The MICHELIN inner tube remains to this day the best quality available on the market, it is thicker than other ranges, and is more resistant to the most extreme stresses. MICHELIN MICHELIN 19/20 H RET Airstop inner tube with oblique outlet valve. Suitable for tire 5.00x21 6.00x21 7.00x21 15x50 17x50 5.00x19 7.00x19 5.50x20