Oh, that's a good question. Do you have a skinny 5" wheel? If so a 165/80R14 (about 6.50" wide), or 560-14 (about 5.9" wide) are your best choices. Not sure how much room you have but one of these will probably work and they're right around 25" dia. Note that these sizes will not be available at most normal tire stores. I know Coker has the old sizes though.
