Yokomo R12-10U Upper A-arm for R12/GT Series  [R12-10U]

Replacement upper arm for Yokomo R12/GT

This upper A-arm is supplied as a standard service part for the Yokomo R12/GT family. It is designed as a direct-fit swap to replace worn or damaged upper arms and to assist with routine setup adjustments during chassis tuning. The notes below outline compatibility, fitment guidance, and the component's influence on suspension geometry.

Compatibility applies only to the R12/GT variants listed here. Verify your chassis code before ordering to ensure the arm's mounting holes and ball stud positions match your car.

Supported chassis: GT5-R35, GT5-SC430, GT3-REA, GT3-IS350, GT3-B4, GT3-CAX, GT3-BRZ, GT3-AHP, GT-B, GT5-R2, GT5-RS2.

Installation notes: Fit this A-arm using the chassis original fasteners and ball studs. When replacing, inspect the hinge pin and bushings for wear and check suspension alignment (camber and toe) after installation. Tighten fasteners to the vehicle manufacturer's recommended torque and ensure the suspension moves freely through its travel.

Tuning role: Upper arm condition and geometry influence camber gain, roll center height, and steering return behavior. Replace this part to restore baseline geometry before making finer adjustments to shocks, sway bars, or toe links.