Stans no tubes standard tubeless kit stans tubeless system converts your existing wheelset to tubeless allows you to use either standard or tubeless tyres saving hundreds of pounds and weight over purchasing other tubeless systems features fits most standard mountain bike rims mavic 221 317 517 519 223 and sun 0 xc ufo sub4 etc also fits bontrager 29er disc rims note rim strips feature presta valve stems two molded rim strips with presta removable valve cores one pint of tyre