Disc brake rotors can be susceptible to bending & warping, from trail obstacles, heat build-up or even during transit. Bent rotors cause excessive drag and unpleasant noises, or even bring your ride to an early conclusion. The X-Tools disc rotor truing tool lets you correct bends in the disc rotor; the shallow slot targets smaller kinks at the outer edges, while the deeper slots reach down to the spokes to correct warping & deeper bends. Each slot is calibrated to match the thickness of a disc brake rotor & machined with round corners to help eliminate scratching.