A roll center variator is described, generally including a first transverse locating device, a second transverse locating device, an adjustable spacing mechanism, and first and second simple links attached to the spacing mechanism and a vehicle axle. Each of the transverse locating devices has two ends attached to opposing sides of a vehicle frame. The spacing mechanism is attached at a first point to the first locating device and at a second point to the second locating device. The first and second locating devices are comprised of a Watt's linkage, Panhard rod, or other transverse locating device. The variator includes a screw-threaded rod engaged with the spacing mechanism, wherein rotation of the rod in one direction increases a distance between a first point and a second point of the spacing mechanism and rotation in the opposite direction decreases the distance between the same two points.