Vee Rubber bicycle air hose The two wheel air hoses made of natural rubber are very robust and have high safety - reserves. The high strain behavior of natural rubber can be a cover of different tire sizes with one tube size. Vee Rubber has more than 30 years leading manufacturer of motorcycle tires and tubes and is as OEM for many top brands worked. Valve: TR4 straight valve Wall thickness 2.7 - 3.0 mm Suitable for the following tire sizes: 3 o'clock -21 80/100 -21 90/90 -21 90/100 -21