TRF421X Chassis Battery Weight 3451597 by Tamiya  [3451597]

Overview of the TRF421X Battery Weight

The Tamiya 3451597 battery weight, recorded as part 42391, is an accessory intended for the TRF421X chassis. It functions as a battery-area mass insert to adjust balance and handling without altering key chassis components.

Fitment is specific to TRF421X platforms; verify your battery tray layout before fitting. The component is intended to sit in or next to the battery bay to change the centre of mass for precise tuning of front/rear bias and transient response during acceleration and directional shifts on circuit surfaces.

To install on supported TRF421X configurations: remove the body shell and battery, identify the allocated battery-slot, place the weight in the recommended location, and fasten it using existing screws or mounting points. Avoid modifying chassis hardware beyond routine service tasks, and ensure wiring and battery straps are routed clear of the added mass.

Practical tuning advice: minor adjustments to battery-area mass can influence understeer and oversteer balance and affect the way traction transfers rather than altering peak grip. Apply weight progressively and log positions so settings can be repeated or reversed. This part is designed for measured balance tuning rather than structural alteration.

Owners of TRF421X chassis who want controlled adjustments to handling will find this battery weight a straightforward tool to manage mass distribution without swapping major parts.