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Once you change the alloys generally its going to read different
Only way i can think of is going to a garage or ideally the place u bought them from see what they say, should jst be a matter of setting it up with the new wheels. Not 100% though
just live with it mate, my car came with 15'' wheels, with 16'' wheels it is over 11mph over at 70! the only time its ever been close to being right was with 17''s