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Wheels are a very individual choice. For me.....I know how many times I "find" a pothole and say out loud "boy....I'm glad I've stuck with 17's" because any 18 would be bent. I'm sticking with 17's on my LGT in a 7" width with a bit of offset go get them more outside the car.
This also works well for track. To stay in class, I gotta stick with 17x7 and the offset can't be more than 5mm from stock.
There ya go.