OK, I know to use the search button, no luck. I have a 1978 Columbia Imperial, the back tire is now flat. I have the manual and the part # it calls for. Here is the description: 734-0774 Tire Only 21 x 2.25. NOW, the tire that is on there is a 17 x 2.25, I really am just not sure what to get as far as size and a good tire. If I could get out of Paying $30 for a tire that would be great. Thanks for the help.