What makes a tire bulge?

tyre - Tyre of a car
@joseph_v (212)
India
December 29, 2006 8:10am CST
the tire is only a month old. I had a blow out a month ago, so I replaced the tire. I asked the service place to check the rim and they said it was fine. I do not recall hitting a pothole or a curb with the new tire, however, I took it to pep boys and they said the rim was cracked.
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