The new Super Record Wireless Cranksets are designed to efficiently transmit every possible watt of power to the road for uncompromising perfomanceExcellent 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-chaining172.5x45/29UTCRBN123x4B2x12UPC/EAN/GTIN: 8053340459634