Tamiya 19803493 - Blue Knuckle Arm Upgrade for TRF421 wheel they also look cool and

they also look cool and help to balance the overall downforce by offering a slight upwards sweep

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

These springs can be used on both the front and rear

over 65% weight loss compared to stock screws

What’s in the Box

Tamiya 19803493 - Blue Knuckle Arm Upgrade for TRF421 wheel they also look cool andPrecision 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.