Vee Rubber bicycle inner tube The bicycle inner tubes made of natural rubber are very robust and have high safety reserves. The high deformation behavior of natural rubber can be a coating of various tire sizes with a single tube size. Vee Rubber has over 30 years as a leading manufacturer of motorcycle tires and tubes and as OEM work for many top brands. Valve: TR4 straight valve Wall thickness: 1.6 - 1.7 mm Fits the following tire sizes: 2 1/4 -16 2 1/2 -16 2:00 -16 2:00 -17 2:25 - 16 70/90 -16