A high quality inner tube to fit 29" tyres.
These 29" inner tubes are made specifically to fit 29" tyres, including the WTB Stout, Big Apple and Marathon Supreme. Since these tyres have a large volume of air, they need a specially sized tube to fit them. A 28" tube in a 29" tyre is stretched paper thin and is prone to pinch flat punctures. This inner tube is made of thicker than standard rubber, for maximum pinch flat resistance.
As specced on the KH29er and Nimbus 29er.
Schrader valve.