Unfortunately it's not possible to change the wheel colour yet!!
- Extract the 'Ken Block RS RX 2017 1.0' rar file
- Go to: Project CARS 2 - Vehicles - Textures - CustomLiveries
- Replace the 'ford_focus_rx_livery' DDS file
Ken Block - Ford Focus RS RX - Rallycross 2017 1.0
KEN BLOCK - Ford Focus RS RX 2017- Custom Livery - Rallycross