Enve Valve stems are made specifically for use with their tubeless compatible 27.5" and 29" carbon rims. You must use Enve tubeless rim tape first, then add valves. These valves have removable cores which is ideal if you plan to use sealant in your tires. These are sold in a pair so pick up a set today to convert a set of wheels. If you just need to replace one, the second becomes a handy spare.