For Sale: Trek 520 Touring steel bicycle frame fork OX tubing Shimano Small / Med Measurements: please note, this is compact frame with a sloping top tube, easy to mount. Seat tube, center to center: 15.5 inches; seat tube, center to top: 17.25 inches; top tube, center to center: 20.5 inches. I typically ride a 53/54 cm frame and I rode this just fine. Legendary Trek 520 touring frame and fork here - lots of braze ons for cages, racks, you name it. Very stable platform to build on. Includes Shimano XT V-brakes for a little more stopping power over the stock cantilever brakes. Some scuffs and scrapes from use but no dents or dings that I could find. Frame will be expertly packed and will ship FedEx Ground.