In motion going over a railroad track on mcmillan ave (city street) in north charleston, sc. there was a pot hole at the railroad track. while going over track/pot hole, heard a loud thud. tire pressure sensor came on almost immediately. took tire off and put on my spare. took my tire and rim to tire shop to purchase new tire, it was then that i found out my rim had cracked, and that i would in fact need a new tire and rim.