56 cm. This bird was born to ride! Very light ox platinum steel frame with adjustable rear dropouts. Used in the 2011 season as a CX racer. Could be used for daily rider, CX, light touring. Rack mounts. Disc brakes setup. Really light, fast frame, builder recommended no more than 180 lb rider. Check out dornboxbikes.com for more on the builder. $1000 OBO.