for balanced wheels just make a invisibe circle with the hinge in the middle, the make all the decoration on it and make the desity of the details 0.0010 or 0.010 i cant rememberand to lazy to check
the air friction of the deteils should be 0 to
I think JaX got it partly right, dont use others stuff if they tell you NOT to in their scene description and if u do use stuff the give the credit with thier whole name (not jack it should be JAC(SIRMUSTANG))