Roll Couple Distribution Roll Couple Distribution - is a controlling factor of understeer and oversteer. Increasing roll stiffness at one end of a car will produce a greater tire slip angle of the outside tire. To control a car that is oversteering you would increase the roll stiffness at the front end of the vehicle. Install a stiffer outside front spring or stiffer anti-roll bar. The reverse is also true for an understeering car.
Roll couple is adjusted with spring and anti-roll bar rates.
The stiffer end of a vehicle will lose traction first. So if a car s front suspension is stiffer that the rear, the roll couple distribution will produce understeer because the front end is handling more weight transfer. Center Of Gravity Height - is the geometric center of weight location of the vehicle. The CGH is the point above the ground at which this exists. The lower the CGH, the better the cornering ability of the vehicle.