XX T-Type Power Meter Build KitShifting under load is made possible on the XX cassette due to a combination of X SYNC technology and cassette mapping, creating seamless shifts even during your hardest power output. The XX DUB cranks are based on our proven design from years past, feature our new T Type rings and are compatible with our new Quarq power meters. For more rugged terrain the XX rings are compatible with our removable bash guards. Specifically engineered to optimize