I ride a Specialized Roubaix pro with Roval aluminum wheels and wonder if anyone has thoughts on how well aluminum dissipates the heat caused when braking. Is there risk of the heat building to such a point it may cause the air to expand in the tube and cause a blowout of the tube and/or tire? I normally don't worry about it much, but was just riding and climbing a hill yesterday and wondered about this as it was a VERY steep hill and required heavy braking to control my speed. Several factors worried me. It was very warm (warm for me anyway in CO), the stretch had a couple of miles of fresh (black) pavement radiating lots of heat, and the descent was extremely steep. (Don't know me for being ignorant. I'm not completely new to cycling, just am not all that knowledgeable of the mechanics and physics of things.)