Used Shimano 600 6400 series crank, bb, rear derailleur and brakes. Crank is 172.5 arm length, 52/39 chainrings. Bottom bracket is 68 x 113. Derailleur is short cage, brakes have 50, 52 mm reach. Chainrings show corrosion and wear. A few scratches and dings. Derailleur, bb and brakes have small scratches and dings, little dirt. BB shows tool wear, some dirt. Brake pads are cracked, but I think are original. Sold as is, US shipping only.