Using performance tires with soft OEM Rubber Strut Rod Bushings causes the steering axis slant (caster) to change, which causes premature failure of the lower control arm bushings. Energy’s Polyurethane bushings help reduce common wheel "roll under" while braking and loss of steering control. While braking, they keep the front wheels and lower control arm assembly from literally rolling under the car! A must to use with larger or performance tires. In addition, these bushings diminish wheel hop on FWD vehicles. With the increased use of higher traction and performance tires on today's vehicles, soft original factory rubber bushings can very often cause the steering axis slant (caster alignment) to excessively and adversely change. This unwanted alignment movement also leads to premature failure of the lower control arm Bushings and even excessive tire wear. During hard "standing start" accelerations, Energy's Strut Rod Bushings help control unwanted steering axis changes, diminishing wheel hop and reducing traction loss. While accomplishing all of this they still allow the suspension to smoothly travel throughout its full operating range, without binding. This is true for either front and rear wheel drive vehicles. When braking hard, Energy's HYPER-FLEX™ performance Polyurethane Strut Rod Bushings help keep the front wheels and lower control arm assembly from literally rolling under the vehicle! Additionally, the exclusive formula HYPER-FLEX™ Polyurethane material assures long lasting performance, unlike many OEM Rubber Bushings.