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      07-21-2008, 09:24 AM   #4
Gary@TireRack
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Drives: Formerly 1995 M3
Join Date: Oct 2006
Location: South Bend, IN, Tire Rack HQ

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Most bubbles are caused from impact damage that causes a tear in the inner liner of the tire. The air then migrates into the sidewall plies. This bubble will grow as more air tries to escape. It will eventually fail and should be replaced.
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