Wheels are usually made from pressed steel or cast aluminum alloy. They should be lightweight, yet strong enough to withstand normal operational forces.
Rim width is the distance across the rim flanges at the bead seat. Its diameter is the distance across the center of the rim from bead seat to bead seat.
Passenger cars normally use rims which are of well based, or drop-center design. The drop-center is used for mounting and demounting the tire onto the rim.
