Just to answer my own questions:
1) my race shop guru confirmed that width isn't so important as the diameter - width will affect traction, of course, and over/understeer tendency.
2) dealer installed my 265/35 R20 Sottozeros on the car, and they fit just fine (there was some thought that the shock tower in front may be the reason BMW put 245's up there)
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John
2010 Dark Graphite 750Lxi
2010 Escalade ESV Platinum Edition
2007 Porsche Cayman S Turbo
2006 Land Cruiser
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