Vortex 190ZK-55 Aluminum Rear Sprocket 55-Tooth

The Vortex 190ZK-55 is a 55-tooth aluminum rear sprocket designed for performance street and stunt motorcycle applications. Engineered by Vortex Racing, a trusted name in motorcycle drivetrain components, this sprocket delivers reliable power transfer and reduced unsprung weight compared to steel alternatives.

Key Features:

• 55-Tooth count — ideal for increased low-end torque, acceleration, and stunt riding applications
• Premium 7075-T6 aluminum construction — high-strength aerospace-grade alloy balances durability with reduced rotational mass
• Silver anodized finish — provides corrosion resistance and a clean appearance (Vortex sprockets size 55+ are available in silver)
• Precision CNC machined — ensures accurate tooth geometry for smooth chain engagement and extended wear life
• Vortex patented tooth profile — unique design promotes longer sprocket and chain life
• Direct OEM-style bolt-on fitment — no modifications required for compatible applications

The 190ZK-55 is part of Vortex Racing's extensive rear sprocket lineup, engineered for riders who want to dial in their gear ratio for improved acceleration and overall performance. Whether used on the street, track, or for stunt riding, this sprocket is a high-quality upgrade or replacement for your motorcycle's stock rear sprocket.