Hey @xtraserwonx
Your UV islands are overlapping each other, if you go to the UV Editing workspace and in the 3d view with Hub and Tyre in edit mode, press A to select everything.
In the UV Editor you will see your UV layout, notice the UV islands are overlapping.
You will need to move and scale them to fit in the UV space with a few pixels gap between each.
While you still have everything selected, in the 3d view press U and select unwrap.
Blender will give you a fairly decent unwrap, from here you can adjust the scale of each island depending on the required pixel density of each.
