TRF421 Rear Stiffener for TRF421X / TRF421 - Tamiya 3404177  [3404177]

Rear chassis stiffener for TRF421 models

This rear stiffener is an RC hop-up made for the TRF421 line, designed to increase the rear section's stiffness so you can fine-tune handling. It alters how the rear reacts during acceleration, turn-in and traction changes, helping drivers adjust balance without reworking suspension geometry.

The component attaches to the TRF421 rear chassis area and is intended for use with normal hop-up and maintenance routines. Because it changes chassis rigidity rather than suspension travel, it is normally used in combination with stepwise shock, spring or anti-roll bar adjustments to achieve the desired handling character.

Tuning tips: adding the rear stiffener usually tightens rear grip and lessens chassis flex; try it to reduce oversteer or to stabilise the car through fast sweepers, then fine-tune damping and roll centre to restore overall balance.