Michelin pro4 service course v2 black 25c tubethe michelin pro4 v2 road bike tyre is a great option for the sportive rider thanks to a bi compound tread which provides greater puncture protection increased durability and excellent grip pair this with the airstop butyl tube and youre onto a winner airstop butyl tubes answer the needs of everyday cyclists for economical high quality inner tubes they offer excellent puncture resistance and the consistently high quality for which michelin