Vortex 170ZRV4-51 VTX Aluminum Rear Sprocket 51T

The Vortex 170ZRV4-51 is a 51-tooth VTX Series aluminum rear sprocket designed as a high-performance replacement for sport and street motorcycles. Machined from lightweight 7075-T6 aluminum alloy, this sprocket delivers a significant weight savings over OEM steel units without sacrificing durability or performance.

Key Features:

• 51 Teeth — Optimized tooth count for enhanced acceleration and throttle response
• 7075-T6 Aluminum Construction — High-strength aerospace-grade alloy for reduced rotating mass
• Hard Anodized Finish — Provides superior corrosion resistance and extended wear life
• CNC Machined — Precision tolerances for smooth, quiet chain engagement
• VTX Series Design — Vortex's proven bolt pattern and hub configuration for a direct OEM replacement fit
• 170ZRV4 Hub Pattern — Compatible with specific sport bike applications requiring this carrier design

Vortex sprockets are a popular upgrade among sport bike enthusiasts looking to fine-tune gearing for track days or street riding. The 170ZRV4-51 installs using the factory hardware and requires no modification, making it a straightforward bolt-on upgrade. Compatible with standard 520 or 525 chain pitch depending on application — verify chain pitch for your specific fitment.