1990-1997 Mazda Miata NA Upper Ball Joints - Circuit Sports

Circuit Sports Upper Ball Joints – Mazda Miata NA (1990–1997) Only A simple, high-quality solution for worn factory upper ball joints on the NA Miata. These Circuit Sports upper ball joints are a direct bolt-on replacement designed to restore proper suspension function and steering precision without replacing the entire control arm. As original ball joints age, the dust boots can crack and allow contaminants into the joint, leading to clunking under braking, vague steering response, and uneven tire wear. This upgraded replacement is manufactured to tighter tolerances for improved durability and a more precise front-end feel. Each unit also features a serviceable Zerk grease fitting, allowing fresh grease to be injected into the bearing housing to reduce friction and help push out old, contaminated grease. Features: • Forged housing and ball stud • High-quality rubber dust boot • Silver zinc corrosion-resistant coating • Serviceable design with Zerk grease fitting • Approximately 25% stiffer than OEM Includes high-grade mounting hardware and cotter pins for straightforward installation. Fitment: Mazda Miata NA (1990–1997) Sold as a pair.