The rotor 3d30 road crankset 1725mm rotor39s cnc machined 3d30 crankset with a 30mm axle amp ubb30 bottom bracket technology offers a design that is based on the top end 3d crank yet delivers great performance with an excellent stiffness to weight ratio 110 bcd options are available rotor 3d30 road crankset 1725mm features uses rotor39s ubb universal bottom bracket technology crank arms cnc machined in spain from 7075 aluminium compact spider design