The Michelin Airstop Butyl A1 inner tube is a safe bet for all road bike enthusiasts.Whatever the type of practice, it offers an almost unbeatable quality / price ratio.Good performance, puncture resistance, pressure maintenance all of Michelin’s experience comes together in the Airstop inner tube. The famous Michelin inner tube in BUTYL. Resists punctures. Maintains pressure thanks to BUTYL. Valve length suitable for profiled rims. Cyclo tourist & sport route. Presta 52 mm.