This is a dedicated lower A-arm front spring for Yokomo R12/GT series chassis, specified as a super soft rate to give a very compliant front end response on compatible R12 platforms.
Its tuning role is narrow and clear: reduce front spring stiffness to increase compliance, assist weight transfer at low speeds, and help dial in bite and turn-in for track or drift settings where a softer front end is desired.
Compatibility is limited to the listed R12/GT chassis variants; fitment is intended at the lower A-arm spring location used on these models.
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