This is a Kotter racing bike, handbuilt using Columbus tubing, in Germany in the 80's. It has Campagnolo Nuovo Record headset, front and rear derailleurs and shift levers, Campy Gran Sport hubs, Gali brakes, Sugino Super Mighty cranks, TTT bars, stem & post and Mavic and Wolber rims. This is an amazing bike to ride! All bearings have been rebuilt and the bike has been tuned, cleaned and adjusted so its ready to ride. The seat tube and top tube are both 51cm.