Originally Posted by
Ditka86
I think you get a decrease in saddle height (not that I think 2.5mm decrease/increase would be noticeable) by using a longer crank. Your pedal would be 2.5mm lower at the bottom of the stroke than where it is now so you would need to lower the seat, granted it is also 2.5mm higher at the top of the stroke. I don't know of anyone who sets their seat based off of where the pedal is at the top of the rotation though.
This. Its what I was saying earlier. Because the pedal circle shrinks away from you the saddle must be lowered to meet it. But 2.5mm is not a perceptible difference. I don't even think 5mm is. A couple of degrees difference in the pointing of the toes makes much more difference.
H