Originally Posted by mcoine
On a 175mm crank its about 5mm of arc difference.
excellent! you actually calculated it
so what is the mm movement for each of those degrees above? that seems like a better way to compare them. when you compare the angles as you did, the differences don't seem like much at all. but 5mm vs 10mm etc at the pedal is perceptible.
again, i am not arguing or anything or saying that will make a better rider...it just did not seem right to me to think of the degrees of differences as you spin a cassette