I was visited by my old LBS owner from Haarlem. He rode up le Mont Ventoux earlier in the week, and when he started down - the steepest bit, toward Bedoin - his rear wheel melted. That is the best way to describe it, I guess. It is an LEW all carbon wheel that he uses for time trials, etc., but it swelled and started to come apart, as he was hard on the brakes (if you have seen that stretch, and the traffic there, you understand why all the braking).
May be old news, or wrong use, but perhaps worth posting.