use a moving wall
boundary conditions > wall
rotating region is best for something like a pump/impeller
Can you tell me what the difference is in using a rotating region or a moving wall?
A tyre and a wheel look similar to an impeller so why use a wall
check the solidworks kb, this is purely a best practice recommended by the developers based on the flow that is generated by something that is rotating
also since you aren't designing the tire's shape, there is no point in adding the complexity of a rotating region