Hi all... been reaseaching this subject, but getting different advice on fore-aft. Would like to know what "formula" others are using. From what I read, it is usually front of the knee to the center of the pedal spindle or front of the knee to the front of the crank arm (Pruitt) Cranks always at 3 & 9 o'clock. This leaves quite a lot of room for discrepancy.