I got to wondering recently (uh-oh) The accepted practice, IIRC, is to have a shorter crank for touring, say 165mm, and longer cranks for a strength event, say 175mm. Now "normal" is 170mm. I rode a Rambo a few weeks ago with 165mm and I cannot say I spun any faster or easier on the hills I encountered. And when one considers you are talking a 5mm difference (less than 1/4 inch), why would you? Do any of you really notice a difference in crank length? Or was my experience too short in time from me to notice anything.