Shimano Tourney Original RD-TY300 6/7Speed Rear Derailleur SIS Direct Mount Mounting Style: Direct Attach SIS indexing for smooth reliable performance Cage Length: Long, Derailleur Action: Top-Normal (Traditional) Suitable for 6 or 7 speed drivetrains, the Shimano Tourney Rear Mech features an oversized jockey wheel for improved service life and noise reduction NOTE: This rear derailleur is Direct Mount, if your bike frame with hook, you can use it, like picture shows