You're running a 225 on a 9" wide rim? Seems like it would be stretched...I run 225's comfortably on a 7.5" rim.

Also, I've only ever seen offsets in integer values, except for custom wheels. Perhaps +38? Are there no markings on the rim anywhere? Almost all rims (real or 'fake') typically have stampings/markings dictating some of the specs. Usually on the barrel and/or on the face that mounts to the hub.