Why or why not? I know 225 width tires fit rims up to 8.5 inches according to tirerack.com and the R/T rims are 7.5 inches. I have read other threads on here that say 245/45/18 tires are the best but will a 225 tire work? I've been told by a Dodge dealership in Arizona that 245 tires are not recommended. I'm assuming it's a safety issue.