I ride my bike 10k to and from work daily, and was going through tubes pretty quickly. Bought these because the price was good, but its been 2 months since I put them in and haven't had a flat yet. I ride 50/50 paved trail/gravel road to on my Felt F4x and have been very pleased. Also tour around Europe with the bike, and the cobble stone has not caused these problems either. I also became meticulous about checking the PSI, so maybe I just got smarter.