Four-wheel-drive (4WD) pickups and sport utility vehicles (SUVs) add a completely new dimension to the wheel alignment process when they're equipped with wider or larger diameter tires than the original equipment (OE). Modern tires are manufactured in various aspect ratios (the percentage ratio between casing width and sidewall height), rim diameters, casing diameters, tread widths, tread designs, load ratings and maximum speed ratings. Of course, tires are an integral part of modern steering and suspension systems, not to mention they are often an equally integral part of modern safety features like anti-lock braking systems (ABS), electronic stability control (ESC), active braking and lane-change warning systems.
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