Inches and gears are unimportant to me. Keeping a 90 rpm cadence at my current Zone 4 (Threshold) is all that matters, because it's hard, yet comfortable enough for several hours, which is how I ride. If I see the watts go up while the cadence goes down, or the watts go down while the cadence goes up, then I change gears accordingly. 50-34 and 11-32, and I use 'em all.