A-Plate Slug 1/4in Offset

The A-Plate Slug 1/4in Offset from JOES RACING PRODUCTS is a precision control arm caster adjustment component engineered for suspension geometry tuning in high-performance and competitive racing applications. This aluminum slug functions as a spacer or shim to fine-tune caster angles, enabling drivers and suspension technicians to dial in optimal steering response and tire contact patch geometry. Designed for vehicles requiring critical suspension adjustments, the A-Plate Slug addresses the real-world need for repeatable, incremental caster corrections without requiring frame modifications or extensive rework.

Manufactured from black anodized aluminum, this component features a 1/2-inch ID hole and a precisely machined 1/4-inch offset that allows controlled caster plate positioning on the upper control arm. The anodized finish provides corrosion resistance and durability under demanding track conditions, while the compact 2 x 0.75 x 3-inch profile and lightweight 0.06 lbs construction minimize unsprung weight penalties. The slotted A-plate design permits fine adjustment capability, enabling suspension specialists to achieve caster angles between standard adjustment limits—critical for maximizing front-end stability during cornering and reducing understeer or oversteer tendencies.

This offset slug benefits race teams, suspension shops, and serious enthusiasts seeking precision control over front-end geometry on vehicles using JOES Racing control arm platforms. Installation requires removal of the upper control arm and integration into the existing caster plate assembly—a straightforward procedure for technicians with basic suspension knowledge. Whether tuning a circle-track machine, autocross competitor, or street performance build, the A-Plate Slug 1/4in Offset delivers measurable improvements in steering feel and tire wear characteristics when paired with a complete suspension geometry setup.