The cassette is the shining star of the new SRAM Eagle Transmission groupset, and the SRAM XS-1295 X0 Eagle Transmission 12-Speed Cassette is built to hold up to the wear and tear enduro racing and E-MTBs. The new Transmission cassette is only compatible with Transmission derailleurs and Transmission T-Type chains. The massive 520% gear range gives us tons of options, whether we're pointed straight up the hill or bobbing and weaving through insanely technical rock gardens. The full X-Sync design shifts better the harder we pedal. Plus, the Dark Polar finish isn't just for looks. It features an electroless nickel plating for better corrosion- and wear-resistance so we can spend more time riding and less time fixing bikes.