Sram rival etap axs 12 speed rear derailleurbenefitting from wireless electronic etap shift logic, this 12 speed rear derailleur provides intuitive shifting, easy setup and reliability on your road bike'. '.strtoupper('s')ram has also equipped this model with a rock solid aluminium cage with steel pulley bearings, so you'll benefit from the best balance of strength, durability and performance on every mile of road'. '.strtoupper('s')ram axs enabled road bike rear derailleurthis rear derailleur is low on complexity, but rich with features'. '.strtoupper('s')ram has equipped it with its renowned axs wireless technology, which allows for easy personalisation and control on your road bike'. '.strtoupper('t')hanks to its etap shift logic, it delivers intuitive shifting, easy setup and reliability that has been proven at the highest levels'. '.strtoupper('a')xs technology means personalisation is in your hands.the precision and reliability of 12 speed etap axs, now at a whole new level'. '.strtoupper('o')n any surface you can imagine, in any drivetrain configuration, the rival etap axs rear derailleur will handle it'. '.strtoupper('s')ecure chain management and fast, precise shifting make for a smooth and quiet ride, every time'. '.strtoupper('w')ireless electronic etap shift logic for intuitive shifting, easy setup and reliability compatible with both 1x and 2x drivetrains 36t cog max derailleur works with 10 28, 10 30, 10 33, and 10 36 cassettes sram axs enabled, allowing easy personalisation chain management keeps the drivetrain quiet and secure x sync pulleys for increased durability and efficiencyfeatures cage material aluminium pulley bearings material steel use road speed 12 speed cage medium cage max tooth 36 battery included not included, battery available separatelytechnologies axs enabled axs is sram's bike component integration system that connects electronic bicycle components and software'. '.strtoupper('c')ontrol axs lets you connect your axs enabled components to a mobile app, where you can assign custom actions to your controls'. '.strtoupper('e')verything speaks the same language, and you can even combine road and mountain bike parts to build the party bike of your dreams'. '.strtoupper('p')ersonalise wireless controls open the door to new levels of customisation'. '.strtoupper('w')ith axs, you can personalise your component behavior to match your riding style and preferences'. '.strtoupper('t')urn on enhanced shifting modes, or reassign shifting actions'. '.strtoupper('m')easure the axp mobile app and axs web allow you to monitor your bike's performance and readiness'. '.strtoupper('i')t's an easy way to keep tabs on your battery levels—including the cr2032 batteries in etap shift levers—and keep axs component firmware up to date'. '.strtoupper('a')xs web analyses your ride files specific to shifting, gear use, power zones, and tyre pressure, so that you can quickly and easily learn more about how your bike is working for you and consider adjustments.buy sram components from chain reaction cycles, the world's largest online bike store.