The Super Short version of our acclaimed microSHIFT ADVENT derailleur has all the same features as its larger counterpart, but with a small enough cage to fit on a 20" wheeled bike. The ratchet-and-pawl clutch and return spring tension have been finely tuned to offset the smaller cage and lighter chain, allowing the derailleur to deliver fast, accurate shifts with a light feel. The fully metal body resists damage and provides extra rigidity, delivering big performance in a small package. Reliable ratchet-and-pawl clutch is easily adjustable and repairable. Direct path cable routing for smooth and responsive shifting. Compatible with 11-34T through 11-38T 9-speed cassettes. Compatible with ADVENT shifters only. Item Specifications: Cage Length: Short, Chain Wrap Capacity (teeth): 27, Color: Black, Drivetrain Speeds: 9, Largest Cog: 38, Rear Der/Shifter Compatibility: microSHIFT ADVENT, Rear Derailleur Mount Type: 10x1 Standard,