About two years ago, I bought the newly released Pro4 Endurance from the Michelin Pro4 line to replace a worn set of Krylion Carbons (one of my all time fave training/commuting clincher) because Krylion Carbon had been discontinued. At least that's what I thought. Lately I have noticed Krylion Carbons showing up on line and on the shelves in Performance websites and stores, but they are not listed on Michelin web sites. What explains the reemergence? Is Michelin making them again, did Performance buy the name, or are these overstocks from previous years? I have been happy with pro4 Endurance but have found them to be not quite as puncture resistant or durable as the Krylion Carbons.