Vortex 125ZK-50 CAT5 Aluminum Rear Sprocket 50-Tooth 420 Pitch

The Vortex 125ZK-50 is a CAT5 series CNC-machined aluminum rear sprocket featuring a 50-tooth count on a 420 pitch, engineered for high-performance mini-bike and small-displacement motorcycle applications. Precision-machined from premium 7075-T6 aerospace-grade aluminum, this sprocket delivers a significant weight reduction over OEM steel units, directly reducing rotating mass for sharper throttle response and improved acceleration.

Key Features:

• CAT5 Series Construction: CNC machined from 7075-T6 aerospace aluminum for maximum strength-to-weight ratio
• Anodized Finish: Hard anodized coating provides corrosion resistance and a distinctive appearance with silver-highlighted tooth edges
• 50-Tooth / 420 Pitch: Designed for 420 chain applications at 50 teeth for tuned acceleration gearing
• Reduced Rotating Mass: Lightweight aluminum construction improves throttle response over heavier OEM steel sprockets
• Precision Fit: Tight CNC tolerances ensure a perfectly concentric sprocket and smooth, efficient power delivery
• Optimized Tooth Profile: Purpose-designed tooth geometry minimizes chain wear and extends drivetrain service life

The Vortex CAT5 aluminum rear sprocket is a trusted choice among performance riders and racers seeking to fine-tune their gear ratio for improved low-end pull or optimized acceleration. Vortex Racing sprockets are manufactured to exacting standards and used at all levels of motorcycle competition worldwide.