Rotor R-Hawk Bumper Set These bumpers slide on to your Rotor R-Hawk Cranks to protect them from jagged rocks, roots, and other protrusions. They're low profile, and built to stay put while you ride, giving you excellent protection that doesn't get in the way of your pedal stroke. Features Set of 2 for one pair of R-Hawk Cranks Crank length compatibility 165mm to 175mm | Rotor | Hawk Bumper Set Blue