It's a very common problem. Most likely a stuck pebble. Mine happened right after I drove through a short gravel driveway (never again). I took the noisy wheel off and that fixed it. Others have had the noise go away on its own.
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2011 1M | Valencia Orange | #655 of 740
BMW Performance CF Spoiler | BMW Performance Shadowline Grills | Gloss black iND side markers
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