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@Philip_J_Fry
After riding fixed 165 I switched my road cranks from 175 to 170mm. I found with the 175s I was locking out my knees on occasion and finding I was a bit cramped at the top of my stroke. My spinning didn't feel as fluid.
Still evaluating 170's, I'll need to tweak the seat and bar position, but it feels much more comfortable spinning on the roadie now.