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 17/18 H RET Airstop inner tube with oblique outlet valve. Suitable for tire 7.00x18 6.50x17 7.00x17 30x6.75 6.50x18 6.00x18 30x6.75