RK 520 MXU UW-Ring Sealed Racing Chain – 114 Links | 125cc–500cc

RK 520 MXU Sealed Racing Chain – 114 Links

The RK 520 MXU UW-Ring sealed racing chain is the lightest sealed-ring chain on the market, purpose-built for high-speed motocross and off-road racing. At just 3 lbs per 100 links, it delivers a measurable weight advantage without sacrificing tensile strength or durability — critical for competitive riders running 125cc to 500cc engines.

RK's proprietary UW-Ring seal technology locks in lubricant and blocks out dirt, mud, and moisture, dramatically extending chain life compared to standard O-ring chains. The result: consistent power transfer lap after lap, with less maintenance between races.

Key Features

• Lightest sealed-ring racing chain available — optimized for weight-sensitive race builds
• UW-Ring seal design retains lubrication and resists contamination
• High tensile strength engineered for demanding 125cc–500cc racing applications
• Includes clip connecting link for fast, secure installation
• Compatible with standard 520 sprocket setups

Specifications

• Brand: RK
• Part Number: GB520MXU-114
• Chain Size: 520
• Links: 114
• Weight: 3.61 lbs
• Ring Type: UW-Ring (sealed)
• Compatible Engine Range: 125cc – 500cc
• Connecting Link: Clip type (included)
• Barcode (UPC): 681319461685

Whether you're prepping for race day or replacing a worn chain mid-season, the RK 520 MXU delivers the performance, reliability, and weight savings that serious riders demand.