Be mindful of what class that your wider wheel size will bump you into. If you want to be most competitive, you should stick with an 18x7. Not many choices in that size though. I would recommend going with a 17" wheel if you aren't sticking with the stock size. They are usually lighter than 18's and cost less money. The tires for a 17 are less expensive as well. I think a lightweight 17x8 with some 245 width tires would be awesome on our cars. Just try to get some tires that are about the same diameter as stock.
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