Your first line of defence against punctures on demanding terrain. The CST Thornproof Tube features extra-thick reinforced rubber walls designed to block thorns, glass, and trail debris before they reach your tyre. Sized to fit 20-inch tyres from 2.2" to 2.5" width, with a 48mm Schrader valve that's compatible with standard pumps and petrol station inflators. A reliable choice for cargo bikes, e-bikes, fat tyre commuters, and off-road riders where flats aren't an option.