Afam Rear Aluminum Sprocket Aprilia / BMW 450cc-550cc Afam Aluminum Rear Sprockets combine low weight with race-proven durability. CNC machined from ultra high strength 7075-T6 aluminum, they provide an effective balance of reduced rotating mass and efficient power transfer. AFAM's tooth profile supports precise chain engagement, true concentricity and smooth driveline performance. For off-road use, the MX Self-Cleaning series uses a 3D relief design to remove excess material without compromising strength. Mud grooves at the base of the teeth help clear sand, mud and trail debris quickly. Features: CNC machined from high-strength 7075 T6 aluminum alloy to deliver incredible structural integrity with minimal rotating mass Hard-anodized layer in a sleek Gun Metal finish on off-road models drastically reduces tooth wear and extends drive-line life Integrated mud grooves at the base of the teeth quickly clear out sand and grit to maintain proper chain tension 3D relief shaping sheds non-critical material for maximum weight reduction without sacrificing strength or safety Engineered with exact off-road tolerances and AFAM's signature tooth profile to ensure optimal chain fitment and reduced friction Off-road MX versions are also available in vibrant color-anodized finishes to match your bike's custom style Note: Images are for reference only.