Thet rotor 3d road triple crankset 170mm the rotor 3d road triple crank was designed with a 30mm axle with performance and functionality in mind it39s being both lighter and stiffer than the 3d crank with titanium axle the crank arms of the rotor 3d are made of 100 cnc machined 7055 aluminium which have been trinity drilled for a further weight reduction because of the cnc machined and black anodized surface the 3d is featuring an attractive finish in contrast to other cr