Tamiya 19803493 - Blue Knuckle Arm Upgrade for TRF421 wheel Both front and rear springs

Both front and rear springs are shortened from the previous kit (front spring from 70mm to 68mm

as the Fan Holder itself secures the Battery

no-fume/no-odor cleaning solution is skin-safe

What’s in the Box

These springs can be used on both the front and rear

Tamiya 19803493 - Blue Knuckle Arm Upgrade for TRF421 wheel Both front and rear springsPrecision 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.