Do you have the physical measurements of the tire mounted on the wheel, or are you basing the differences on the difference in the wheels? A55 series tire is shorter that a 60 series tire, the difference between the two may be less then an inch.
That said, the extra inch and the additional 1/4" away from the mounting surface will probably be more of an issue on the front and rear of the fender clearance when turning, then it will be inside the wheel wheel, unless you are close to something with the current wheels & tires. Gene