Left pedal has right hand thread,right pedal has left hand thread,because of precession.
If you take a pencil and move the eraser in the palm of your hand in a small clockwise circle,the pencil will rotate counter clockwise,that is precession.
It's the same reason the pedals thread into the crankarms the way they do.
Last edited by Booger1; 01-12-11 at 11:47 AM.