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Most 235/45/17 are not meant to be mounted on a 17x7 rim. The 235/45/17 will fit the stock 17 x 7; however, each manufacturer is different. Toyos, Nitto, and Bridgestone will fit. The Nitto specifically was designed to be fitted on 7-8.5" on their website; however, they are not XL rated. You should check with the manufacturer -- the Toyos have thick rim protectors and fit the stock wheels great. You will get minor scratches if you do an aligment with certain brands since the tire and wheel fit so snugly.
A 1/2" is not a big deal and Nitto and a few others mark down 7" as the minimum width for a 235/45-17.
On the other hand, if you aren't sure, call the manufacturer. Some of the dealers out there are NOT TO BRIGHT.
Some of them don't care about your safety, and will put low profile and/or wide tires on the stock rims without concern.
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