I was looking at a pair of 17" rims but the markings on the tire state 215/45R18. This threw me off because I thought the last number (18) represents how big of a rim the tires can fit on.
Is there something I'm missing in regards to tire and rim size?
I've heard of people "stretching" their tires before but I don't know much about it. Also, these are rims on a new car at the dealership (2018 Subaru BRZ tS). I was under the impression that the STI rims that come with this car were 18's, but now everywhere I look online they seem to be 17's.