Don't let a flat tire you slow down your commute or adventure on the trails. Eventually we all ride on something that will deflate our tires and slow down the fun. The tube has a self-sealing gel inside to help seal small holes and eliminate flats. Tube is compatible with a standard schrader valve stem. The Schwinn 12" bicycle tube fits all types of 12" Mountain bicycles, cruiser bicycles while the schraeder valve is the US standard.