Hanginon wrote:
I am not a believer in the instant "Ah Ha" moment other's have commented on, but rather, a believer in how something feels after many miles and time in the saddle. Only then, IMHO, can you really pick up on ALL the subtle ramifications (good and bad) due to a change in position.
In my case, it was instantly noticeable. I have limited range of motion in my left leg from an old accident, and 170mm cranks are right at the very limit of what I can ride. 172.5s (which are what normally come stock on 54cm/mediums) are slightly outside my range, and painful to ride, even in an upright position (I can't quite get over the top of the stroke, and can just barely manage with 170s). Switching from 170s to 165s gave me a bit of breathing room. Comfort, plus a slightly flatter back, just by changing the crank and raising the saddle 5mm. My very first ride, I was faster and more comfortable...
"I'm thinking of a number between 1 and 10, and I don't know why!"