This aluminum collar is made for the upper arm support on the YR-10F chassis and functions as a camber shimming element for scale 1/10 touring car setups.
Installed around the upper arm pivot, the collar sets camber to 1.0° or 2.5° depending on mounting orientation, helping to stabilise the upper arm location and increase local rigidity without altering other suspension parts.
The design is intended to improve repeatability of arm positioning during rebuilds and to make small camber changes quick to implement during setup or cornering balance work.
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