Schwalbe tubes are designed & manufactured to retain air pressure considerably longer than their competitors. Not only is each individual tube inflated & inserted into a mould to ensure that there is even wall thickness & excellent air retention, they are also stored under pressure for 24hrs to test air retention. Valve length of 40mm for Standard version. Weight 140g. Applicable Tyre Sizes: 47-559 – 26 x 1.75 47-571 – 26 x 1 3/8 – 650 x 45c 35-584 – 27.5 x 1.35 – 650 x 35b 47-584 – 27.5 x 1.75 – 650 x 45b 32-590 – 26 x 1 1/4 – 650 x 32a 37-590 – 26 x 1 3/8 – 650 x 35a 44-590 – 26 x 1 5/8 – 650 x 42a 32-597 – 26 x 1 1/4