I'm about to head on a 1400 mi tour, but every time I go on a 10 mile+ bike ride, my right liofemorral ligament starts to hurt; the longer I go, the worse the pain gets.
My bike saddle height is adjusted to let my leg be completely extended when I use the heels of my feet to pedal. My fore aft position is adjusted so that the bone right below my knee forms a perpendicular line with the ball of my foot and the center of the pedal. My stem is slightly too long (I can see the hub of the front wheel), and it's adjusted to be the same height as my saddle.
Any idea what might be causing the ligament pain?