The new Super Record Wireless Cranksets are designed to efficiently transmit every possible watt of power to the road for uncompromising perfomanceIntegrated powermeter allows for taking training regiments and rider input to the next levelExcellent stiffness and optimum power tranmission from pedal to drivetrainUSB ceramic bearings for unparalleled smoothness and friction reductionOptimized design for use with any chainring combinationSymmetrical teeth on the internal chainringFluid, precise power transmission even with extreme cross-chaining172.5x48/32UTCRBN123x4B2x12