i ran 255/35/18 on my 18X8.5 wheels before .........
i even did 255/35/18 on a set of 18X8 before
i had 225 int he front and 255 in the rear and the staggered setup look nice ........
i have since then upgraded to 19"
i fit 265 on a 19x8.5 before, but it's not recommended, the tires will bubble outward make it wider than it is.
just run the recommended tires man, 19x8.5 = 235/35-19
reason why rennsport recommends dunlop is because of the round sidewall, for 19x10, we can't run anything wider than 265/30-19, due to the round sidewall, it will cause less problem compared to pirelli (straight sidewall)
but to answer your question... 255 will work just fine
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