Thorn-Resistant Presta Valve Tube - 27.5/650B x 1.75-2.4

These Thorn-Resistant Presta Valve Tubes are designed to combat punctures from thorns and other sharp objects. The tube features a thicker outer wall (the side against the tire) to stop sharp objects from puncturing all the way through, while the inner wall (against the rim) is thinner to reduce weight. This asymmetrical construction allows you to maintain performance without sacrificing protection against thorns and other puncture hazards.