Originally Posted by
Frkl
Not that it will make a difference in changing your mind, but disc brakes on cars, and especially high performance cars, have gotten progressively larger in diameter until they are limited by the rim. But the rim on a bike doesn't limit in the way a car rim does.
Brake rotors only need to get much bigger if power, tyre grip levels or weight significantly increase. None of these things are going to happen on bicycles and certainly not to the extent of requiring 600 mm rotor diameters. Do you see any rim-braked motorbikes out there?