Tamiya 3451597 Precision Battery Weight for TRF421X  [3451597]

TRF421X Balance Tuning Weight

This RC accessory is the Tamiya 3451597 battery weight, listed as part 42391, made for fitting to the TRF421X chassis. It operates as a battery-area mass insert to refine balance and handling characteristics while leaving main chassis elements unchanged.

Designed specifically for TRF421X platforms, confirm tray and strap layout prior to fitting. The component is placed in or near the battery compartment to adjust the centre of mass, enabling close-range tuning of front/rear bias and transient behavior during acceleration and directional changes.

Installation on compatible TRF421X layouts is simple: remove the body and battery, locate the battery-slot, position the weight, and secure it using existing screws or mounting points. Avoid altering chassis hardware beyond standard maintenance, and ensure wiring and battery straps remain clear of the inserted mass.

Notes on setup: modest changes to battery mass distribution influence understeer versus oversteer and the way traction transfers, rather than absolute grip. Introduce mass gradually and test consistently, logging locations so you can return to prior settings. This item is intended for precise balance tuning, not structural modification.

TRF421X racers seeking detailed balance adjustments will find this battery weight a direct way to tune mass placement without swapping major components.