Vortex 825A-45 Aluminum Rear Sprocket Chain Sprockets - 45-Tooth 520

The Vortex 825A-45 is a 45-tooth aluminum rear sprocket designed for 520 chain applications. Engineered by Vortex Racing — a USA-based manufacturer with decades of motorsport experience — this sprocket delivers the lightweight performance and precision fit that racers and serious street riders demand.

Constructed from a specially formulated aluminum alloy per Vortex's exacting specifications, the 825A-45 is 100% CNC machined in the USA for consistent concentricity and reliable power delivery. The silver anodized finish provides corrosion resistance, while Vortex's patented unique tooth profile reduces chain wear and extends the service life of both the sprocket and chain.

Key Features:

• 45-tooth rear sprocket — optimized for increased low-end torque and acceleration
• 520 chain pitch compatibility
• Lightweight aluminum construction reduces rotating mass for improved throttle response
• 100% CNC manufactured in the USA for precise tolerances
• Specially formulated aluminum alloy per Vortex specifications
• Silver anodized finish for corrosion protection
• Patented tooth design for extended sprocket and chain longevity
• Lightening holes further reduce rotating mass

The Vortex 825A series is designed to fit specific aftermarket wheel hubs including Marvic and Galespeed wheels, featuring a 6-bolt mounting pattern with a 100mm bolt circle, 10.5mm bolt holes, and an 80mm hub diameter. Whether you're tuning for the track or optimizing street performance, the 825A-45 is a proven upgrade over stock sprockets.