Tire will be a 275/35/20
^^^^^That is the tire size I have on the front, in a Dunlop Sport Maxx GT, to match the 325 rears.
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Tire will be a 275/35/20
I was running a 315/35-20 in the rear on widened SVTPP wheels. I've since mounted 325/30-20s, and the 285 are a little taller. I've also since acquired a set of True Forged wheels in 20", so I will mount the 275/35-20 that came mounted on them. It's a closer fit to the new rear rubber in terms of outer diameter. A 285/35-20 specs at a taller diameter, but has the same rev per mile data, so the loaded radius works out to be the same. I'll probably end up there at some point.
But to answer your question, the 285s were great. The taller sidewall made for a comfortable ride and I didn't have any rubbing issues. Anything much shorter would have looked out of place with the 28.8" rear diameter. My front end wasn't lowered much, however. I don't track the car, so they were never pushed to the limits of adhesion.
I run a 10 x 20 with a +48 mm offset with Michelin PSS 285/35/20 tires. My tires are inside of the fender lip with plenty of room to spare. Moving outwards by 10mm shouldn't cause any issues.