Vortex 251AZKV4-45 V4 520-Pitch 45-Tooth Black Aluminum Rear Sprocket

The Vortex 251AZKV4-45 is a 45-tooth, 520-pitch rear sprocket machined from lightweight aerospace-grade aluminum and finished in a durable black anodized coating. Featuring Vortex's latest V4 sprocket design, this rear sprocket delivers the performance and precision that street riders and racers demand as a direct upgrade over heavy OEM steel sprockets.

Reducing rotating mass at the rear wheel translates directly to improved throttle response, sharper acceleration, and more precise handling — making an aluminum rear sprocket one of the most impactful performance upgrades available for a motorcycle drivetrain.

Key Features:

• 45-Tooth, 520-Pitch — compatible with 520-size OEM chains or suitable 520 conversion setups
• Lightweight aluminum construction — significantly lighter than stock steel sprockets, reducing unsprung and rotating mass
• Vortex V4 design — the latest-generation CNC-machined sprocket profile from Vortex Racing
• Black hard anodized finish — provides corrosion resistance and long-lasting good looks
• Saber tooth groove geometry — unique tooth profile engineered to extend sprocket longevity
• 100% CNC manufactured in the U.S.A. — precision machined to exact tolerances
• Specially formulated alloy — proprietary aluminum alloy specified by Vortex Racing for optimal strength-to-weight ratio

Vortex Racing rear sprockets are a trusted choice for performance street riders, track day enthusiasts, and club racers. Designed for 520-size OEM replacements or compatible 520-pitch chain conversions. Always replace the chain and front sprocket together for best results and maximum drivetrain life.