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

Overview: upper A-arm for R12/GT

This replacement upper A-arm is offered as a standard service component for the Yokomo R12/GT family. It installs as a direct-fit part for worn or broken arms and assists with routine setup changes during chassis tuning. The following text covers fitment advice, installation points, and how the arm contributes to suspension geometry.

Compatibility is restricted to the R12/GT variants listed. Verify your chassis model before purchase to be sure the arm aligns with existing mounting points and ball stud locations.

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: This A-arm fits using the chassis original fasteners and ball studs. During replacement, check the hinge pin and bushings for wear and re-establish suspension alignment (camber and toe) after fitting. Torque fasteners to the vehicle manufacturer's specification and confirm the suspension travels freely.

Tuning role: Condition and geometry of the upper arm affect camber gain, roll centre height, and steering return. Fit this part to restore baseline suspension geometry prior to more detailed adjustments such as shock valving or toe changes.