Cane Creek Computer Mount Purple ROAD EXT combines Vittoria's peerless knowledge R0 EXT combines Vittoria's peerless knowledge of racing performance with the durability of a long lasting nylon casing that uses a unique Silica and Graphene compound for improved rolling efficiency FeaturesReduced risk of flats on rugged trails PFP (Pinch Flat Protection) rim sidewalls have a wider contact surface at the top of sidewall It attaches directly to the faceplate on most traditional stems and offers a wide range of positions and angles to allow you to put your computer exactly where you want it Note: Fits conventional stems with 4 bolt faceplates that use M5 bolts