This Schwalbe AV4 16/18 inch tube is our most popular inner tube - favoured by us and Brompton riders
It is exactly the same tube as the Brompton XL tube with the addition of a rim nut (see below for more info about rim nuts) and a box. It fits all Brompton tyres.
This inner tube weighs in at just 85g and comes with a Schrader / car type valve - that is a whopping 20g (almost 25%) lighter than the Brompton standard inner tube.
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