I sanded the rims and sprayed them silver with a very light metal flake. The dark areas were painted a satin dark grey (almost black). To mask off the rims, I masked it up and trimed along the wheel lines with an Xacto knife. That ensured the lines were clean. The shiny part are chrome beauty rims from a 1985 Ford Escort. The originals were beat to heck and needed to be replaced.
This photo isn't a close up, but you can see the colors more accurately:
