MR-03 Narrow Front Upper Arm MR3-19/BU - Precision Tune by 3Racing  [MR3-19/BU]

Kyosho MR-03 Narrow Front Upper Suspension - 3RACING MR3-19/BU
Price:
USD$5.90
Brand:
3Racing
Model:
MR3-19/BU
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High precision narrow front upgrade for Mini-Z MR-03

The MR3-19/BU narrow upper suspension arm is an aftermarket Mini-Z component intended for MR-03 chassis that accept a reduced front track geometry. It provides a controlled change to the front linkage layout to influence steering response and handling balance.

Compatibility is specific to MR-03 variants with the narrow upper arm mounting pattern; when mount points and ball stud spacing match, the part installs as a direct replacement or as a tuned option to modify front-end behaviour.

Installation follows standard Mini-Z procedures: remove the factory upper arm, inspect ball studs and bearing seats for wear, install the MR3-19/BU in the correct orientation, and confirm steering travel and toe settings. Post-fit checks should include servo endpoint calibration and inspection for any steering bind through the range of motion.

Tuning considerations: narrowing the front linkage affects track width and ackermann influence, which alters turn-in aggressiveness and steering centring. Use the MR3-19/BU when seeking reproducible changes to front-end balance as part of a broader setup strategy.

What technical checks ensure correct fitment?

Verify upper arm mount spacing and ball stud thread engagement against the MR-03 narrow pattern. Confirm bearing seats are undamaged and that the arm clears steering links through full travel.

Which setup changes are recommended after fitting?

Reassess toe and servo endpoints, then evaluate steering trim. If front-end behaviour is too reactive, adjust anti-roll and shock tune to rebalance grip and transient response.

How does this arm interact with other tuning parts?

This arm changes front geometry and should be considered alongside track width, roll stiffness and steering ratio. Use measured test laps to determine complementary adjustments to shocks and toe settings.