Standard Crank Length

JimboM

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

Chunkers1980

175

cooldad

But doubt you'd notice the difference.

rockmonkeysc

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

bennett_346

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.

The Rookie

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

omegas

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

chez_m356

omegas wrote:

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

certainly seems to be the case according to canyon and specialized geometry charts, 170's only appear on their small frames

cooldad

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

chez_m356

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

The Rookie

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

JimboM

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

floosy

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