Michelin Airstop motorcycle inner tube.

Road type

21MD

Medium 21" tube to fit    2.50-21 ; 2.75-21 ; 3.00-21 ; MH90-21 ; 80/90-21 ; 90/90-21 ; 80/100-21 ; 90/100-21

Michelin Airstop tubes are available in a wide variety of sizes. Each size is designed for only a few specific applications, so that tube and tyre match perfectly without placing undue stress on the tube.

Unlike inexpensive tubes which are made from straight sections of rubber tube formed into a circle, Michelin Airstop tubes are manufactured and cured in a circular mold. This method reduces the tension on the tube when inflated and diminishes the likelihood of pinch flats.