For sale is a vintage 1992-1997 Shimano 600 Ultegra Rear Derailleur RD-6401 in Tri Color. This rear derailleur is made in Japan and has a short cage length. It is compatible with Shimano 6-9 speed systems and is bolt-on mounting type. The item weighs 225 grams.The rear derailleur is made of aluminum, steel, and aluminum alloy. It is suitable for road bike, time trial/triathlon bike, and racing bikes. The package includes one rear derailleur which is used. This product is a great addition to your bicycle components and parts collection.

Similar in design to the 7-speed 6400 but with slightly different jockey cage.  The formerly aero lower cage now has the normal window. There was also a slight change in the silver paint of the outer plate. This version has more metallic flakes in the paint, making it more "sparkly".  RD-6401 is from the 8-speed group.