I discovered this by accident the other day and wanted to share!
Start by equiping Rotiform NUE wheels. Next, go to the paint booth and paint the wheels. Use metal flake paint, option 3. Press X to select the base color.
(I forgot which order I did these in, so if you try this today and don’t get the effect shown, reverse the settings for base and flake color. I’ll double check and edit this later)
I set the base color to the following settings: Hue 0.00, Saturation 0.00, Brightness 0.00. This makes the center black.
Accept, then press Y to set flake color. For the red shown, I used the following settings: Hue 0.00, Saturation 1.00, Brightness 0.00. This makes the lip red.
To change the lip color, move the Hue slider to the desired color.
Other interesting combinations can be made, so have fun and good luck!