<P> In many racing cars, the springs and dampers are relocated inside the bodywork . The suspension uses a bellcrank to transfer the forces at the knuckle end of the suspension to the internal spring and damper . This is then known as a "push rod" if bump travel "pushes" on the rod (and subsequently the rod must be joined to the bottom of the upright and angled upward). As the wheel rises, the push rod compresses the internal spring via a pivot or pivoting system . The opposite arrangement, a "pull rod", will pull on the rod during bump travel, and the rod must be attached to the top of the upright, angled downward . Locating the spring and damper inboard increases the total mass of the suspension, but reduces the unsprung mass, and also allows the designer to make the suspension more aerodynamic . </P> <P> A short long arms suspension (SLA) is also known as an unequal length double wishbone suspension . The upper arm is typically an A-arm, and is shorter than the lower link, which is an A-arm or an L - arm, or sometimes a pair of tension / compression arms . In the latter case the suspension can be called a multi-link, or dual ball joint suspension . </P> <P> The four - bar linkage mechanism formed by the unequal arm lengths causes a change in the camber of the vehicle as it rolls, which helps to keep the contact patch square on the ground, increasing the ultimate cornering capacity of the vehicle . It also reduces the wear of the outer edge of the tire . </P> <P> SLAs can be classified as short spindle, in which the upper ball joint on the spindle is inside the wheel, or long spindle, in which the spindle tucks around the tire and the upper ball joint sits above the tire . </P>

The benefit of using different length control arms in sla systems is what
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