Check the listing for details. microSHIFT M21 Rear Derailleur - 6 7 Speed Super Short Cage Dropout Claw. Color: Black, Condition: New. Listed at 14.90 USD. M21 rear derailleurs are designed to work with 6- and 7-speed road and mountain shifters. Enjoy the wide variety of bikes you can get going again with M21 rear derailleurs.33t chain wrap capacity. Robust composite and steel construction. Compatible with 6- and 7-speed mountain and road systems. Item Specifications: Cage Length, Short, Chain Wrap Capacity (teeth), 33, Color, Black, Drivetrain Speeds, 6, Drivetrain Speeds, 7, Largest Cog, 34, Rear Der/Shifter Compatibility, Mountain, Rear Derailleur Mount Type, Dropout Claw Hanger, SHIPS TODAY! Order before 1:30PM EST, M - F, and this item ships the same day! HAVE A QUESTION?Expert customer service by bike experts! A Real Brick And Mortar Retail Bicycle Shop with people you can talk to! Contact Us! (9-5 Mon-Fri, 12-4 Sat & Sun EST) Chat With Us