'XR' = 'Xtra Rad' here at Marin, and we pulled out all the stops with the XR AXS take on the Alpine Trail. Not only did we stack the bike with Ultimate-level RockShox suspension, but took the drivetrain up a notch with SRAM's GX Eagle AXS wireless 12-speed drivetrain. SRAM's Code Bronze brakes provide tenacious stopping power with their 4-piston calipers and 200mm rotors.