We’re excited to announce the release of our new Circuit Sports Upper Control Arm Ball Joint Replacement for the Mazda Miata NA (1990–1997). 

Over time, the dust boots on OE ball joints can deteriorate, allowing dirt and contaminants to enter the joint. This can lead to clunking noises, vibration, and excessive tire wear. Our new upper ball joints are manufactured using high-quality components and are built and assembled by an ISO9001:2000 certified manufacturer. Features include forged housing and stud construction, high-quality rubber dust boots, and an oxidation/corrosion-resistant coating. Each unit is manufactured to tight tolerances, providing approximately 25% stiffer ball stud performance compared to OE, while als o improving durability and longevity.

These new products are now in stock and ready to ship; Sold as a pair (includes two upper ball joints).

The NB version will be released shortly after.