Features: 1.3 Gear Speed Transmission: This rear derailleur could achieve 6 7 8 speed transmission 2.Better Control: This rear derailleur, with its unique design, combines specially positioned tooth profile and shift ramp to improve chain control during shifting. 3.Precise Changing: The guide pulley controls the trajectory of the teeth from front to back to optimize each change, this perfect monitoring helps to achieve the most accurate changes. 4.Aluminum Material: Made of excellent aluminum material, this rear derailleur is highly sturdy and stable, not easy to damage. 5.Easy Installation: This is a perfect substitute for your old worn or damaged rear derailleur, which is precisely made, accurate in size, easy to install. Specification: Item Type: Rear Derailleur Material: Aluminum Size: Approx. 16x10x6cm/6.3x3.9x2.4in Application: TY300 rear derailleur 6 7 8 speed transmission PackageList: 1 x Rear Derailleur