ATI Performance Products ATI918990-70 Elastomer Ring Kit 6 in. Damper 2-Ring 70 Durometer

The ATI Performance Products ATI918990-70 is a replacement elastomer ring kit designed for ATI Super Damper harmonic balancers with a 6-inch diameter shell and a 2-ring configuration. This kit uses a uniform 70 durometer rating across all ring positions (outer, inner, and face), making it the standard firmness choice for most street and race applications on 6-inch dampers.

ATI elastomer rings are the key vibration-absorbing component inside every ATI Super Damper. Over time, these rings can harden or degrade due to heat cycles, oil exposure, and age — replacing them restores the damper's torsional vibration control performance to like-new condition at a fraction of the cost of a new damper.

Key Features:

• Fits: ATI Super Dampers with 6 in. diameter shells
• Ring Configuration: 2-ring kit
• Durometer: 70 Outer / 70 Inner / 70 Face — standard firmness for most applications
• High-quality rubber construction engineered for performance and durability
• Available in multiple durometers (40, 50, 60, 70, 80, 90) to tune damper characteristics
• Sold as a complete kit — includes all rings needed for a full rebuild
• Manufactured by ATI Performance Products, an industry leader in harmonic damper technology

Choosing the correct durometer is critical to proper damper function. Softer elastomers (lower durometer) absorb vibration at lower RPM ranges, while firmer elastomers (higher durometer) are better suited for high-RPM racing applications. The 70 durometer kit is the factory-standard option for most 6-inch ATI dampers.