Description Spears Racing 415 Lightweight Rear Sprocket. Elevate your racing performance with the Spears Racing 415 Lightweight Rear Sprocket, precision-engineered for Kawasaki Ninja 250, 300, 400, 500, and Yamaha R3 motorcycles. Crafted from the highest-grade aerospace-quality 7075-T651 aluminum, this sprocket is fully machined—not stamped—for exceptional durability and strength, capable of withstanding the rigorous demands of track abuse. Weighing just 9.64 oz (274g, depending on tooth count), it stands out as the lightest machined 415 rear sprocket available on the market. Unlike stamped alternatives, our machined design ensures perfect alignment with your chain and front sprocket, eliminating any wobble for seamless operation. Trusted by professionals, these sprockets have powered track-day enthusiasts, purpose-built race bikes, and championship-winning teams. Notably, they’ve been the choice for two-time BSB Junior Supersport Champions and numerous MotoAmerica Junior Cup race teams. They’re also widely used in premier racing series such as WSS300, BSB Junior Supersport, AFM, ASRA, CMRA, CRA, CVMA, and WERA. For decades, Spears Racing has led the industry in innovating products for commuter-style bikes repurposed for racing. Our commitment to excellence drives continuous advancement, resulting in proprietary components tailored to specific applications through rigorous research and development. This sprocket exemplifies that dedication, offering a vital performance upgrade for small-displacement race machines.Switch to a 415 pitch chain kit for a lighter, narrower setup compared to a 520—reducing rotational weight and enhancing agility on the track. If you’re racing a Kawasaki Ninja 250, 300, 400, 500, or Yamaha R3, the Spears Racing 415 Lightweight Sprocket is essential for optimizing your setup.Key Features: Ultra-Lightweight Design: Minimizes rotational mass for quicker acceleration and better handling. Precision Machining: Guarantees true alignment and superior longevity. Proven Track Record: Backed by champions and top racing organizations. Made in the USA: Quality craftsmanship you can rely on. Upgrade your ride today and experience the edge that Spears Racing delivers. Contact us for sizing options, tooth counts, and compatibility details.