Yeah, driving to my in-laws on I78 going west the RR tire suddenly just went flat. I was in the left lane doing about 60 when this happend.

I took off the tire and on the inside tire wall its shreddedl. Like someone took a knife and just in a semi-circle. Ill take pic's in the morning but, im pissed casue I have a donut on and have to drive like 60 miles back home on monday.
Tires are Sumitomo HTR 225-40-18
Lets see if pep boyz, sears or whatever else is out here may have a tire like that.

Does Pep boyz sell a generic rim for my car and I can just purchase a basic tire for it?