DID 520 ERT3 Racing Chain 120-Link Gold — Non-O-Ring, 37 kN Tensile

The DID 520ERT3-120 is a lightweight, 120-link non-O-ring racing chain engineered for increased shock resistance and higher tensile strength without added mass.

This high-performance Ert3 series chain from DID upgrades race-day reliability by combining advanced pin treatment and cold-formed solid bushing technology. It delivers improved shock absorption and wear life compared with the prior Ert2 generation while keeping the overall chain weight steady—ideal for riders seeking stronger, more durable drivetrain components without sacrificing agility.

How does the Ert3 chain improve shock resistance during aggressive riding?

The Ert3 gains roughly 25% better anti-shock performance by using a proprietary pin treatment that forms a hard chromium-carbide surface while preserving a softer inner core. That combination helps the pin resist surface damage yet absorb impact forces that occur under heavy loads or jumps.

• SDH pin treatment creates a hard exterior and ductile interior
• Pin and bushing geometry tuned to reduce shock transmission
• Non-O-ring design minimizes drag for race-focused setups

What makes the chain stronger without adding weight?

DID increased tensile strength by around 5% versus the Ert2 while keeping plate thickness and overall mass unchanged. The result is a 37.0 kN (approximately 8,300 lb) tensile rating achieved through material selection and precision manufacturing rather than bulk.

• 37.0 kN tensile strength for high-load reliability
• 2.0 mm inner and outer plate thickness maintained for weight control
• Optimized pin dimensions: 17.6 mm length and 5.34 mm diameter

How does cold-formed solid bushing technology affect wear life?

Cold-formed solid bushings produce a smooth, round internal surface that resists abrasion and promotes even contact with rollers and pins. The improved roundness and hardness distribution reduce uneven wear, extending usable life under racing conditions.

• Seamless round bushings for consistent contact and less wear
• High wear resistance suited for frequent, high-RPM use
• Designed to maintain chain geometry under stress for longer service intervals

What installation and compatibility details should I know?

The 520ERT3-120 ships as a 120-link non-O-ring chain and includes a clip-style (RJ) master link for assembly. Its 520 pitch is compatible with motorcycles and race setups designed for 520-series chains; check sprocket tooth counts and clearance before fitting.

• Includes clip-style RJ master link for secure joining
• 120 links total — trim to fit per manufacturer instructions
• 520 pitch size; verify sprocket compatibility and chain alignment

Who is this for? The DID 520ERT3-120 is aimed at competitive riders and track-focused enthusiasts who need a race-ready chain that balances lighter weight with higher shock resistance and tensile strength. Choose this chain if you want a durable non-O-ring option built to withstand aggressive riding, frequent high-load events, and the wear demands of performance-oriented drivetrain setups.