About Us
About ASR Parts
A-SPEC Racing — Precision-engineered suspension solutions for performance Hondas and Acuras.
Founded in 2005, ASR began when founder Charleston adapted NASCAR torsion-beam principles to create a high-stiffness rear anti-roll bar for his 1999 Civic EX. The goal was clear: reduce understeer and sharpen yaw response on track. Extensive testing on Southern California roads and circuits validated the design, and demand from other drivers quickly followed.
Today, every ASR component is designed in-house with advanced CAD and manufactured on HAAS CNC machines at our Chatsworth, California facility. This vertical integration ensures tight control over geometry, material properties, and tolerances under sustained high lateral loads.
A primary engineering challenge on many 1990s Honda and Acura chassis is the thin-gauge rear subframe, which can deform or tear when fitted with a larger anti-roll bar. ASR’s subframe reinforcement brace solves this by redistributing loads through the lower control arm bolt, tying the subframe ends with a high-strength billet plate, and using contoured billet backing plates to minimize stress concentrations.
ASR’s subframe braces and hollow anti-roll bars have become the most popular choice among Honda and Acura competitors in club racing, professional racing, and HPDE. Every product is prototype-tested across varied track conditions to deliver measurable gains in handling precision and long-term durability.
Manufacturing and Testing at ASR
ASR designs its high-performance automotive products using cutting-edge CAD software and manufactures them in the USA with state-of-the-art HAAS CNC machines for precision and quality. Every product undergoes rigorous prototype testing on diverse race tracks to ensure top-tier performance and reliability. As a result, the ASR brace and anti-roll bar have earned their place as the preferred choice for dedicated enthusiasts and racers worldwide.
ASR Product Development
ASR Subframe Brace Design for Honda and Acura Vehicles
Upgrading to a larger rear anti-roll bar is a highly effective way to reduce understeer in front-wheel-drive cars, particularly for performance driving. However, many Honda and Acura models from the 1990s, constructed with thinner-gauge steel, are prone to rear subframe damage when equipped with a larger anti-roll bar. The ASR subframe reinforcement brace addresses this issue by significantly reducing the risk of subframe tearing through a robust, carefully engineered design.
Design Features
- Load Distribution: The brace minimizes stress on the anti-roll bar attachment points by distributing forces across a wider area, using the lower control arm bolt as a secure anchoring point.
- Signature Billet Plate: A wide, high-strength billet plate ties the subframe ends together, stabilizing all mounting points and preventing movement under load.
- Contoured Billet Backing Plates: Precision-machined backing plates further reduce stress at the subframe mounting points, enhancing durability.
Benefits
These design elements collectively reduce the stress imposed on the subframe when a larger rear anti-roll bar is installed, ensuring greater reliability and performance for enthusiasts and racers.