The Tamiya 9803475 Upper Deck B is made for the TRF421 chassis and boosts structural stiffness to help keep the car planted. Hobbyists aiming for steadier cornering and predictable setup behaviour will value this precisely manufactured spare part.
Installing the Upper Deck B reduces flex under load, producing sharper steering inputs and more consistent responses at speed. This is useful in tight sequences and when pushing for faster lap times.
Engineered to match the TRF421 geometry, this upper deck fits without extra modification and strengthens the overall chassis assembly for long term durability.
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