EK 520 H/Duty Motocross Chain 120L (10)

Meet the EK 520 H/Duty Motocross Chain 120L (10) — built for riders who demand unwavering performance when the track gets rough. This 520-size chain is purposefully engineered to withstand the brunt of aggressive riding, big jumps, and muddy, sandy conditions that define off-road motocross.

With a precise 120-link length, this chain suits a wide range of motocross setups that require a robust, high-torque drivetrain. It’s designed to deliver smooth, reliable power transfer from engine to rear wheel, helping you accelerate confidently, land cleanly, and maintain control through challenging terrain.

Why the H/Duty design matters

• Heavy-duty construction — reinforced links and hardened components stand up to high-torque bursts and brutal landings, reducing fatigue and stretch over time.
• Enhanced durability in dirty environments — seals and protective coatings resist dirt, mud, and water, helping to extend chain life in the muddiest rides.
• Consistent performance — tight tolerances and robust wear surfaces mean smoother operation and predictable power delivery ride after ride.

Ideal for whom and when

• Riders on mid-to-large displacement motocross bikes running a 520-chain setup
• Competitors and weekend warriors who push hard on track, scrambles, and enduro-style courses
• Anyone seeking longer chain life and dependable performance in harsh riding conditions

What problems it solves

• Helps minimize chain stretch and slop under aggressive clutching and heavy landings
• Improves durability in dirt, water, and abrasive environments common to motocross
• Delivers steadier throttle response and smoother power transfer during fast sections and tight corners

Practical tips for maximum longevity

For best results, pair the EK 520 H/Duty chain with proper sprockets and maintain a regular lubrication routine tailored to your riding conditions. After muddy sessions, clean the chain thoroughly and re-lubricate to reduce wear. Check chain tension and alignment periodically to avoid excess wear on pins and links, and replace the chain if you notice significant elongation or stiff spots.

In short, the EK 520 H/Duty Motocross Chain 120L (10) is built for riders who demand reliability, resilience, and immediate, responsive power on tough tracks. If you’re upgrading a 520-chain setup for heavy-duty use, this chain delivers the durability and performance you need to ride with confidence.