Michelin wild gripr2 tyre 29 x 21 free tubethe michelin wild gripr2 is your go to tyre for mixed terrain featuring gum x series compound this tyre provides extraordinary grip and superior service life pair this with the michelin a4 airstop butyl 29 tube and youre onto a winner michelin a4 airstop butyl tubes answer the needs of mtb riders for economical high quality inner tubes they offer excellent puncture resistance and value for money tyre features size 29 x 21 tpi60 psi26