Originally Posted by
grumpus
Does it, though? The main part of the power stroke is centred on roughly horizontal cranks, that pedal height varies very little with crank length, why does saddle to pedal distance need to be different?
Seat height is measured from the bottom of the pedal stroke, not the middle so yes the seat will be raised approximately by the difference between the long crank length and the short crank length. This has the advantage that knee height at the top of the stroke is lower relative to the hip by 2x the difference in crank length.