Features of the SRAM Red eTap AXS Hydraulic 1x Groupset The SRAM RED eTap AXS Electronic system is an intuitive, High Performance wireless groupset At the core of this drivetrain is AXS - the electronic integration platform that allows you to easily personalize the groupset right from your phone and enable your choices while riding Orbit chain management provides a reassuringly quiet, secure and smooth ride, whatever the terrain Groupset includes all electronic components for a 1x setup in a single package - hydraulic brake/shift lever pair, front and rear post mount disc calipers, 160mm disc rotors, rear derailleur, battery, charger and cord, and Quick Start Guide RED eTap AXS HRD Brake/Shift System Features simple and intuitive eTap shift logic and is AXS enabled for easy personalization The HydroHC brake platform includes a two-piece caliper for a more positive feel The RED eTap AXS rear derailleur Features Orbit chain management Technology to keep the drivetrain quiet and secure, and is enabled with SRAM AXS for easy personalization Rear derailleur includes optimized motor and signal travel for faster shifting, and is compatible with existing eTap batteries To complete your groupset, purchase a crank, bottom bracket, cassette, and chain Brake Caliper Type, Post Mount Brake Lever Actuation, Hydraulic Brake Compatibility, Disc Only Number of Chainrings, Single Brake Type, Disc Rotor Included, Yes Drivetrain Speeds, 12 Rear Der/Shifter Compatibility, SRAM eTap AXS