RK Excel GB428MXU-120 MXU Gold Drive Chain, 428 Pitch, 120 Links

RK’s MXU features ultra-thin UW-seals which is perfect for bikes with narrow clearance and delivers triple the life expectancy when compared to a non-sealed chain. RK’s UW-Ring seals utilize triple barrier grease protection plus anti-debris technology. Anti-debris protection is vitally important to maximize chain wear life by eliminating debris friction between internal components. RK’s UW seals also feature small contact points to reduce cold start drag. UW ring thickness is 50% thinner than O-ring with longer life time. MXU is currently available in 520 pitch

The RK Excel GB428MXU-120 MXU Gold Drive Chain is engineered for off-road motorcycles and other powersports applications using a 428 chain size. Its ultra-thin UW seals are designed for bikes with narrow chain clearance while providing significantly longer service life than a comparable non-sealed chain. The chain is rated for applications up to 150cc and 35 horsepower, making it a practical choice for lightweight dirt bikes and off-road machines.

RK Excel’s UW-Ring seal system combines triple-barrier grease protection with anti-debris technology to help reduce contamination and internal friction. By limiting debris intrusion between the chain’s internal components, the seal design helps maximize wear life. Small seal contact points also help reduce drag during cold starts, while the UW ring is substantially thinner than a conventional O-ring for improved clearance without sacrificing durability.

Fitment: The GB428MXU-120 is intended for compatible 428-pitch drive systems and is suitable for select off-road motorcycles and powersports vehicles rated within its application limits. Verify the original equipment chain size, required link count, sprocket compatibility, and manufacturer fitment specifications before installation. This RK Excel chain includes a clip-type master link for installation.

Manufacturer: RK Excel
Brand: RK EXCEL
Part Number: GB428MXU-120
Vendor Part Number: GB428MXU-120

Features:

• Chain Size: 428 pitch for compatible motorcycle and powersports drive systems
• Model: MXU sealed drive chain
• Finish: Gold outer plates for corrosion resistance and a distinctive appearance
• Seal Design: Ultra-thin UW-Ring seals with triple-barrier grease protection
• Anti-Debris Technology: Helps reduce contamination and friction between internal components
• Application Rating: Suitable for select off-road applications up to 150cc and 35 horsepower
• Tensile Strength: 6,070 pounds
• Link Count: 120 links
• Master Link: Clip-type master link included
• Clearance Design: Thin seal profile supports applications with narrow chain clearance
• Brand: RK EXCEL
• Manufacturer Part Number: GB428MXU-120
• Vendor Part Number: GB428MXU-120