Snafu said:They won't change the computer for such a minor difference. You would only see a fraction of a mph difference at well over 100mph. ABS will remain unaffected as well.
You can switch between wheel sizes however you like as long as you adjust the tire size to compensate for the change. It is the "Rolling Diameter" that you want to remain consistent...this is wheel plus tire sidewall (which I think you know).
For example, we sell 18" and 19" wheel/tire combo's all the time with 245/40/18, 275/35/18, 245/35/19, and 275/30/19 tires and there is no need to adjust the computer.
Hope that helps. :thumbs: