TheStan's NoTubes Universal Valve Stemhas been designed with a removable valve core so you can inflate your tyres easier. To install the valve stems, simply temove the included valve and nut and insert the valve through the rim. Then thread the nut on to the valve and tighten by hand. The valve stems are sold in pairs and they are available for both road and mountain bike rims. They are compatbile with tubeless and non-tubeless rims, but you must have the correct conversion kit for use with non-tubeless rims. Stan's NoTubes Universal MTB Valve Stem Specifications Fits the following tubeless rims Stans NoTubes ZTR rims & wheels Sun-Ringle wheels featuring NoTubes BST Technology WTB TCS rims & wheels American Classic tubeless wheels All UST wheels including Crank Brothers, Fulcrum, Mavic and Shimano Bontrager Tubeless Ready rims and wheels w/ Bontragers Tubeless ready rim strip Stan's NoTubes Universal Road Valve Stem Specifications Fits the following tubeless rims Stans NoTubes ZTR rims & wheels Campagnolo 2-Way Fit wheels Corima Tubeless wheels DT Swiss Tricon Tubeless wheels Fulcrum 2-Ways Fit wheels Shimano Tubeless wheels Also fits non-tubeless rims with the correct conversion kit