Vortex CK6237 Chain and Sprocket Kit Conversion with Hardcoat Aluminum Rear Sprocket - 520

The Vortex CK6237 is a complete chain and sprocket kit designed for riders looking to improve acceleration through a gear ratio change. This ready-to-install kit requires no chain cutting and includes everything needed for a direct swap, making installation straightforward for home mechanics and professional technicians alike.

Chain Technology:

• Vortex 520RV3 SV3 Series chain — 116 links
• Manufactured in Japan to industry-leading quality specifications
• Features a dual pocket sealing system for superior lubrication retention
• Delivers up to 7× longer wear life compared to standard O-ring chains
• 520 pitch — part of Vortex's GFRA (Go Fast) conversion lineup

Sprocket Specifications:

• Front sprocket: 15 teeth (one tooth down from OE 16T)
• Rear sprocket: 43 teeth (one tooth down from OE 44T) — hardcoat aluminum
• OE Gearing: 16/44
• Vortex Kit Gearing: 15/43
• Lower gear ratio tuned for improved throttle response and faster acceleration

Kit Contents:

• 1× Vortex 520RV3 SV3 Series chain (116 links, pre-cut, no trimming required)
• 1× Front (countershaft) sprocket — 15T steel
• 1× Rear sprocket — 43T hardcoat aluminum

Vortex sprocket kits are a popular performance upgrade for sport and naked bike riders seeking sharper acceleration without sacrificing drivetrain durability. The SV3 sealed chain and hardcoat aluminum rear sprocket offer an excellent balance of lightweight performance and long service life.