Stans no tubes xc 29er tubeless kiteasily convert non tubeless tyres and rims to tubeless in late 2000 stan developed a method of converting an existing mountain bike rim and tire to tubeless use by removing the traditional tube and replacing it with a molded rubber rim strip to seal the spoke bed of the rim and a liquid tire sealant to seal the tire and prevent punctures a whole world of opportunities was created this kit will fit most 700c cyclocross rims measuring 17mm to 21mm wide molde