Because Michelins run wide. Because that's not BMW spec. BMW only speccd 245 on a 8.5" for e9x and they still kept 265 for the 9.5" (on e9x). They actually specc'd 255 for the 9.5" for u.s. E46 with 19". Because albeit small, 245/275 is heavier and slower. Perhaps turn in feel isn't as crisp either.
Wider tires don't give a wider footprint. You'd need wider wheels.
Wider tires don't give a wider footprint. You'd need wider wheels.
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