BBB Cycling BTI-211 TPU gravel tube — engineered for cyclists who demand reliability and weight savings. This lightweight 700C tube features a durable TPU construction that resists pinch flats and extends tire life. Available in a 65mm or 85mm alloy presta valve valve and removable core, x2 patches included. For easy installation and maintenance. Sized for 32-47mm tires at just 46 grams, it delivers the performance edge you need without the bulk.