Vortex 617ZR-45 Black Aluminum Rear Sprocket 45-Tooth

The Vortex 617ZR-45 is a 45-tooth CNC-machined aluminum rear sprocket finished in Vortex's signature black anodized ZR series with bright silver machined accent highlights. Engineered for performance-oriented riders, this sprocket is precision-manufactured in the USA from a specially formulated CAT5 aluminum alloy developed to Vortex's exact specifications.

Key Features:

• 45-tooth rear sprocket for fine-tuned gearing adjustments
• ZR Series — black anodized finish with machined silver accent highlights
• Lightweight CAT5 aluminum alloy formulated per Vortex specifications reduces rotating mass
• 100% CNC manufactured in the U.S.A. for precise tolerances and consistent fit
• Vortex patented tooth profile design for extended sprocket longevity and smooth chain engagement
• Direct bolt-on replacement — no modifications required

By reducing rotating mass compared to a steel OEM sprocket, the 617ZR-45 helps put more power to the pavement and allows riders to fine-tune their final drive ratio for improved acceleration response. The striking black and silver finish adds a premium look to the drivetrain while the durable anodizing resists corrosion and wear.