Yeah, they were a ***** tp put on, but they were very durable. They seemed like a great tire for a concrete track, but the one time I rode them in LA I couldn't hang with my (very slow) warm up group- they were too slow and I was slipping every corner. Had to go faster. Next time I came down I rode my whatever clincher training wheels and no slippage. I was pretty surprised. Did the usual prep (scotch write + alcohol) pre ride.