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Today, I tried my factory V6 spare tire to see if it fits over the GT brakes upgrade and it does. I tried it on the front and rear and it clears both brakes just fine. The spare tire size is T155/80 17. I had seen some varying information on this when I searched and thought I'd pass along my results.
 

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Thank god. I have heard that the GTO spare fits. I would never ever use that stupid thing that GM gave us incase we get a flat again. I used it once and not only did it ruin a perfectly good Dunlop from being patched, It ruined a TPS.
 
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