Michelin wild gripr2 tyre 26 x 21 free tubethe michelin wild gripr2 is your go to tyre for mixed terrain it provides excellent grip and rolling resistance as well as efficiency when cornering or leaning over pair this with the michelin c4 airstop butyl mtb tube and youre onto a winner michelin c4 airstop butyl tubes answer the needs of mtb riders for economical high quality inner tubes they offer excellent puncture resistance and provide better resistance to friction caused by spokes