This collar is manufactured from aluminum to serve as the upper arm support shim on the YR-10F chassis, intended for 1/10 scale touring car setups.
When placed around the upper arm pivot the part offers a selectable camber offset of 1.0 or 2.5 degrees depending on orientation, which helps hold the arm in a fixed position and increases local rigidity while leaving the rest of the suspension unchanged.
It is intended to make arm location more repeatable after maintenance and to let you implement small camber changes quickly during tuning sessions.
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