[quote=Guy]Internet Fit Advice ShartQ: I’ve been having a recurring problem in one of my knees. On occasion, I get a sharp pain in my left knee under load (behind the lower part of the kneecap, specifically) in the first 15-20 minutes of a ride. The pain mostly dissipates quickly and doesn’t recur strongly as long as I don’t mash carelessly. Overwhelmingly, it occurs on a bike with 175mm cranks. The others in the fleet are 170/172.5.
The SQ: has anyone else experienced knee problems or other noticeable issues due to a minor difference (175 vs. 172.5) in crank length? I’m 5’11" but with stubby 30"-inseam legs. Do I replace the crankset with a shorter one or is it more likely that this is being caused by another fit-related variable?[/quote]
5’7" 69cm saddle height short legged cru.
175 - GTFO, I like my knees. Yes it’s a sharp pain.
172.5 - had some problem on a long ride, usually not too bad
170 - no problem
165 - teh best. Just as easy to mash, easier to spin.
I have some leg length discrepancy. I think shorter cranks allow larger margin of error.