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I also have an 06 330xi my 2 front tires were replaced after just over 9k because they were creating such noise.  Luckily my dealear told me they considered the tires defective and replaced them for me free of charge.  I have now put 10k on the new tires and already have a bubble in one of them.  When I took it in the told me it was considered a road hazzard and not covered, oh and by the way my two rear tires which only have 20k on them have no tread and also need to be replaced to the tune of over $1k.  Amazing since my last car had low profile tire and I never once had a bubble and went through maybe two sets of tires in 85k miles.

Does anyone know it if is a problem to change to normal tires from the run flats, and does it effect your warranty at all if you go outside of BMW to get them?  

I have a 2007 BMW 328xi and I have had consistent problems with the run flat tires on my car.  I have just over 26K miles on it and I've ben through 6 tires and I'm on my to number 7.  I just noticed today a large knot or bulge on on the side of the front right tire.  These tires have been an absolute nightmare!  I find the loud, rough and obviously have wear and tear issues.  I find this unacceptable from a BMW.  

I have a 2006 BMW with 26000 miles on Bridgestone run flat tires.  Tires have been rotated twice, constantly monitor air and complained numerous time about the wear and loud tire hum.  I am disgusted that BMW would allow such tires on the ultimate driving machines.  Class action, I would be in for it all the way.  

We have a 2004 Z4 with run flats.  Never did like the ride or road noise. Needed new tires at 28,000 miles so I replaced them with regular Hancook tires and a can of Fix A Flat.  Best move ever.  MUCH better ride and much less road noise.  Better handling tire too. Price was over half less and I can have the tire fixed and on my way if I do have a flat, unlike the run flats which have to be ordered as you can not fix them and nobody stocks them.  

You may try looking at this website.  They have a great selection of tires and they also do car repair.  http://www.ntb.com.  

Attention BWM & run flat tires owners: BMW Bulletin #360606 is a secret BMW memo to dealers, instructing them about the road noise. BWM will pay for new tires if you have less than 10,000 miles on them; they will pay 50% of the cost for less than 20,000 miles. They won't tell you about this - you have to ask.
Warning to BMW owners - pay attention to your tires!  

I think, I have seen hundreds of complains like this in many forums.  
BMW E46 2008 BMW Bulbs