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I had the 19" MV3 alloys after buying replacement 2nd hand ones twice and welding them 4 times (always the rear) i ended up buying aftermarket ones, i was told by this guys that owned a tire shop near me for 30 years that BMW outsourced these to India, apparently as Magnesium is expensive the Indian company put in less magnesium than the German spec and hence the issues. dont know how true this is,.
the run flats defiantly affect it i have removed my run flats now and have a space saver spare in the boot
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