Mountain bike tube. Wheel Size: 29 Tyre Width: 1.75 - 2.5 Valve Type: Schrader Weight: Standard. Continental MTB 29 Mountain Bike 29ER Inner Tube 29" x 1.75-2.5 Schrader - 40mm. Boxed Continental MTB 29 Light made from Butyl. Valve: Schrader. Valve Length: 40mm. ETRTRTO Size: 47/62-622. Size: 29 x 1.75-2.5. Weight: 225g approx. Butyl rubber MTB tube. Seamless construction, with a mould-cured vulcanisation, to ensure uniform roundness. By fitting different types of tubes you can actively influence the handling characteristics of your bike with little effort. Different wall thicknesses and the associated characteristics make this possible. All tube types listed are made of a high quality butyl mixture. Presta or Schrader valve. Butyl tubes with the usual Continental quality. Each and every inner tube passes a stringent 100% quality control inspection. Seamless construction, with a mould-cured vulcanisation, to ensure uniform roundness and give a smooth ride.