Originally Posted by
marqueemoon
Good point. The same conditions would make for hotter rotors and brakes more prone to fade, but I guess I would prefer that to a high speed blowout.
Well.... The smaller rim has a smaller diameter, so in theory it could have problems dissipating heat. That factor isn't going to affect a disc brake setup, as the heat dissipation will depend on the rotor size, along with properties of the pad and design of the calipers.
That said, I never had an issue with 20" rims getting too hot, and did just fine with v-brakes. I'd say discs offer much more advantages for larger wheels than smaller ones.