Continental race 28 tubecontinentals high quality butyl race 28 tube is perfectly suited to road racing lightweight and effective this butyl tube is another addition to your cycling arsenal this season features threaded42mm and 60mm valve un threaded80mm valve high quality butyl tubeetrtosizeweight18 622 25 63027x34 1 700x20c 25c105gbuy continental wheels tyres from chain reaction cycles the worlds largest online bike store