Intrepid Bicycle Commuter
Joined: Sep 2009
Posts: 819
Likes: 95
From: Upstate New York
Bikes: 1976 Motobecane Grand Jubile, Austro Daimler 'Ultima', 2012 Salsa Vaya, 2009 Trek 4300, Fyxation Eastside, State Matte Black 6, '97 Trek 930 SHX, '93 Specialized Rockhopper, 1990 Trek 950
Sounds like anatomy. One leg could be longer than the other, changing your sitting position, which is somewhat common.