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Crank arm length for 28inch inseam?

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Crank arm length for 28inch inseam?

Old 05-01-17, 02:45 AM
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Crank arm length for 28inch inseam?

Hi! I have a 49cm 2014 Bianchi Volpe and I'd like to try out shorter crank arms. I'm finding myself shoving my seat as far forward as it goes, and even at the proper seat height my knee still comes too far up at the top of the stroke, and my knee is still behind the pedal spindle when the pedals are at 3'oclock and 6'oclock (if 12'oclock is vertical).

It comes with FSA Vero triple 50/39/30, I'm not sure what crank arm length. It's in the shop now getting V-brakes instead of the crummy cantilevers it came with, so I can't measure it myself. I'm 5'2" with a 28inch inseam. Any recommendations?
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Old 05-01-17, 05:38 AM
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Are you using the right saddle height?
(The commonly available) Crank lengths are quite similar, and don't have a huge influence on bike fit and is unlikely to solve such a pronounced problem.
Don't think you need to take KOPS too seriously, see here:The Myth of K.O.P.S.

Or maybe you have the bar too far forward for your particular proportions and range of motion.
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Old 05-01-17, 06:36 AM
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My recommendation based on a 28" inseam is to try some 152mm (6") cranks.

Not really available in shops but this guy will make some/sell some to you.

Short Bicycle Cranks

If you really like spinning at a high cadence you could even go shorter to 140mm.

I agree that KOPS isn't the be all and end all but still with a 28" inseam you would do well to try some shorter cranks.
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Old 05-03-17, 03:05 PM
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It sounds to me like your seat is too low.

What do you mean by 'inseam'? Bicycling inseam is from the bottom of the pubic bone to the floor, standing straight - search web on 'measure cycling inseam' (no quotes) or just go to https://www.competitivecyclist.com/S...e.jsp#measures.
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