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

Narrow front conversion for Mini-Z MR-03

This MR3-19/BU upper suspension arm is an aftermarket narrow-profile link for Kyosho MR-03 Mini-Z chassis maintenance and tuning. It reduces front track width to change steering feel and front-end balance while remaining a scale RC component.

Fitment covers MR-03 variants that use the narrow upper arm mounting pattern; when the chassis accepts the form factor the part can serve as a direct replacement or a tuned alternative to the standard upper link.

Installation is straightforward for hobbyists with Mini-Z experience: remove the original upper arm, inspect ball studs and bearing mounts, fit the MR3-19/BU arm in the same orientation, and then check steering travel and toe before test runs. Minor adjustments at the servo horn or sway link may be needed to restore intended geometry.

Tuning effect: narrowing the front linkage changes track width and steering responsiveness, which helps when dialing front grip, steering centring, or turn-in characteristics for a particular track or driving style.