Vortex CK6138 GFRS GoFast 520 Street Chain and Sprocket Kit 15/44T Steel

The Vortex CK6138 GFRS GoFast 520 Street Chain and Sprocket Kit is a complete, ready-to-install drivetrain upgrade delivering enhanced acceleration and long-term durability. This kit includes a laser-cut steel rear sprocket and a Vortex RX3 520 chain pre-cut to 116 links — no chain cutting required for a straightforward installation.

The kit is geared one tooth down in front (15T) versus the OE 16T front sprocket, while retaining the stock 44T rear sprocket. This revised 15/44 ratio sharpens throttle response and improves low-end acceleration compared to the factory 16/44 configuration.

Chain Features:

• Made in Japan to the highest quality specifications in the industry
• Dual pocket sealing system delivers up to 7 times longer wear life versus standard O-ring chains
• 8,800 lb. tensile strength rating
• Rivet-type master link included; clip-type master link available separately
• 520 pitch, 116-link length, black finish

Steel Rear Sprocket Features:

• Laser-cut high carbon steel construction for maximum strength
• Induction hardened teeth for reduced surface wear and maximum service life
• Special nickel plating for corrosion resistance
• Drilled lightening holes to reduce rotating mass
• Cupped body design minimizes weight without sacrificing strength
• Precise tolerances ensure proper concentricity
• Black satin electro-plated finish for corrosion resistance

Kit Specifications:

• OE Gearing: 16/44
• Kit Gearing: 15/44
• Chain Type: Vortex RX3 520
• Chain Links: 116
• Rear Sprocket Material: Steel
• Rear Sprocket Teeth: 44T
• Front Sprocket Teeth: 15T

The Vortex CK6138 is a complete chain and sprocket kit solution for riders seeking improved street performance with a proven, race-proven drivetrain brand.