How thick is a car wheel?

It depends on the material it is made of and how it is made( stamped steel, cast or forged aluminum). Stamped steels are the thinnest 1/8 thick at the lip/bead, up to 3/16 thick at the lugs/hub. Cast aluminum are the thickest at 3/8 thick at the lip up to 1 inch thick at the lugs/hub.