Schwalbe AV7A Schrader Tube - 20" Tyres - 37-438 28-440 to 37-440 & 28-451 to 37-451

Schwalbe tubes are designed & manufactured to retain air pressure considerably longer than their competitors. Not only is each individual tube inflated & inserted into a mould to ensure that there is even wall thickness & excellent air retention, they are also stored under pressure for 24hrs to test air retention. Valve length of 40mm for standard version. Weight 105g.

Applicable Tyre Sizes:
37-438 - 20 x 1 3/8
28-440 - 500 x 28a
37-440 - 500 x 35a
28-451 - 20 x 1 1/8
37-451 - 20 x 1 3/8