Updated version of the original SRAM RED eTap rear derailleurMechanical necessities such as a carbon pulley cage, ceramic pulley bearings, and anodized alloy artfully blend with proprietary electronic advancements to deliver a shifting wonderLarger X-SYNC pulleys and ceramic bearings for increased durability and efficiencyCompatible with existing eTap batteries - battery not includedOrbit chain management technology keeps drivetrain quiet and secureFits all 11-speed SRAM road cassettes up to 11-32t2x and 1x compatible11sp32ShortBLKUPC/EAN/GTIN: 710845854347