1.   Locked-up wheels have no traction and slide.

2.   And because each wheel has its own electric motor, the wheels can be driven in opposite directions, allowing the car to turn in place like a tank.

3.   Because a wheel moves faster at its rim than at its center, bigger wheels have higher rim speeds.

4.   A pictogram indicates which wheels have the power, and approximately how much.

5.   Derderian had figured that wheels had to be faster than shoes.

6.   If one wheel turns more than another, it concludes that the faster wheel has a smaller circumference, a sign of less air pressure.

7.   In addition, the wheel has a proprietary design that makes it able to handle stresses more easily, he said.

8.   The optional chromed cast-aluminum wheels have seven spokes.

9.   The wheel itself has four spokes, leather wrapping and an air bag in the hub, the entire surface of which works the horn.