Heidenau motorcycle inner tube The Heidenau bicycle inner tubes are consistently made of natural rubber. This material is very resistant and has high safety reserves. Furthermore, it can be described by the opposite synthetic material (butyl) significantly higher elongation behavior than different tire sizes with only one lid formed a tube. - Valve: 34 G - Straight valve - Valve position: Centered tube - Wall thickness 2.0 mm Suitable for the following tire sizes: 02:50 - 16 2,75-16 03:00 - 16 03:25 - 16 70/90 - 16 80/90 - 16 90/90 - 16 100/90 - 16 80/80 - 16 90/80 - 16 100/80 - 16 80/70 - 16 90/70 - 16 100/70 - 16