High quality Schwalbe inner tube in Schrader valve (car type) format.
Resated from official literature: "Extremely air-tight! Less air loss means having to inflate less often. Our unique rubber mixture makes it possible. Extremely reliable! Each SCHWALBE tube is individually examined twice at the factory to ensure air-tightness. Special quality control that prevents unpleasant surprises."
40mm valve stem, compatible with all Brompton factory rims.
Compatible with all Brompton tyres and the following tyres: