Schwalbe AV4 16-18 inch Inner Tube - Schrader Valve

Schwalbe AV4 16/18" standard inner tube with Schrader valve. Use this size for Brompton bicycles, not the AV3 inner tube. Fits Sizes: 28-340: 400 x 30A 28-349: 16 x 1 1/8 28-349; 16 x 1.10 28-355: 18 x 1 1/8 28-355: 18 x 1.10 30-349: 16 x 1.20 32-340: 16 x 1 3/8 x 1 1/4 400 x 32A 32-349: 16 x 1 1/4 32-349: 16 x 1.25 32-355: 18 x 1.25 35-349: 16 x 1.35 35-355: 18 x 1.35 37-340: 16 x 1 3/8 400 x 35A 37-349: 16 x 1 3/8 37-349: 16 x 1.40 Image is for illustration only. Specific sizes shown on the image may not be relevant to the tube in the description Why Choose Schwalbe Tubes? Besides the quality of the ingredients, the purity of the Schwalbe rubber compound is decisive for the quality of the tube. Before extrusion, the basic material is forced through a total of seven filters under enormous pressure. All tubes are inserted and inflated into a mould for the vulcanization process. This ensures an even wall thickness and high air retention. All tubes are inflated and stored for 24 hours to