Tamiya 19803493 - Blue Knuckle Arm Upgrade for TRF421

Precision steering upgrade for the TRF421 chassis

The Tamiya 9803493 Knuckle Arm Set updates the TRF421 with a bright blue finish and reinforced design. Built for racers who demand crisper steering inputs and improved wear resistance, these knuckles combine reliable geometry with a tidy factory finish. Ideal for trimming lap times without changing your core setup.