303 Firecrest Tubular Disc A1ABLC Sawtooth dimple design that extends all the way to the edge of the rim Construction upgrades that deliver improved impact resistance Go anywhere 45mm rim depth tubular pro proven in Spring Classics and Cyclocross World Cup ZR1 DB hubset is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement Center locking rotor interface. Lockring is included SRAM Model ID: WH 303 FTUD A1