Joined: Dec 2004
Posts: 12,560
Likes: 799
From: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Bacchetta Quattro, Catrike Speed
Sometimes people with knee problems benefit from short cranks. They require less knee bend at the top of the pedal stroke. The idea is to spin more to compensate for the reduced leverage - like eating the elephant in more, smaller bikes rather than fewer large bites.