Sram AXS enabled for easy personalization Orbit chain management technology keeps drivetrain quiet and secure A single rear derailleur for all gearing combinations, including 1x and 2x Improved motor and signal travel for faster shifting Larger X-Sync pulleys and ceramic bearings for increased durability and efficiency Compatible with existing eTap batteries **BATTERY NOT INCLUDED - BATTERY PART #530147 - SOLD SEPARATELY Red AXS 12sp 33 Short BLKUPC/EAN/GTIN: 710845823060