I'm not sure about the Pikes Peak thing, but years back Indycar and not sure about the CART series, had an issue with rotors exploding..and the road race at Sonoma(I believe) NAPCAR just had a couple weekends ago had at least 2 rotor fails if I'm not mistaken. With Indy/CART type cars they went to carbon fiber because the cars had gotten so fast that on cooler days the thermal shock up & down was to much for the alloys they were using...pricey & they may still fail which is usually instant.... & .just like the Titan, catastrophic.