for info I got 285 30 18 and 255 35 18 ad08r on my car
The 255 runs wide but the 285 runs narrow
if you put both side by side the 285 looks more a 265 compared to the 255
but the 295 30 19 ad08r runs wide more like 305
the same tire profile can run wide or narrow depending on the size.
this is confirmed by tire-rack table where all width in inch are marked
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