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Well, according to wheel offset calculator under the wheels and tires section of E90postDOTcom forum, the next 19" size up that would have the proper circumference is 315/35/19 - and tirerack lists exactly one option for that size (a Hoosier R7). If the wheel changes to 20" there can be other options for tires, meaning that you then have to figure out correct offsets and proper widths that might work... and may need to go to 20" on the front - at which point you may be looking at X5 / X6 sizes.
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