STRONG. LIGHT. AFFORDABLE. Yes, it's possible to have all three. Thermoplastic Polyurethane (TPU) Tubes are an innovative and high-performance alternative to conventional bicycle tubes. Like any new technology, it's usually expensive, and TPU tubes were once reserved for the cycling elite, costing up to 5 times more than a regular rubber tube. Entity has teamed up with the industry leader in TPU, RideNow , to bring you a 60% reduction in weight, improved puncture protection , enhanced riding dynamics , and ease of use compared to rubber tubes - all at an affordable price point.