The smarter hardtail! Procaliber sets the bar for hardtail speed and smarts. It’s the fast, ultralight cross country ride that rules the singletrack, from the local race scene to the World Cup XC. Procaliber’s innovative IsoSpeed decoupler delivers uncompromising XC performance, efficiency, and an incredible ride feel. It’s the fastest, smoothest, smartest hardtail on the trail. Key features include: Smooth IsoSpeed decoupler: ride faster, stronger, longer, Boost 148/110: stronger wheels, more tire clearance, shorter stays, OCLV Mountain Carbon frame is fast, light, and trail tough. Ride the fastest wheel that fits with Smart Wheel Size.