Reinforcement of the tube in the area of the rim arm markedly lowers the possibilityof the puncture ¨Snake bike¨. When running against a hindrance and during deformation of the tyre profile the tube walls strike against each other. The reinforced part of the tube is softer with higher flexibility and camber radius. This highers the tube wall interface, lowers the specific pressure and the puncture strenght, which is dangerous for the interior part of the tube profile, is subsequently lowered. This effect can be reached by null weight increase. This tube construction finds its use in extreme terrain conditions DH, FR, 4X, and XC.