These Continental MTB 29er inner tubes are ideal replacements or spares for when the inevitable puncture happens. Made from Butyl rubber, these tubes fit 29-inch MTB wheels in 1.75 – 2.5-inch sections. Continental MTB cycling tubes are available in Schrader or Presta valve options, all made with a seamless construction and uniform roundness. Ideal to get you back up and riding in no time. Key Features Butyl rubber mountain bike tubeFor 29er MTB tyresUnitube size fits 29-inch wheels in 1.75 - 2.5 sectionsSchrader or Presta valveAll tubes have a seamless construction, with a mould-cured vulcanisation, to ensure uniform roundness