So frustrating! About a year ago I took my 2007 BMW 330i touring in for MOT and found that both rear wheels had cracked. Got them both welded and put back on. 6 months later one of them had cracked again, so replaced it with a refurbished, never repaired BMW MV3 alloy. 3 months later, take it in for MOT again today and find that not only has the previously repaired wheel cracked, but the new one has cracked again! Now I'm looking at having to spend £400 each for some new wheels from BMW, or £200 for refurbished ones which might do the same again Not a happy bunny!