Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount/Hanger Mount for Mountain BikeRear Derailleur RD-TZ31-A 67 Speed Direct MountHanger Mount for Mountain BikeFeatures of Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike MODEL:RD-TZ31-A bike rear derailleurThis is a mountain bike derailleur, which is basically suitable fo..