Vortex 817ZK-50 CAT5 Aluminum Rear Sprocket 50-Tooth 520 Pitch

The Vortex 817ZK-50 is a 50-tooth CAT5 aluminum rear sprocket designed for 520 chain pitch applications. Engineered by Vortex Racing — a trusted name in high-performance motorcycle drivetrain components — this sprocket delivers a precise balance of lightweight construction and durable power transfer for both street and track use.

Key Features:

• 50-tooth rear sprocket for aggressive gearing tuning and improved low-end acceleration
• CAT5 aluminum construction — lightweight aerospace-grade material reduces rotational mass
• 520 chain pitch compatibility
• Hard-coat anodized finish for enhanced wear resistance and corrosion protection
• CNC-machined to tight tolerances for precise fit and concentricity
• Laser-engraved Vortex logo

The 817ZK-50 allows riders to fine-tune their gear ratio for quicker acceleration and improved response out of corners. Vortex sprockets are a direct upgrade over OEM units, offering reduced weight and longer service life when properly maintained.