The thing with rim brakes is, even if they could ultimately take more heat input than a disc... the way you find out that you have exceeded your tires limit of heat input is when it fails. I personally would rather the warning of impending brake failure caused by spongy braking of disc brakes. I also doubt that there is anything on the rim brake side that can compare to Ice Tech type rotors in 203mm gripped by hydraulic calipers. Seriously doubt that there is a tire made that can cope with the kind of heat input that the disc brake setup I just mentioned can.