The SRAM Eagle Transmission XS-1270 Cassette is a 12-speed mountain bike cassette designed for SRAM’s T-Type Transmission drivetrains, offering a wide 10-52T gear range that balances climbing capability with high-speed efficiency for modern 1x MTB setups. Built around the Transmission system’s direct-mount derailleur architecture, it is designed for smooth shifting under load and improved drivetrain durability on aggressive trail and enduro terrain. Its gear progression provides usable cadence spacing across varied terrain, while the robust construction prioritizes long-term reliability for riders who regularly ride technical trails and demanding conditions.