To improve upon the previous generation, Industry Nine focused on enhancing durability with the Hydra 2 Hubs. By analyzing data from over 100,000 Hydra hubs in use globally, they systematically addressed potential weak spots, creating a hub that can handle the toughest riders and most extreme conditions. The Hydra 2 Rear Hub is the ultimate in mountain bike hub performance, built for the next generation of riders, bikes, and trails that demand nothing less than the best. Industry Nine Hydra 2 Rear Hub Features A 65% thicker axle that’s been redesigned to dissipate stress more effectively Larger 6903 bearings throughout , and a new labyrinth channel and full-contact radial lip seal to keep out elements that cause premature bearing wear Quicker 0.41° engagement and 60% less coasting drag than its predecessor A new, foolproof design to ensure consistent bearing preload, regardless of variations in axle tightness Larger, 5.5mm pawl pockets that distribute force 26% better, preventing deformation of the pockets over years of use Tougher metal for the drive ring and an extra tooth on each pawl, guaranteeing Hydra2 can easily handle the torque of the most powerful e-bike motors Hydra 2 Rear Hub Specs Spoke Type: J-Bend Rotor Mount: 6-bolt Holes: 28 hole Points of Engagement: 870 Drive Ring: 145 tooth Pawls: 6 Engagement: .41 degrees Material: Aluminum