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I tried 10.5 with 295/30 and at ET25 it fit great. A bit tight on the inside.
So then I used willtheyfit.com to start with the outside edge of the commonly known good 10” ET 10-12 front setup (117mm poke), and made the poke/outside edge of a 10.5 to be the same 117mm. That required a 10.5” ET of 16.
So I used spacers to get ET 16 with the 10.5” test wheel and everything fits even better. There’s now another cm room inside.
In my case I wasn't too concerned about pushing the max. Well, that, and not having a shop that was willing to try this, try that. I read here that +15 mm front & +12mm rear on stock sizes would fit so I went with that.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
