Tamiya TRF421X Split Upper Deck 1.6mm Graphite - Compatible with TRF421X O-TCP012S by Factory Pro  [FP-O-TCP012S]

Rear Split Upper Deck for TRF421X Chassis

This is an aftermarket rear split upper deck produced for the Tamiya TRF421X touring car platform, supplied as a lightweight graphite plate with a nominal 1.6mm thickness. As an RC hop-up it alters how the rear area of the upper deck couples with the chassis, enabling measured adjustments to local flex and overall balance while retaining the stock mounting geometry.

Installation follows the chassis' original mounting points and uses existing fasteners; confirm mating surface clearance and alignment before final tightening. The split line affects load transfer through the rear assembly, so minor fit differences or shimming will create noticeable changes in handling characteristics.

Use it as a chassis-setup tool: swap with the original deck to identify handling changes, or combine it with other deck thicknesses and rear-end components to refine rear grip, rotation, and transient response. This product is intended for use in TRF421X RC kits and is a chassis component rather than a universal structural replacement.