If you've never witnessed a professional enduro race, it's hard to conceptualize how fast the top riders hurtle themselves downhill where one spill equals disaster. Then of course, riders have to pedal back up to complete another stage without the convenience of a lift or shuttle, meaning their bikes have to be well-rounded enough for brutal climbs up thousands of vertical feet. Driven by this style of professional enduro racing, the Ibis Mojo HD4 Carbon XT 1x Complete Mountain Bike features a longer, slacker geometry that inspires confidence when you're pushing things to the absolute limit on wicked descents with technical rocks and large drops--all without forgoing its ability to propel itself back uphill. This longer, slacker geometry marks a large departure from the previous Mojo HD3, which focused on agility and playfulness over all-out speed. The Mojo HD4 has a much longer reach that's approximately one size larger for medium through extra-large frames (small frames get a longer reach that's not as drastic to preserve fit for smaller riders). By growing considerably longer in reach, aggressive riders no longer find the need to size up like with the Mojo HD3. These longer figures translate to the wheelbase as well, which has gotten much longer (as much as two inches for large frame) for higher levels of composure and less squireliness when you're riding downhill at higher velocities. Not only is the Mojo HD4 much longer than the previous version, but it's also much slacker for greater stability when you're plunging into formidable downhill sections. Ibis played around with different head tube angles until they settled on 64. 9-degrees, which they claim offers greater downhill stability and higher lean angles before it loses traction. The second part is especially important on trails and courses with tricky off-camber sections, as the slacker head tube keeps the bike planted to the trail without feeling like it's going to plunge down the fall line. Looking ...