Standard equipment wheels are drop center (depending on year/type), steel wheels with safety rims. Optional wheels include styled steel and cast aluminum. The steel wheels are the two-piece type that consist of a rim and center section. The two sections are welded together to form a seamless, airtight unit.
A wheel safety rim has a ridge (raised edge) located inboard of each rim flange and at the top of the rim well. Initial inflation of the tire forces the tire bead over the ridge sections. In case of tire failure the raised sections help hold the tire in position on the wheel until the vehicle can be brought to a safe stop.
The wheels should be inspected on a frequent basis. Replace any wheel that is either cracked, bent, severely dented, has excessive runout or has broken welds. The tire inflation valve should also be inspected frequently for wear, leakage, cuts and looseness. The valve should be replaced if defective or its condition is doubtful.