Developed for the most demanding enduro courses in the world, the Ibis Mojo HD4 Carbon XO1 Eagle Complete Mountain Bike marks a stark departure from the previous Mojo HD3 with its long, slack geometry paired with a piggyback shock that's tuned with greater progression to keep you from bottoming out on bigger hits. This reconfigured geometry and progressive shock tune is driven by the needs of the Ibis Enduro Race Team competing on the world's most demanding enduro courses, as opposed to the previous Mojo HD3, which focused more on agility and playfulness over all-out speed. Delving into the Mojo HD4's revised geometry, you'll find it's not just a bit longer, it's actually much longer than before, with the bike's reach being one size longer than the Mojo HD3 for medium through extra-large sizes. By growing considerably longer in reach, the Mojo HD4 gives riders a roomier cockpit, eliminating the need to size up many riders found with the HD3. These longer figures translate to the HD4's wheelbase as well, which has grown considerably to offer higher levels of confidence when you're pushing the bike to the absolute limit on blistering-fast downhills. 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 for riding on trails and race courses with tricky off-camber sections, as the slacker head tube angle keeps the bike planted to the trail, instead of teetering off the edge. Looking to the Mojo HD4's suspension, it's no surprise that Ibis retains the praised kinematics of the DW-Link platform, namely its ability to pedal efficiently with anti-squat characteristics paired with a linear feel (until it ramps up at the end) for a ...