Top Fuel 9.9 X0 AXS Gen 4 is an ultra-light and capable carbon trail bike built for soaring up climbs and rallying over miles of singletrack. This top-level build delivers the performance you want, with a RockShox Ultimate suspension package (120mm/130mm), and SRAM’s wireless X0 AXS transmission that shifts smoothly and easily, especially under load. It’s topped off with carbon wheels to keep your ride light from top to bottom.