Larger tyres also improve your off-road ability with a larger rolling diameter for getting over obstacles and a greater footprint when deflated for improved traction. Coil springs are helical-shaped and made from spring steel. They are designed to compress and expand depending on how force is applied. While coil springs may not have a load capacity as high as leaf springs, coil springs make up for it with their focus on ride quality, as they offer a comfortable ride and smooth handling.