I need to change the wheel radius, the radius seems not directly modified, so the need to remove the wheels, then add the new four wheels. I ask, what the wheels removed.
  Thank you

you can change the wheels radius
eg
yourWheelMesh.scale(newRadius / oldRadius)
yourAWPRaycastVehicle.getWheelInfo(0).wheelsRadius = newRadius;

Just do the same for the other wheels
yourAWPRaycastVehicle.getWheelInfo( 1 )
...

“MyWheelMesh.scale (Num)” has the effect of the naked eye, why should “myAWPRaycastVehicle.getWheelInfo (0). WheelsRadius = newRadius;” this, what benefits, if you do not do any harm?

Thank you