Vortex CK4140 520RV3 Chain and Sprocket Kit 16/40 Steel GoFast

The Vortex CK4140 is a complete GoFast Steel (GFRS) 520 chain and sprocket kit engineered for riders looking to sharpen throttle response with a one-tooth-down front sprocket gearing change. The kit arrives ready to install with no chain cutting required, making it a straightforward bolt-on upgrade over the stock drivetrain.

At the heart of this kit is the Vortex 520RV3 chain, manufactured in Japan to meet the highest industry quality standards. The RV3 Series chain features a dual pocket sealing system that retains lubrication more effectively than conventional designs, delivering up to 7 times longer wear life compared to standard O-ring chains. All chains in Vortex kits include a rivet-type master link for secure, race-proven connection (clip-type master links are also available and sold separately).

Kit Contents:

• Front Sprocket: Vortex 3270-16 — 16-tooth steel countershaft sprocket
• Rear Sprocket: Vortex 452AS-40 — 40-tooth laser-cut steel rear sprocket
• Chain: Vortex 520RV3-108 — 520-pitch, 108-link sealed chain with dual pocket sealing
• Rivet-type master link included

Gearing Specifications:

• OE Gearing: 17/40 (ratio 2.35)
• Kit Gearing: 16/40 (ratio 2.50) — one tooth down in front, stock rear
• Chain: 520RV3 — 108 links

Dropping one tooth on the front sprocket increases the overall gear ratio, translating to quicker acceleration and stronger low-to-mid range throttle response. The laser-cut steel rear sprocket ensures precise tooth geometry for smooth, efficient power transfer and long service life. Vortex chain and sprocket kits are a trusted choice for street riders and track day enthusiasts seeking a quality, performance-matched drivetrain upgrade.