A lot of people have been running 325/25r21 which still has a slightly taller sidewall than your current 305. I doubt a 30 will work at all unless you cut down to 285/30r21 or maybe 295/30r21 but your front will need to be a 265/35r21 with those options.
How wide are your wheels and what offset? Based on that pic they look like 11" or 11.5" and around 20mm I think?
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SCOTT26 "So as an admirer of the M5 and a potential customer of an M5 Touring. I would run naked around the streets of Garching if they were to offer one."
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