Trek 520 Disc Frame Set520 is a steel touring bike made for the open road. It's the longest running model in our line up, and it's built to carry you and your gear on your longest journeys. Extra mounts, an aluminium touring fork and included headset, headset spacers, cable guides, front quick release skewer and seat post collar, make this frameset the perfect platform for your custom adventure companion. *Please note spec applies to all sizes unless listed separately