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Old 01-03-2021, 07:51 PM
PolePosition PolePosition is offline
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Join Date: Nov 2020
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I have long legs & femurs. I can’t squat without spreading my feet very far apart. My quads would smash into my rib cage with 175mm and 170mm cranks. Switched to 155mm after my fitter read a Cobb article a number of years ago. I’ve been able to get into a much more aerodynamic position with no pain and without moving my knees to the sides to avoid my chest. Geometries are individual so YMMV!
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Old 03-27-2021, 04:46 AM
Gabe77 Gabe77 is offline
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Join Date: Mar 2021
Posts: 22
Watch the gearing when changing cranks

I've never heard anyone mentioning that your effective gearing ratio changes with crank length (except SheldonB). 165mm to 175mm is exactly the difference between a 53 and 50 chainring. Beware messing up your gearing ratio if compact/full crankset is an important factor for you. IE to switch from 175-165 and keep the same gearing you'd need to swap to a compact crankset.
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Old 04-07-2021, 02:26 PM
Pricci09 Pricci09 is offline
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Join Date: Dec 2020
Posts: 14
I recently switched from 172.5 to 170. Can't really notice a difference to be honest. I think with a change that small the body will naturally settle into what's comfortable by just sliding around the saddle a bit.

If I did it again I'd go straight to 165
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