Since you will not be able to rotate your wheels front and back, can you explain why you would not go with the wider rear wheels and tires? Cost is the same, and they will look significantly better staggered. Is there an advantage that I don't know?
I can't rotate the wheels front and back, but I can rotate the tires. America's Tire will dismount and remount my tires to swap them front to back on the wheels as needed for the lifetime of the tires for free. If I went with different width wheels, then I'd have two sizes of tires and could no longer rotate.
That, and I figured I might get slightly better range with 245's than 275's. Not sure if it will really be a measurable difference, but it couldn't hurt. I also heard that the 85D has almost NO tendency to rotate as it is, and figured adding 275's in the rear would only make it more prone to understeer.
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I went with TSW Nurburgrings in 20x9 ET35 with 255/40-20 Conti's all around.
No issues with traction mashing the pedal to the floor on dry/clean pavement. Every first time passenger wants to experience max acceleration, and the only issue thus far was dirt/sand on the left side wheels. TC kicked in, so that passenger got a do-over.
I didn't go square so much for rotating purposes, but mainly to get extra rubber on the front drive wheels, which are doing triple duty (drive, steer, brake).
For a time I was worried that not going with 265's or 275's in the rear was a mistake. Turns out my fears were unfounded.
255's are lighter, cheaper, and have less rolling resistance. The one possible negative could be a bit of added oversteer, which I won't mind one bit.
Can you post a pic of how your rear's look in 20x9 +35? Just curious if I'm being stupid trying to get these +20's for the rear. They're special order and backordered for who knows how long, so I may just go +35's all around like you did.