Tamiya 3404177 - Rear Stiffener for TRF421X TRF421 Hop-up  [3404177]

Rear stiffener for TRF421 family

This is an RC-scale rear stiffener designed for the TRF421 hop-up line, intended to alter rear chassis rigidity for finer handling adjustments. It serves as a tuning piece that changes how the rear section reacts under acceleration, cornering and traction transitions, allowing drivers to dial in balance without altering suspension geometry.

The part mounts to the rear section of the TRF421 chassis and is used alongside standard hop-up and maintenance procedures. Because it modifies chassis stiffness rather than suspension travel, it is generally paired with incremental shock, spring or anti-roll bar changes to reach the desired handling behaviour.

Tuning notes: fitment of a rear stiffener typically tightens rear traction and reduces chassis flex; use it to address oversteer tendencies or to stabilise the rear on high-speed sweepers, then re-evaluate shock damping and roll centre settings for a balanced setup.