Stans NoTubes XC 29er Rim Strip. The #1 selling rim strip. Available in any size for any purpose. Standard Rim Strip: Fits most cross country rims measuring 21.5 to 24.5mm wide. Equipped with 32mm removable core presta valve stems. Downhill rim Strip: Fits most downhill rims measuring 36mm to 39mm wide. Equipped with 32mm removable core schrader valve stems. Freeride Rim Strip: Fits most freeride or all mountain rims measuring 27mm to 34mm wide. Equipped with 32mm removable core schrader valve stems. Enduro Rim Strip: Fits a few particular 26in rims measuring 25 to 28mm wide or 29in rims measuring 24-26mm wide. Equipped with 32mm removable core presta valve stems. Formally called the Rhyno Lite Strip All Mountain 29er Rim Strip: Fits some 29" mountain bike rims including but not limited to: Mavic 520 Touring & Sun Rhyno Lite 29er. Equipped with 32mm removable core presta valve stems. Olympic Rim Strip: Fits the ZTR Olympic, 355, 355 650b, 355 29er and Arch 29er. Can also be used as a lighter alternative to the Standard model in UST rims. XC 29er Rim Strip: Fits most 29" cross country rims currently available. Equipped with 32mm removable core presta valve stems. Cyclocross Rim Strip: Fits most 700c cyclocross and road rims measuring 17mm to 21mm wide. Equipped with 44mm removable core presta valve stems Flow Rim Strip: Fits the ZTR Flow, Flow 29er; Bontrager Rhythm, Duster and 2011 Giant S-XC 29 rims. Alpha 340/400 Rim Strip: Fits the Alpha 340 and Alpha 400 rims when using tube-type cylcocross tires. Equipped with 44mm removable core presta valve stems. If unsure of what rim strip you require follow the link to the Stans Rim Strip finder - http://www.notubes.com/help/rimstripfinder.aspx