Yeah I know, just thought it was funny...
my point was you CAN increase the overall diameter by about an inch or so and still be legit. Anymore and you will get in trouble.... if you had sad 185/70/14.... then 215/40/17 would still be stock exterior diameter (70-40=30= three inch decrease, 17-14= three inch increase) but you could also have 215/40/18 and not cause problems.
just liked the the thought of 23s on an accord, cause you just know some idiot has tried it