E55 rim size?
what is the maximum wheel size you could fit? w/o rubbing or having to shave anything down
what is the maximum wheel width you could fit on front? on rear?
and while we are at it, give the tire sizes for each...

20x9 front 245/35/20
20x10 rear 285/30/20
They have only been on for a few weeks and they don't noticeably rub but I am getting that rear end wiggle under hard acceleration others have talked about, and the ride sucks compared to the 18's. I may or may not keep them on there.
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My old set up works for sure.
20x9R 20x10R
245/35/20F and 275/30/20R
I'm am beginning to find out that 285/30/20 will work but will rub under "hard acceleration"

If fender gap is what you are trying to avoid then lowering is actually a much less expensive resolution (especially when you consider the STAR diag lowering for the w211 55). If you get a larger wheel/tire it will not help with the fender gap, which will actually get larger.
To put it in perspective, a lowered e55 with 18's will have less gap than a non lowered e55 with 20". The best combination of course would be 19s or 20s AND lowering!!
Something like this:
20x10.5 Rear 285/25/20
Ideal setup, no rubbing with the correct wheels on the E55.
narrower than the outer rim, which will prevent rubbing against the fenders as
the suspension compresses. To get a more "square" looking tire, put the same size tires on 8.5 and 10" rims.
Your tire height is perfect and close to stock, 25.8" F and 25.6" R.




