D.I.D. 520ERT3 Non-Sealed Motocross Chain

The D.I.D. 520ERT3 non-sealed motocross chain is a lightweight, low-friction racing drive chain built for competition. D.I.D. calls it its best-selling motocross chain. Factory race teams use it, and it suits riders who want a strong, light chain for motocross and closed-course racing.

Key Features:

• Non-sealed (non O-ring) design: It runs with less drag and weighs less than a sealed chain, so power delivery stays responsive.
• Race-bred strength: D.I.D. rates it with about 25% greater anti-shock performance and about 5% higher tensile strength than the previous-generation chain, with no added weight.
• Strength-to-weight ratio: It is a popular choice across many racing disciplines, especially in the 250 class.
• Built for motocross: It is designed for racing use on motocross bikes up to 450cc.
• Manufacturer quality: D.I.D. is a long-established Japanese chain maker.

Non-sealed chains need regular cleaning, lubrication and adjustment. They are usually replaced together with the sprockets as part of routine race-bike maintenance. The 520ERT3 is a good fit for riders who put low weight and fast throttle response ahead of maximum service life.