I am picking up 2 of these, and I’m not too sure they will fit. According to people I have talked to they will fit my stock 18 on my cobalt, but I’m not too sure. They are a 235/40/18 with 100% treadlife. So this is kind of a feeler post seeing if anyone would want to pick these up if they don’t fit on my wheel. Oh, I would say $200 for both.
just walk out to your car and see if the ires on it are 235 R18, then you will know
u have 215 so technically they should be a 2353518
I’ve check the overall diameter and it’s within .2 of the stock tire. It’s just the “recommended” rim width is 8.5-9’ where my stock wheel is only 7, but people on the cobalt forum have put this size on their stock wheel, so who knows. I was only posting this up here to see if anyone would want them incase they don’t work for me.
they should fit fine… i’ve had a car with 255’s on 7" wide rims, not really somthing i’d recommend doing tho 
but yea, 235’s is safe
iam just doing the plus size method because the wider u go the sidewall gets bigger
well hopefully I will know by saturday, so until then it’s still a “feeler” to say.