M4WD-39/BL competitive cuboid weight 9g by 3Racing  [M4WD-39/BL]

Performance oriented cuboid mass damper M4WD-39/BL

The M4WD-39/BL is a compact 9 gram cuboid mass damper supplied in black for Mini 4WD chassis tuning. As an aftermarket accessory it provides a small, consistent mass increment for precise centre of gravity and pitch adjustments. No mounting hardware is provided, so secure mounting must be engineered to suit the chosen chassis and setup.

In competitive tuning this block is used to alter local inertia and refine transient responses during jumps and corner transitions. Its net effect is a function of mass location, chassis geometry, and roller configuration, so approach changes incrementally and log the effects across test runs.

Installation notes for tuners: verify internal clearance, avoid contact with rollers or guide stays, and select a mounting method that maintains repeatable placement for testing. Confirm fitment on the target Mini 4WD chassis before permanent attachment.