You don't need a tire size calculator, you need to know if someone has done it before. I don't know the maximum size, but I know that 265/70 fits. This link is the only example I know of, done for similar reasons by a long-time member.
Xoutpost.com - View Single Post - Wanna fill up your wheel-wells with snow tires?
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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