Specialized Presta Valve TPU Mountain Tube The Weight Weenie's Trail Spare TPU tubes give you a genuine reason to ditch the old heavier tubes in your trail kit. The clear TPU shell weighs a fraction of a standard tube and pack up small enough to forget it's in your pack until you need it. The alloy valve has a removable core, so you can it top off with a CO2 injector or a floor pump without drama or hassle. Features TPU (thermoplastic polyurethane) construction 57g weight - dramatically lighter than standard butyl, packs to a fraction of the size for jersey pocket or saddlebag carry Presta valve, 50mm, durable alloy with removable core clears standard and mid-depth rims, removable core allows CO2 or pump inflation without compatibility issues Compatible with 27. 5" and 29" wheels, 2. 0-2. 6" tire width spans the most common trail and all-mountain tire sizes in both wheel diameters5% lower rolling resistance than standard butyl measurable efficiency gain for riders who care about every watt on long climbs70% greater thorn resistance vs. standard butyl meaningful upgrade in puncture toughness for trail riding in debris-heavy terrain Specifications Valve Type Presta Valve Length50mm Wheel Diameter27. 5" / 29"Compatible Tire Width2. 0-2. 6"Material TPU (Thermoplastic Polyurethane)Weight57g Intended Use XC, Trail, All-Mountain | Specialized | Presta Valve Tpu Mountain Tube 27. 5/29X2. 0-2. 6, 50Mm, Clear | Polyurethane