Yokomo BD9 MID Topdeck Upgrade 2.0mm Hard Type - Arrowmax AM-910021  [AM-910021]

Mid-section topdeck for Yokomo BD9 MID

The Arrowmax AM-910021 AM Medius MID Topdeck is a 2.0mm Hard Type 2 replacement plate made for the Yokomo BD9 MID chassis. It installs in the mid position to change torsional behaviour and tune the chassis stiffness profile.

Use this topdeck as a tuning item to raise torsional rigidity in the MID area, which can sharpen steering response and shift balance through lap work. It is supplied as a direct-fit hop-up for the BD9 MID layout and should be treated as a chassis-level tuning piece rather than a standalone power upgrade.

Installation notes: this part swaps into the MID topdeck location and uses the same mounting points as the original AM Medius MID topdeck for BD9. No extra hardware is listed as included, so reinstall existing fasteners and follow the chassis manufacturer's standard fastener pattern and torque guidelines.

Fit this topdeck when you want a firmer MID section to refine handling; combine it with small suspension or anti-roll changes to evaluate effects on corner entry and mid-corner grip.