I have a 13 inch galvanized trailer rim with an unused trailer tire mounted on it. I would like to trade it for a 14inch galvanized trailer rim. I say unused tire because I have no idea how old the tire is. It was the new spare on a friends trailer, he sold the boat and forgot about the spare in his garage and he gave it to me. After resent trip to the keys, I understand the need for TWO spares!