The R-Evolution pair always includes 1 PTN R-Evolution measuring 27.5 "and 1 PTN R-Evolution measuring 29". In addition, the new Ultraleggere LUFTY2 valves, fabric bag, stickers and description. R-Evolution, the revolution of Evolution! A revolutionary insert developed with the help of the best mountain bikers in the world. A light and unique structure of this kind, optimizes the operation of tubeless systems, increasing the driving precision, saves the rims, allows you to drive even in runflat. Find out all the benefits below in the details. See below: Measurements table to check which size you need!