Yup, I had a 245/45/18 on my old G6.225/50/18 is actually the size that came stock, which is the same width. I figured I could go a little bit wider on the stock rims without mods as I have done on many vehicles in the past.
I should 235/45R18 should work well for you. They are a bit wider than your stock 225/50R18's. We do Ship to APO's but it is through USPS and there is a charge. Please call us when you can at 1.888.459.4080 anyone here would be happy to help you.I need to get new tires ASAP. I would like to go with a little wider tire. How wide can I go on my stock rims for my '08 LTZ? I would like a Z rated all weather. I will need them shipped to an APO address in Germany. Any help?