Continental tour 28 all tube high quality butyl tube ideally suited for city and trekkingtouring bikes this version is the best choice for everyday use continental tour 28 all tube specifications etrtosizeweight32 622 47 622 32 630 42 635 700x32 47c 700x28b 34b 27x1 14 28x1 75 2 170g buy continental wheels tyres from chain reaction cycles the worlds largest online bike store