This is an RC-scale 4.5mm wheel spacer designed for the YZ-2 family and related Yokomo 2WD off-road chassis. It ships as a small tuning accessory that changes the effective track width when fitted between the wheel hex and wheel hub.
Installation is straightforward: remove the wheel, place the spacer onto the wheel hex or hub as required, then re-fit the wheel and tighten to the vehicle's normal torque. Because this product comes as a pair, you can fit both sides of an axle to maintain symmetry.
Use this spacer to alter handling balance and tyre scrub geometry in small increments; typical use cases include fine adjustments for cornering clearance or preventing tyre rub on body mounts. Verify clearance at full steering lock and under suspension droop after installation.
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