Tamiya 3451593 14mm Weight (2.5g) hop-up for TRF421X chassis  [3451593]

TRF421X balance weight

This Tamiya 3451593 is a 14mm hop-up weight specified at 2.5g, produced for use with the TRF421X touring chassis. It is an RC-scale accessory intended to alter small changes in front/rear weight distribution for 1/10 touring models, helping with micro adjustments during chassis setup.

Fitment is specific to the TRF421X hop-up locations, so verify the part code when ordering replacements or spares. The part functions as a tuning component rather than a mechanical upgrade, letting drivers make incremental balance changes without modifying suspension or drivetrain parts.

Installation is straightforward for experienced model technicians: remove the factory weight or existing hop-up component from the TRF421X mounting area and fit this 14mm weight in the same position using the original fasteners. Keep fasteners secure and re-check alignment after a short run to confirm desired balance changes.

For tuning, use this weight to nudge handling toward increased front grip or rear stability depending on placement and combination with other hop-ups. Small mass changes like 2.5g are best used alongside track testing and incremental setup logs to assess their effect on corner entry and mid-corner balance.