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I have had bumps on the tread portion and sidewall of tires before and it is basically some sort of internal structural failure of the tire.
Get rid of those tires ASAP they have failed and could be dangerous to drive on.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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