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Hey mate, are they stock 18 or 19" rims? I think KU31's are a mid tier tyre, but looking at their specs, they don't seem to make the correct sizes for OEM rear rims.
So you might be running a thinner or narrower tyre which might explain your wear troubles. The M3 also requires high load-rated tyres which narrows the choice of available tyres significantly. Perhaps you're running the wrong size tyres and throw in a couple track sessions and they're feathered and smashed?
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