Bontrager's Latex Tubes are an ideal solution for riders who prefer the convenience of clinchers yet seek the supple feel of a tubular. The latex material reduces rolling resistance while their elasticity improves resistance to punctures and pinch flats. There is also a weight savings when compared to standard butyl tubes.Lightweight and low rolling resistanceSupple ride and great feelAdd talc or baby powder to the inside of your tires for an even better ride50mm valve stem700x19-23mmApprox. 70g