Schwalbe mountain bike inner tubemade from schwalbes unique rubber mixture, this tough mountain bike mtb inner tube is ready for the harshest off road trails. Its high quality construction ensures air loss is kept to a minimum, so you can quickly grab your bike and go, without having to inflate your tyres each time. To ensure this airtightness is assured on every tube, each model is checked twice at schwalbes factory before it reaches you.features valve type separate presta and schrader option valve length 40mm valve core removeable yes less air loss means having to inflate less a unique rubber mixture provides a reliable tubeeach tube is individually examined twice at the factory to ensure airtightnessbuy schwalbe wheels tyres from chain reaction cycles, the world's largest online bike store.