Yokomo BD9 MID 2.0mm Topdeck by Arrowmax AM-910021  [AM-910021]

MID topdeck for Yokomo BD9

The AM-910021 AM Medius MID Topdeck is a replacement topdeck designed for the Yokomo BD9 MID chassis. The unit is specified as 2.0mm, Hard Type 2, and serves as a mid-position structural plate that interacts with the chassis to alter torsional characteristics.

Functionally this topdeck is intended for tuning: increasing overall torsional stiffness in the MID section of the chassis to influence steering response and balance during lap work. It is presented as a direct-fit hop-up for the BD9 MID layout and is best considered a chassis-level tuning component rather than an isolated performance upgrade.

Installation notes: the part replaces the MID topdeck section and uses the same mounting points as the original AM Medius topdeck for BD9 MID configurations. No additional items are listed as included, and installation should follow the chassis manufacturer’s standard fastener pattern and torque practice.

Use this topdeck when you need a stiffer MID section to fine-tune handling; pair it with incremental suspension and anti-roll adjustments to evaluate changes in corner entry and mid-corner behavior.