The carbon-fiber Record crankset outclasses itself. A new technology of composite materials that was recently introduced to the aerospace industry is now used in the new Record crankset: Multidirectional Carbon Fiber. This new technology distributes the carbon fiber in all directions to produce mechanical resistance in any direction. In addition, if it is not sufficient, Unidirectional Carbon Fiber has been judiciously positioned to further enhance the already outstanding mechanical performance of the Record crankset. - Innovative design for maximum stiffness - weighs just 500 g - greater resistance to static load - greater resistance to fatigue - greater resistance to torsion Light alloy fixing bolts and nuts. Ultra·Drive™ EPS™ chainrings with antifriction treatment . Requires BB with 102mm axle.