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Pandacised
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172.5 road, 175 mtn, what for cross? I have some Ultegra 170's that came on a road bike that I could use, or I have some Bontrager 175's. What is the theory for crank length on a cross bike?
 

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well some would say

go shorter so you can spin more and have clearance on off cambers. others would say go long so you can have extra leverage.
me Road 177.5
MTB 175
Cross 175
had one bike that came with 172.5's and they felt funny to my long legs. If you are a spinner go short,masher go long
 

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atpjunkie said:
go shorter so you can spin more and have clearance on off cambers. others would say go long so you can have extra leverage.
me Road 177.5
MTB 175
Cross 175
had one bike that came with 172.5's and they felt funny to my long legs. If you are a spinner go short,masher go long
What he said.

Me:
track: 165
Road + Cross: 170
Mtn: 172.5

I gots me some short stumpy legs, so don't run long cranks.

M
 

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MING
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though my post count is infinitesimally smaller than the learned two above.

mtn 180
road 175
cross 172.5
cross bike while used for touring 175
 

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Hmmm....I run 170s on all of my bikes except I ran 165s on my fixie/track bike when I raced on the track. I just like 170s.
 

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I run the same length crank on my road and cross bikes (172.5). Changing crank lengths between bikes drives me nuts, particularly when I get on the bike with longer cranks. Obviously others don't mind, so you'll have to see what works for you.
 

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Just run whatever you're most used to. I run 172.5 on everything, except my fixed which is 170. Long cranks hurt my knees. I discovered this back in the day, when 175s came on all sized mtn bikes.
 
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