It has a root bone and child bones for each of the wheels. The wheels rotate correctly and the front wheels steer correctly but the car remains stationary even though the wheels are spinning.
If the start position of the car is in the air the wheels drop slightly when the game is started but not by much and they aren’t wobbling about or rotating randomly as per a previous attempt. The wheels sit correctly if the start position is at floor level.
I’m not sure if you have checked the samples but, try the Sedan.
If you right click (in your content browser) the mesh of the Sedan and - Asset options - Export you can get the fbx file and possibly load into max and compare the basic schematic to ensure it’s nothing mesh wise which is creating the issue ?
Feel free to post some screenshots mate and if I can help I will, still learning myself but vehicles is where I am at myself