Exar Tube 700c Ultralight TPU TubeLighter Weight for Improved Acceleration : The Tube 700c weighs only 36 grams, which is 3 times lighter than traditional rubber inner tube. The Lighter weight makes it easier to accelerate sprint and stay in the lead while riding. More Compact, More Portable : As a spare tire for cycling, riders hope the inner tubes are more convenient and portable when riding out. The TPU inner tube is 78% smaller than traditional inner tubes. The small size does not