I recently saw an article comparing the rolling resistance of various tires. The Vittoria Open Corsa EVO CX Team CSC Limited Edition were highly rated and on sale at Nashbar, so I bought a pair. I've put between 100-150 mi. on them and like them a lot. However, today I noticed a couple of significant nicks in the rear tire. One was definitley through to the tube and the other was deep but not through yet. Just wondering if this is typical of the tire construction. You know, like fast but fragile. Or, is this just bad luck?