Airtightness. Apart from the quality of the ingredients, the purity of the rubber mixture is crucial to the quality of the tube. The base material is therefore sieved at enormous pressure through seven filters before being extruded. All tubes are inserted into a mould and inflated for vulcanization to ensure constant wall thickness and high air pressure retention.

Reliability. All tubes are inflated and stored for 24 hours in order to test for air pressure retention. Afterwards each, individual tube undergoes a careful visual inspection. This special quality control helps prevent unpleasant surprises and is why, over many years, Schwalbe tubes have become highly respected for outstanding reliability by bicycle dealers.

Group tube system. Only high elasticity and good quality allows a tube to cover very many tire sizes. Tube No. 17 can fit tire widths between 28 mm and 47 mm and that is a big advantage to the trade and simultaneously it vouches for the tube's quality. Only an extremely high-quality and reliable tube is up to this requirement.

Valve. All valves are nickel plated and threaded and valve inserts are replaceable. Also Schwalbe tubes with the classic bicycle valve are capable of pressure testing thanks to a high pressure valve seal. And it is plain to see as each tube is crowned with a transparent polycarbonate dust cap.

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PLEASE READ ENTIRE TEXT
BEFORE PURCHASE

While we offer returns on all unused tube and tire products we are not responsible for the freight costs of miss-orders. We do our best to use the manufacturer’s sizing information but it is not uncommon for tubes, tires and attached labels and boxes to have different markings for products sold to different international markets. This can cause confusion. As an example there are many different diameter twenty, twenty-four, twenty-six inch and 700 tires that are not interchangeable. Most 20 inch tires rarely measure 20 inches and 700 tires almost never measure 700 mm for instance. Please double check tube valve type, and tube valve length if important to fit your rim as well.

Also, all tubes have a range of fits but tires have an I.S.O. number that begins with a width of millimeters and a bead seat diameter ( which is critical ) in millimeters in this format  XX-XXX on your tire if reasonably modern along with many other fractional and decimal measurements. Often fractional and decimal tire notations are at odds with the actual size and should not be relied upon. Please Google “Sheldon Brown’s Tire Sizing Systems” for a better explanation or contact us if you are unsure before ordering. Again we are not responsible for miss-orders due to incorrect sizing.

Please understand tubes fit a range of tire sizes and there are multiple size marking that may be compatible but you are responsible for ordering the correct size.  Please contact us if you are unsure of compatibility for your tire.

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