Continental tour 28 slim tube high quality butyl tube ideally suited for city and trekkingtouring bikes the slim version offers a lower rotating weight without sacraficing tube thickness therefore helping to increase speed continental tour 28 slim tube specifications etrtosizeweight28 609 37 642 700x28 37c 27x1 18 28x1 38 1 58 155g buy continental wheels tyres from chain reaction cycles the worlds largest online bike store