Niner RKT 9 RDO 4 Star Shimano XT Mountain Bike 2021, Medium b4 mountain Specialized Ambush II Helmet Specialized Ambush II Helmet and Quick Start Guide The SRAM Force eTap AXS HRD brake shift System features simple and intuitive eTap shift logic and is AXS enabled for easy personalization Brakes feature contact point adjustment and reach adjust to customize hand and braking preferences The Force eTap AXS front derailleur features classic SRAM Yaw trimless cage technology with an optimized cage profile for SRAM Force front chainring combinations Battery placement on the front derailleur is streamlined to allow for more rear tire clearance The Force eTap AXS rear derailleur features Orbit chain management technology to keep the drivetrain quiet and secure Niner RKT 9 RDO 4 Star Shimano XT Mountain Bike 2021