Yokomo BD9 MID Chassis Topdeck Hard Type 2 Upgrade - Arrowmax AM-910021  [AM-910021]

MID topdeck upgrade for BD9 racers

The AM-910021 AM Medius MID Topdeck from Arrowmax is a 2.0mm Hard Type 2 replacement plate intended for use with the Yokomo BD9 MID chassis. Fitted in the mid area, it changes chassis torsional properties to aid precise handling adjustments.

Designed as a tuning component, this topdeck increases MID-section torsional stiffness to influence steering feedback and cornering balance. It is supplied as a direct-fit hop-up for BD9 MID configurations and is best used as part of a wider setup routine.

Installation notes: this topdeck replaces the MID section using the same mounting points as the OEM AM Medius topdeck for BD9 MID. No extra items are listed as included, so use your existing chassis fasteners and follow recommended torque procedures.

Use the AM-910021 when you need a firmer MID section to fine-tune entry and mid-corner characteristics; adjust suspension and anti-roll settings stepwise to evaluate on-track effects.