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 Front 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 Front 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 A new, foolproof design to ensure consistent bearing preload, regardless of variations in axle tightness Hydra 2 Front Hub Specs Spoke Type: J-Bend Rotor Mount: 6-bolt Holes: 28 & 32 hole Material: Aluminum