21“ (front wheel) | 2,5mm material thickness
The tube is for a 21 inch front wheel. All enduro and motocross bikes are nowadays supplied with inner tubes in the tyres. These tubes are often very thin (1.4 mm) and you easily get a flat tire. Our X-GRIP tube 21″ is made of butyl and is 2,5 mm thick. Butyl is known for its excellent air impermeability.
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