Old 10-05-19, 06:02 AM
  #3  
JohnDThompson 
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Track frames designed to be ridden on a banked velodrome have fairly high bottom brackets to prevent pedal strike. If this is a converted road frame, the bottom bracket may be lower than that on a true track frame, so shorter cranks will help prevent pedal strike. Shorter crank arms are also easier on your knees at high RPMs; something that becomes significant on a fixed gear riding downhill or with a tailwind.

I run 170mm arms on my road bikes and 165mm arms on my fixed gear bikes and really don't notice any difference in power or leverage.
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