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the issue with running bigger than suggested rotors is that they may put force through the frame/fork/adapter where it can't be handled.... this will depend on fork/frame/adapter though of course
I think this is the only thing that was originally asked isn't it. We've all just been mansplaining to each other about stopping power rather than force through the fork
exactly. bigger rotors achieve more stopping power given the increased mechanical leverage, but there is often diminishing returns in going for bigger rotors if you can lock up the wheel perfectly easily in all conditions with a smaller rotor
the issue with running bigger than suggested rotors is that they may put force through the frame/fork/adapter where it can't be handled.... this will hugely depend on fork/frame/adapter though of course
anyone that thinks rotor size doesn't impact stopping force is completely clueless. there is a reason we dont all just run discs the same diamater as the hub flanges