The SRAM Force AXS XG-1270 Cassette is optimized for electronic shifting. It features X-Range gearing technology and a 10-tooth small cog to progress fluidly and efficiently. The XG-1270 cassette is designed to operate with XDR driver bodies. FEATURES: Features at least five one-tooth jumps for a smoother gear progression Mini cluster construction reduces weight and increases durability 10-tooth start helps provide a wider gearing range Designed to work with an XDR driver body SPECS: Cassette Body Type: SRAM XDR Drivetrain Speeds: 12