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CST Bicycle Inner Tube
Inner Tube Size: 26” x 1 3/8 (37-590)
The AV valve, also known as Schrader valve or car valve, is the most popular valve used in inner tubes. These specific inner tubes can be inflated with a car pump or at gas stations using an air compressor.
ETRTO is the European Tire and Rim Technical Organization. The ETRTO size is the best way to check if the inner tube you are buying fits the size of your current inner tube. These numbers are written on the tire in a format similar to postal codes, for example, 32-622. This means the tire has a width of 32 mm and fits a rim with a diameter of 622 mm.
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.