I just bought a 2011 xD and ordered the 18" 5 spoke wheels (18" x 7.5" ). The dealership has recommended the 225/40 R18 Brigestones, but I'm interested in wheter I can go with anything wider. Please advise - order is being placed tomorrow (9/12/11) and I'd like change tires if I can get something wider on there.

 

225/40/18 is going to be close to your OEM (195/60/16) size so your speedometer and odometer which is why the dealer wants to go with that size. That being said I have seen members go with 245's and have zero rub issues.