The Arrowmax AM-910020 topdeck is an RC-spec replacement tailored to the Yokomo BD9 MID configuration, produced at a 2.0mm thickness. It acts as the upper chassis plate connecting front and rear bulkheads and contributes to the car's torsional stiffness.
Designed with setup in mind, this topdeck lets drivers influence mid-corner balance and how the car responds to sudden inputs by changing deck stiffness rather than suspension geometry. Fit it as a direct replacement where the BD9 MID topdeck is called for to retain mounting accuracy.
Installation is straightforward on conventional BD9 MID cars—remove the current plate, align bolt holes and fasten screws uniformly to preserve planarity. For setup, change the topdeck and perform controlled tests, recording handling notes to isolate stiffness effects on understeer, oversteer and straight-line behaviour.
As an upgrade option for the Yokomo BD9 MID chassis, this topdeck is aimed at drivers who adopt a step-by-step tuning approach; use it to evaluate stiffness changes within a structured setup routine.
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