For Tamiya TRF421X: Split Rear Upper Deck, 2mm Graphite Insert - O-TCP012 by Factory Pro  [FP-O-TCP012]

Rear upper deck insert engineered for TRF421X

The Factory Pro O-TCP012 rear upper deck is an aftermarket, scale-correct replacement built for the Tamiya TRF421X chassis. Produced from nominal 2mm graphite, the split plate mounts at the rear section of the upper deck to introduce local stiffness while keeping clearance for drivetrain components and suspension movement.

Fit this insert when you want a controllable change to rear-end rigidity as part of broader tuning. Adding graphite alters chassis flex behavior and therefore steering and traction; integrate these changes with adjustments to shock valving, camber angles, and anti-roll settings for best results.

Fitment is straightforward: remove the original rear upper deck panel, position the split graphite piece, and secure it with the chassis' existing fasteners. Avoid over-tightening hardware to protect the graphite, and confirm clearances before use.