Hello mechanics,

Are there any non-rim brake types that can be installed onto bikes that do not have mounting points on the front fork? I'm aware that they all require some kind of reaction arm, but do they all have to be bolted to some kind of fork attachment?

Specifically I'm wondering if it's possible to after-market a Shimano roller brake system to a folding bike, since I can't find a folder with both internal gears and anything other than rim brakes.

Thanks,

M.