12 inch wide wheels are a wide-truck size — expect a lift, a wide tire and careful offset planning. This width appears most often on 22 inch, 20 inch, 24 inch wheels, and it is sized for 295 to 335 mm tires.
We list 4,397 wheels at this width. Width is what limits your tire choice: mount a tire that is too wide and the sidewall bulges, too narrow and the rim edge takes the hits. If you are between two widths, go with the one inside the tire manufacturer's recommended rim range.