mm on one bike & 175mm on another, I can't tell the difference. Buy whichever is doscounted

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bennett_346
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Re: Standard Crank Length

Postby bennett_346 » Tue Nov 13, 2012 20:54 pm

I have 175 on one bike and 170 on the other, and i can tell the difference. And this was before i saw it was 170.

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The Rookie
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Re: Standard Crank Length

Postby The Rookie » Tue Nov 13, 2012 22:10 pm

I had 170's on one and 175's on another for a while and couldn't tell the difference either....

omegas
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Re: Standard Crank Length

Postby omegas » Tue Nov 13, 2012 22:19 pm

170 cranks fit well with small frames to give a bit more clearance ,its not about how they feel :lol:

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chez_m356
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Re: Standard Crank Length

Postby chez_m356 » Tue Nov 13, 2012 22:48 pm

omegas wrote:170 cranks fit well with small frames to give a bit more clearance ,its not about how they feel :lol:

certainly seems to be the case according to canyon and specialized geometry charts, 170's only appear on their small frames
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cooldad
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Re: Standard Crank Length

Postby cooldad » Tue Nov 13, 2012 22:49 pm

That's nonsense really as BB height is normally the same.
More likely the assumption is little legs.
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chez_m356
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Re: Standard Crank Length

Postby chez_m356 » Tue Nov 13, 2012 23:17 pm

cooldad wrote:That's nonsense really as BB height is normally the same.
More likely the assumption is little legs.

i would imagine little most things on a small frame :D
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The Rookie
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Re: Standard Crank Length

Postby The Rookie » Wed Nov 14, 2012 05:58 am

I agree, the ;logic is that shorter legs need shorted cranks to keep knee operating angles similar.

JimboM
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Re: Standard Crank Length

Postby JimboM » Wed Nov 14, 2012 13:54 pm

Thanks guys, think I might just give 170mm a go - if for no other reason than it may help reduce pedal strikes
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floosy
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Re: Standard Crank Length

Postby floosy » Fri Nov 16, 2012 20:15 pm

I have 155 cranks and can tell the difference between them and the std 170 on a small frame...


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