AV2
14 x 1 3/8"
14 x 1.75"
14 x 1 1/4"
Schrader
40mm valve
About Schwalbe Tubes
A bicycle tube is predominantly made of Butyl rubber. Butyl is a very elastic and airtight synthetic rubber. But as with the tire, other fillers are necessary to make up the rubber compound. The quality of a tube can vary significantly depending on the rubber compound.