This lower A-arm spring provides an ultra soft rate for front suspension tuning on Yokomo R12 and compatible GT models. The intention is to reduce the initial spring stiffness at the lower arm so the front end feels more compliant.
Applying this spring can improve front traction on slippery surfaces by smoothing weight transfer, though it can soften steering response. Balance changes with damping and ride height adjustments to retain predictable handling.
Fitment is a direct swap on supported R12/GT lower A-arm assemblies—replace the OEM spring with this unit and run the suspension through its travel to ensure clearance. Fine-tune preload and damper settings after fitment.
Compatibility: GT5-R35, GT5-SC430, GT3-REA, GT3-IS350, GT3-B4, GT3-CAX, GT3-BRZ, GT3-AHP, GT-B, GT5-R2, GT5-RS2, YR-R12C3, YR-R12C31.
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