Made of butyl rubber, durable and wear-resistant. High air tightness, needn't waste too much time on pumping tire frequently. Designed with American valve, easy to pump tube up.
Suitable for tube specification of 20 * 1.9 / 2.125.
This sort of inner tube is suitable for tube specification of 20 * 1.9 / 2.125. It is a good bicycle inner tube to keep your tube inflated.
Material: Butyl rubber
20in wheel bikes