Delivering crisp and swift gear changes to your beloved 10-speed mechanical drivetrain, the SRAM FORCE Rear Derailleur WiFli adopts a longer cage than its shorter sibling to fit a 32-tooth cog and conquer steep inclines. The WiFli uses SRAM's two-spring design and Exact Actuation to provide the strength needed for faster and more powerful shifts, and the accuracy required to precisely navigate up and down the cassette. SRAM calls it "a more tolerant" derailleur, meaning it's easier to set up, stays in adjustment longer, and provides more accurate shifting.The cage is carbon to boost strength and drop weight, while the pulley bearings are made of durable steel. The derailleur is designed to work with 2x SRAM 10-speed drivetrains.