RK 420 MXU2 U-Ring Sealed Chain

When conditions turn muddy, sandy, wet, or if riders just want a long lasting racing chain, RK offers a sealed supercross, motocross and off-road racing chain called MXU.

RK’s 520MXU 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 420/428MXU will come with RK’s U-Seal for increased durability without increasing drag. 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 U & UW seals also feature small contact points to reduce cold start drag. U & UW ring thickness is 50% thinner than O-ring with longer life time. MXU is available in 420, 428 and 520 pitch.

GB520MXU Sealed Motocross Chain weighs a mere 3.04 lbs per 100 links making MXU the lightest sealed off-road chain on the market.

• Designed for supercross, motocross and off-road racing in muddy, sandy and wet conditions
• Sealed design helps extend chain life compared to non-sealed chains
• 420/428 models feature RK U-Seals for increased durability with minimal added drag
• 520 models feature ultra-thin UW-Ring seals for narrow-clearance applications
• Triple-barrier grease protection and anti-debris technology reduce internal wear
• Thin U/UW-Ring seals reduce contact points and cold-start drag
• U/UW-Ring seals are 50% thinner than conventional O-rings
• Available in 420, 428 and 520 chain pitches
• GB520MXU weighs just 3.04 lbs per 100 links, making it an exceptionally lightweight sealed off-road chain
• Tensile Strength: 4,540 lbs
• Max CC Rating: 150cc Off-road
• Max Horsepower: 35HP
• Weight: 1.74 lbs
• Max Chain Width: 17.1mm
• Master Link Included: Clip type

Specifications

Part Numbers Specification