Automotive Disc Rotor Appraisal

Motorcycle Floating Brake Disc Rotor

This item is a used motorcycle disc brake rotor (also known as a brake disc). It features a two-piece construction, common in performance or aftermarket rotors, consisting of a central hub (bell) made of a dark-colored, likely anodized aluminum alloy, and an outer friction ring made of steel or cast iron. The hub is black with multiple circular cut-outs or spokes for weight reduction and cooling, and a central circular opening for mounting onto a wheel hub. The friction ring is attached to the central hub by visible silver-colored rivets or floating bobbins, indicating a 'full floating' or 'semi-floating' design, which allows for thermal expansion and reduces warping. The surface of the friction ring shows clear signs of wear from brake pad contact, including concentric grooves and scoring across its entire braking surface. There is also a noticeable wear lip along the outer edge of the friction ring, suggesting significant use and material removal. The metal exhibits a dark, somewhat oxidized patina consistent with used ferrous metals. There are handwritten markings on the friction ring in blue, which appear to say 'Front' and possibly 'RMDL 73' or similar alphanumeric designations, likely inventory or fitment notes from a mechanic. A small chip or imperfection is visible along the outer edge of the friction ring in one area. The overall condition suggests it is a used part that has been in service, showing typical wear and tear but no catastrophic damage visible from this angle. The two-piece design points to a mid-to-late 20th century or early 21st-century motorcycle application, possibly for a sportbike or higher-performance cruiser due to the floating design and vented hub.