Schwalbe Tube AV4
Compatible with most Brompton tires

Valve: AV Schrader
Valve length: 40mm

This inner tube weighs in at just 85g and comes with a Schrader / car type valve - 20g (almost 25%) lighter than the Brompton standard inner tube.

The AV4 inner tube fits ETRTO / ISO tyre sizes as shown below:
37-340 - 16 x 1 3/8" and 400 x 35A
28-349 - 16 x 1 1/8"
37-349 - 16 x 1 3/8"
28-355 - 18 x 1 1/8"
35-355 - 18 x 1.35"
35-349 - 16 x 1.35" 
(The ETRTO size is the most accurate way of selecting the correct inner tube and can be found on the side of the tyre) 

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