INNER TUBE 21 INCH FOR TIRE 90/90 - 3.00/3.25 - 3.0 MM

The inner tubes are made of 100% natural rubber and are available in three different thicknesses depending on the use:
The 3.0 mm version is the lightest of the high-resistance tubes (twice the resistance of standard inner tubes).
Among its main strengths is the inflation valve. The valve is normally the weakest point of the tube, and our tubes, in most sizes, use the TR6 standard instead of TR4, like most inner tubes on the market. This particular standard allows for an elliptical rather than circular reinforcement area, which guarantees greater tear resistance while remaining very flexible and adhering to the rim.