ok so I have 06 chevy cobalt SS/SC with stock rims. When I purchased my car used it had 225/40ZR/18 90W sunfull tires one directional tread. I recently busted my rim and tire on a mango sized rock on the free way. Well I found a used rim for 220 bucks, but I can't find a used tire with these specs in my area. I only need the tire for a few more months before I go to korea. I noticed that that for my rims the tires that are supposed to be on are 215/35ZR/18 Is this bad to have the other tires on the rims. What is the pros and cons to having a different size tire then manufacture requested tires. Should I still try to find a tire size of what is on my car currently. Right now I am running on a donut which can do some damage if I don't fix it soon. Please help thanks.