Due to the high pure butyl content, the Schwalbe Air Plus inner tube retains air significantly longer. This means less frequent inflation is needed. Higher puncture protection Thanks to its thicker wall strength, the Schwalbe Air Plus is particularly robust and therefore very well protected against punctures. If the Schwalbe Air Plus still needs to be replaced, it is 100% recyclable, just like all other Schwalbe inner tubes. Ideal for E-Bikes and Cargo bikes. Schwalbe AIR PLUS bicycle inner tube no. 19 L AP. For bicycle tires in size 29" inch (ETRTO 54/65-622). With even more volume. Retains air even longer thanks to the greater wall thickness. Less frequent re-inflation needed. Also offers above-average puncture protection.