Vortex CK5263 520 GFRA Go Fast Conversion Chain and Sprocket Kit

The Vortex CK5263 is a complete 520 GFRA (Go Fast) conversion chain and sprocket kit designed to deliver quicker acceleration through a shorter front sprocket gear ratio. This ready-to-install kit includes a pre-cut chain — no chain cutting or modification required right out of the box.

At the heart of this kit is the Vortex 520RV3 chain, manufactured in Japan to exacting quality standards. The RV3 Series chain features an advanced 3-pocket sealing system that delivers up to 10 times the wear life of standard O-ring chains, providing outstanding durability and reduced maintenance intervals for street and track riders alike.

The kit includes a hardcoat aluminum rear sprocket — finished with a PTFE coating over hard anodizing for added lubricity and long-term durability — paired with a chromoly-steel front sprocket. Together, these components deliver optimal power transfer and reduced rotating mass compared to a standard OEM steel drivetrain setup.

Gearing Specifications:

• OE Gearing: 17 front / 43 rear
• Vortex Kit Gearing: 16 front / 43 rear (one tooth down in front, stock rear)
• Chain Type & Length: 520RV3 — 112 links
• Chain Pitch: 520 (narrower and lighter than OEM)

Kit Includes:

• 1x Vortex chromoly-steel front (countershaft) sprocket — 16T
• 1x Vortex F5 hardcoat aluminum rear sprocket — 43T
• 1x Vortex 520RV3 chain — 112 links, pre-cut to length
• Rivet-type master link

The shorter front sprocket ratio provides improved low-end torque and faster acceleration off the line compared to stock gearing. Riders should compare OE gearing to Vortex kit gearing to verify gear ratio differences before purchase. The 520 conversion chain and sprockets are narrower and lighter than standard OEM components, contributing to overall weight savings and reduced gyroscopic forces.