2013 Bikes

^^Hmmm.... Not too sure there. Mtb forks usually state what size discs they will warranty up to, so they must think that extra stress is being applied to the fork with a larger disc. I'll have to read up a bit on that one.

Rim braking is equivalent to having a 622mm rotor.

The further out the caliper is from the centre of the wheel, the more advantageous leverage it has, this is why larger rotors offer stronger braking.

Because the leverage is greater, the stress on the fork/frame is much less than if thr rotor was small and the caliper closer to the axle.