The Tamiya 9803475 Upper Deck B is intended to reduce chassis flex on the TRF421 platform, helping the car hold its tune through demanding runs. Its precise manufacture supports consistent handling and repeatable setup changes.
Reducing deflection across the chassis improves tyre load distribution and steering precision during hard cornering, giving drivers clearer feedback at speed.
This upper deck aligns with TRF421 mounting points to reinforce stressed areas and improve the overall robustness of the chassis assembly for regular competitive use.
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