Front or rear coil springs developed by Moog are suspension components that are tough and long-lasting. Worn or sagging coil springs can cause premature tire wear because of vehicle misalignment. For chassis parts replacement, Moog is the first choice of a professional technician. To upgrade the vehicle to carry heavier loads, Moog variable rate coil springs are the best choice that can be used as an original replacement. The resistance changes as the spring compresses, becoming gradually firmer as the weight on the spring is increased. The springs contain a "comfort range" with closely spaced coils to give a smooth ride. It is also available in the "load range," which has widely spaced coils to reduce deflection and preserve chassis height when the vehicle has more loads.