RK 420 MXZ4 Heavy-Duty Motocross Chain – 120 & 134 Link | Honda Grom, Monkey, CRF110, KLX110

RK 420 MXZ4 Heavy-Duty Motocross Chain

The RK 420 MXZ4 is a purpose-built motocross chain engineered for high-stress off-road and pit bike applications. Featuring chromoly steel construction with seamless rollers, seamless bushings, and oversized alloy pins, the MXZ4 delivers exceptional tensile strength and wear resistance over standard 420 chains.

Key Features

• Chromoly steel construction — superior strength-to-weight ratio over standard carbon steel chains
• Seamless rollers and bushings — reduced friction and extended service life
• Oversized alloy pins — added shear strength for high-load applications
• Includes clip-style master link for easy installation
• Weight: 2.5 lbs per chain

Available Lengths

• 120 Links (SKU: GB420MXZ4-120)
• 134 Links (SKU: GB420MXZ4-134)

Compatibility

• Honda CRF110 (2019+)
• Honda Grom (OG & SF)
• Honda Monkey (1st Gen, 2022+ / JC92)
• Kawasaki KLX110
• Kawasaki Z125
• SSR TNT135
• Fits all 420-pitch drive systems — verify link count before ordering