Shimano Tourney RD-A070 Rear Derailleurs FEATURES: Smartcage design with 11/13t pulleys allows for short cage and a 28t max low cog SPECS: Color: Black Largest Cog: 28 Rear Derailleur Mount Type: 10x1 Standard Chain Wrap Capacity (teeth): 37 Cage Length: Short Rear Der/Shifter Compatibility: Shimano Mountain Drivetrain Speeds: 7