10k miles on one helmet? either you ride a hell of alot or the helmet is really old. you really should replace them ever 3-5 years, and as a commuter and locking up my bike and helmet, my helmet is always geting dinged/dented/strached up and probably making is less safe. not to mention the UV damage, weather both rain and heat here, and the natural degration of stryofoam.

another thing, a herendious crash at 18mph? over on the road form i read all the time, "crashed at 40mph, hit a brick wall and walked out of the ER with narly road rash. ontop of all of that 'no damage to carbon fiber bike.'" and they post pictures. its hard to belive that road cyclist crash safer