Kyosho MR-03 Narrow Front Upper Arm - Tuning Part MR3-19/BU by 3Racing  [MR3-19/BU]

Mini-Z MR-03 narrow front tuning arm

The MR3-19/BU narrow front upper arm is an aftermarket suspension link for Kyosho MR-03 Mini-Z cars. It reduces front track width to influence steering response and front-end balance, and it is intended solely as an RC tuning component.

Compatibility is limited to MR-03 variants with the narrow upper arm mounting pattern; where the chassis supports the form factor the arm can be fitted as a direct replacement or as an upgrade to alter handling characteristics.

Fitting requires standard Mini-Z service steps: remove the original upper link, inspect ball studs and bearings, fit the MR3-19/BU with identical orientation, then confirm steering travel and toe. Small adjustments to the servo endpoints or sway links may be necessary to achieve the desired geometry.

Tuning notes: this narrow arm affects steering responsiveness and turn-in behaviour, making it useful for trimming front grip and steering feel when preparing the car for a particular surface or circuit layout.