S Sam New member Aug 27, 2009 #1 I have a 15 spd road bike, and I'm wondering if it's slower than a 21 spd. By slower, I mean less number of wheel revolutions when both the 21 and the 15 are set at the highest gear.
I have a 15 spd road bike, and I'm wondering if it's slower than a 21 spd. By slower, I mean less number of wheel revolutions when both the 21 and the 15 are set at the highest gear.
