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Cycling tube from CST. Tube size: 27” x 1 1/4 (622-630 x 37-45). Wall thickness: 0.9 mm. Weight: 205 g. Valve: DV 35 mm.
The DV valve, also known as the Dunlop valve, is primarily used on children's bicycles. The ETRTO label refers to the European Tyre and Rim Technical Organization. The ETRTO number is the best way to check if the tube you are purchasing has the same dimensions as the one already installed on your bike. The numbers are printed on the tire in a format similar to a postal code, e.g., 32-622, which means the tire has a width of 32mm and fits a rim with a diameter of 622mm. Therefore, the tube you are looking for should have a diameter of 622 and a width suitable for your tire.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.