Schwalbe SV19a Tube The Schwalbe SV19a Tube is a new option from Schwalbe to cater to the growing 29er crowd, with a lighter overall weight compared to the regular SV19 tube, reducing rotational weight from your bike in the best dollar-per-gram ratio available. Like all Schwalbe tubes, they are made for riders who are sick of using cheap and nasty tubes that just seem to puncutre a little more easily than what they should. These are a great upgrade from the stock tubes that come on new bikes, which are usually heavy, low-rent items to keep the costs down. For just $30, you can drop up to 200 grams in rotational weight from your bike!
"A Tube is not just a Tube" 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. Elasticity 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 to this requirement.
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