Continental tour 28 light tube high quality butyl tube ideally suited for city and trekkingtouring bikes the light version offers a lower rotating weight therefore helping to increase speed the lightweight version has a lower thickness so keeping them inflated to the correct pressure will help prevent the risk of pinch flats continental tour 28 light tube specifications etrtosizeweight32 622 47 622 32 630 42 635 700x32 47c 700x28b 34b 27x1 14 28x1 75 2 100g buy continental wheels