I got a set of these recently and threw them on for some training. I was skeptical because I normally ride a very tough tire like a gatorskin or armadillo. I rode 10 hours in Seattle in 3 days on dirty, wet back roads. So much junk was sticking to the tires from the rain, but I didn't get any flats. These feel a lot better cornering than the hard rubber wire beads I am used to, and are lighter. My new favorite trainer!