Rotor R-Hawk Cranksunstoppable Surpassing all the needs of a standard Enduro crank, Rotor's R-Hawk is light, stiff, and entirely reliable. The R-Hawk's modular concept offers compatibility that meets and even exceeds current trends in mountain bike technology. Crank arms are sold independently of an axle and chainrings; there's no longer a factory-assembled arm+axle, both crank arms can be removed from the axle. This way the R-Hawk can be mounted to standard, boost, and downhill axles to suit your specific needs. With direct mount chainrings featuring Rotor's patented Optimum Chainring Position (OCP) system, you get the most out of your pedal stroke. You can also swap out chainrings on the fly using just an 8mm allen key, and adapt to different size frames. Rubber bumpers protect crank arms against wear ensuring that they not only work well, but look good too. You can customize your rubber bumper colors to match your personal style. Completeyour modular Rotor R-Hawk Crank setup:Spindle Options Chainring Options Rubber Bumper Options Features Spindle (sold separately) 30mm diameter. Q-Factor Choose spindle widthsbetween164mm, 170mm Boost, 179mm DH to suit your specific needs Chainline (chainrings sold separately) Available chainring options allow you to choose a 49. 5mm standardor52. 5mm boost chainline Material 100% CNC machined Aluminum alloy 7055Compatibility BBRight / BB30 / Press Fit30 / BSAWeight 665g in the 175mm length | Rotor | Hawk Crank Arms | Black | 175 | Aluminum