Vortex 170ZRV4-39 VTX Aluminum Rear Sprocket Pitch Sprockets - 39T 520

The Vortex 170ZRV4-39 is a VTX series CNC-machined aluminum rear sprocket featuring 39 teeth and 520 pitch, engineered for performance motorcycle applications. Vortex sprockets are manufactured in the USA and are a favorite among track day enthusiasts and racers seeking a lightweight alternative to OEM steel sprockets without sacrificing durability.

Key Features:

• 39 Teeth — bolt-on gearing change for optimized acceleration or top speed
• 520 Pitch — compatible with standard 520-series drive chains
• CNC-Machined Aluminum Construction — significantly lighter than stock steel sprockets for reduced unsprung and rotating mass
• Hard Anodized Finish — resists corrosion and wear for extended service life
• Precision Machined Mounting Holes — direct OEM-style bolt pattern for straightforward installation
• Made in the USA — Vortex Racing quality manufactured domestically

The VTX aluminum rear sprocket is an ideal upgrade for riders looking to fine-tune their motorcycle's gearing ratio. Dropping or adding teeth affects throttle response and top speed, allowing customization for track or street riding conditions. Always replace the drive chain and front sprocket simultaneously when installing a new rear sprocket for optimal drivetrain performance and longevity.