The Shimano 600 Tri Color rear derailleur is the standard for inexpensive, high performance rear derailleurs. There are a lot of parts available for them, and cheap! It's also easy to match an entire group to this derailleur, as there's plenty of 6400 series parts around (save working STI shifters! Those are rare).
Condition: This one looks like a take-off from a new bike. It still has the plastic protective film on the faceplate, and is pretty close to perfect. There is a slight amount of dirt in the nooks and crannies, which is probably from storage.
- Compatible with 6, 7, 8, and 9 speed drivetrains
- short cage