The Rival AXS rear derailleur is the choice for road riding, for all cassette sizes from 10-28 to 10-36, for any terrain you coverChain management technology keeps the drivetrain quiet and secureAXS enabled for easy setup, personalization, and reliabilityLarger X-SYNC lower pulley for increased efficiencyCompatible with cassettes from 10-28T to 10-36TCompatible with both 1x and 2x drivetrainsBattery not includedRival eTap AXS12sp36BLKUPC/EAN/GTIN: 710845916809