Tamiya 3451597 - Battery Weight for TRF421X Chassis  [3451597]

Battery weight for TRF421X

This RC-scale accessory is the Tamiya 3451597 battery weight, referenced as part 42391, produced for use with the TRF421X chassis. It functions as a dedicated battery-area mass insert to influence balance and handling characteristics without altering major chassis components.

Compatibility is focused on the TRF421X platform only, so confirm battery tray layout before fitting. The unit is intended to sit in or near the battery bay to adjust the centre of mass for close-range tuning of forward/rear bias and transient response during acceleration and direction changes on track.

Installation is straightforward on supported TRF421X layouts: remove the body and battery, locate the designated battery-slot area, seat the weight in the recommended position, and secure it using existing chassis screws or mounting points. Do not modify the chassis hardware beyond standard servicing steps, and ensure wiring and battery straps are routed clear of the inserted mass.

Tuning notes: small changes to battery mass distribution affect understeer/oversteer balance and traction transitions more than absolute grip. Use the weight incrementally and test changes on consistent surfaces, documenting positions so settings can be reverted. This part is intended for precise RC-scale balance adjustments rather than structural modification.

For TRF421X users seeking measured changes to chassis behaviour, this battery weight offers a direct way to tune mass distribution without replacing major components.