Attack dirt jumps or climb rocky hills with Bell® Standard Schrader Valve 20” Bike Tube. Designed for BMX and mountain bikes, this 20” tube is a must-have for replacing flats on the trail or at the park. It’s made with durable yet lightweight butyl rubber to withstand tough tricks and rugged terrain. The 35mm Schrader valve is partially threaded to seal in pressure. Flats are no sweat with the Bell® Standard Schrader Valve 20” Bike Tube.