WHATS THE BIGGEST SIZE RIMS I COULD PUT ON MY G6?

I would say 18" If you go bigger your tire may rub when turning. If you havent allready lowerd your car and if you are thinin of doing so, I would do that before adding the rims. That way you can see how much lower you want to go after the rims are on. I hope that helped.

I was told the biggest you could put on the G6 was 20".... I just bought the G6 GT and I am working on getting 20s