I bought my BMW E93 330d MSport cabrio new on 25/06/2007 from Almondbury BMW Huddersfield With 19” wheels. After 5,000 miles the rear tyres badly scrubbed on their inside edges. BMW replaced the tyres under warranty and re-set the alignment. At 11,500 miles thought I had a puncture in the nearside rear. On inspection I found that the wheel had seven cracks in the alloy rim and the offside rear wheel had 2 cracks that had caused the deflation. All 4 tyres were also badly scrubbed. BMW agreed to replace the wheels and set tracking and half towards tyre cost. At the car’s 15,500 mile service was I was told tyres ok but tracking out, tracking re-set as good will. At 20,300 miles I thought I had a puncture again. I found the rear tyre badly scrubbed on its inside edge, tracking obviously out again. The car is at Almondbury BMW at present so don't know if wheels are damaged. Could I ask, have you experienced these problems before? What do you feel BMW should do under warranty and have you any suggestions of a cure?