My fixed gear had a 700x28 contact on the rear for a while. I hated it, the ride was really uncomfortable and harsh. I felt every tiny crack and piece of debris I rode over. It also wore out quicker than I was happy with, but I'm pretty harsh on my tires. I don't recall getting a flat on this tire though. Ironically I am now rolling on another conti tire, a gatorskin. The price difference was only $4 or 5, and I love the ride of the gatorskin. smooth and buttery.