Probably just because Carlisle hasn't been known (to me at least) for making great tires in the past like ITP has been doing since they came out. Name value means a lot these days I suppose.Like others have said, I don't know why more people aren't running this tire...to me, it was a no brainer over several of the ITP's. They had the width I wanted (9&11), the tread design with a deep lug, the 6 ply rating with the radial ride, and lighter weight than many ITP's. And, from what I've been told, Carlisle makes ITP's!!