Vortex 151ZR-38 CAT5 M-Tooth 420 Rear Sprocket Red 38-Tooth

The Vortex 151ZR-38 is a CAT5 M-Tooth 420 pitch rear sprocket featuring 38 teeth in a striking red anodized finish. Engineered for mini bikes and small-displacement motorcycles running a 420 chain, this sprocket delivers the precision and durability Vortex is known for in motorsports.

Key Features:

• 420 Chain Pitch — designed for 420-size chain applications
• 38 Teeth — part of the 151ZR series available in a wide tooth-count range for gear ratio tuning
• CAT5 Anodized Red Finish — electrically coated for a bright, durable appearance and corrosion resistance
• Aluminum Construction — lightweight material reduces rotational mass for improved performance
• M-Tooth (Saber Tooth) Design — Vortex's proprietary tooth profile extends sprocket longevity and improves chain engagement
• 100% CNC Machined — precision manufacturing ensures consistent fitment and concentricity
• Vortex Patent-Pending Design — cupped-down face reduces weight without sacrificing strength

The 151ZR series is a popular choice for mini moto and pit bike applications, including platforms such as the Cobra CX65. Upgrading or fine-tuning your gear ratio with a Vortex rear sprocket is a straightforward way to optimize acceleration or top-end speed to match your riding style or track conditions.