Any time you change tire size it's gonna affect the speedometer (and, by extension, the odometer).
But, it's really no big deal. Just get an AEV Procal ($150) and you're good to go. It'll also allow you to adjust your TPMS sensitivity (or turn the warnings off altogether, if that's what you want), set daytime running lights, etc.
Handy little gizmo.
ProCal Module - Electronics - Shop By Category