Originally Posted by ZachS
And don't forget to mention that a rim brake IS a disc brake - with a 26" diameter disc. I don't know much about mountain bike parts, but the really fancy high-end super powerful DH disc setups all use larger discs, right?
Optimum size of 8inches. Companies tried bigger but got to much power and not enough modulation. Companies have gone the way of more pistons instead of size. There was one trials bike with a 24" rotor. Damn funny looking thing
There is an optimum distance from the centre of the hub for both modulation and power.