It is time to put new tires on my 05 RT. Was wondering what size to go with on the stock 18" wheels? I don't want to go with the stock size(225/60-18). Would like to get wider tires that are about the same dia. so that the speedo is not off (slower or faster). Have been looking at 255/55-18 tires. They are about 10" wide and just a hair taller so speedo woun't be off. Will they fit in the wheel wells without rubbing? If so, how wide can you go before rubbing becomes an issue?