i have an e90lci xi and was thinking of going square setup... is that the standard tire size for 8.5 square?
i see many staggered setups do 35 in front and 33 in back. 25 might be too much like stated above... and id think 40 wouldn't be enough and I feel i would just end up getting spacers. But I don't know if getting 8.5 all around means you would need a different offset for the rears? (vs the 8.5x9.5(or 10") staggered setup)