This inner tube is designed for any cyclist who wants to cycle and spend less time on inflation. It features a high proportion of pure butyl rubber, which allows it to retain air for much longer. This means you have to inflate less often. Thanks to these properties, it is perfect for bikes that carry high loads such as E-bikes and cargo bikes. Schwalbe has also equipped this model with a 70% greater wall thickness, so you can benefit from its robust puncture protection on your travels. One final highlight is it's 100% recyclable, which means if it ever needs to be replaced it can be done in an environmentally friendly way. Technologies: HIGHER AIR RETENTION: Due to the high proportion of pure butyl rubber, the Schwalbe Air Plus tube retains air significantly longer than conventional bicycle tubes. Therefore you have to inflate less often. MORE PUNCTURE PROTECTION: With around 70% greater wall thickness, the Schwalbe Air Plus is particularly robust - and so it's well protected against pinch and penetrating punctures. 100% RECYCLABLE: If the Schwalbe Air Plus ever needs to be replaced - like all other Schwalbe tubes, it is 100% recyclable. Manufacturer's Part Numbers: STUAP01 Black Black 20" Option 1 1.5" - 2.4" Active TW 150 STUAP02 Black Black 26" Option 2 1.5" - 2.24" Active TW STUAP03 Black Black 27.5" Option 3 1.5" - 2.4" Active TW STUAP04 Black Black 27.5" Option 4 2.1" - 2.8" Active TW 150 STUAP05 Black Black 700c Option 5 37c - 47c Active TW 150 STUAP06 Black Black 29" Option 6 1.5" - 2.4" Active TW 150 STUAP07 Black Black 29" Option 7 2.1" - 2.6"