[fafner1]

Three wheeling results when the roll stiffness is concentrated at one end. It is standard practice to try to concentrate the weight over the drive wheels (front or back) and then balance the car by cranking up the roll stiffness at the other end. The resulting cross loading also increases the traction the inside drive wheel can provide while accelerating. Increasing the roll stiffness at the non-driven end is usually done by putting on a stiffer sway bar, which counteracts roll by trying to pick up the inside wheel. At some point a stiff bar will exert enough force to actually lift the inside wheel. Once the inside wheel is in the air the sway bar is in effect maxed out, it can no longer contribute any additional roll stiffness. It looks a little strange, but my VW GTI feels completely normal cornering while carrying the back inside wheel several inches of the pavement.

Sir John Whitmore used to be able to lift the front wheel on his Lotus Cortina high enough to clear the rumble strips on the inside of the track. This gave him an advantage by allowing him use a tighter line through the corners.