This is a 40g center balance weight made for BD8 on-road chassis, supplied as a steel accessory to alter the centre of mass on RC models. The part is intended as an add-on mass to influence handling balance rather than change suspension geometry or other components.
In practical tuning the weight shifts the chassis centre of gravity toward the mounting location, which can help with understeer/oversteer transitions, traction on corner exit, and straight-line stability depending on the overall setup. Its role is strictly as ballast for fine adjustments during track tuning.
Installation is straightforward when compatible mounting points are available on the BD8 chassis; the weight is designed to sit at the vehicle centreline so it affects fore-aft and lateral balance predictably. Remove or relocate the part to compare handling changes before committing to other setup changes.
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