Completely re-engineered using insights gleaned from more than 100,000 original Hydra hubs in the field, Hydra 2 features a newly designed 65% thicker axle, larger 6903 bearings with new labyrinth seals, and enlarged pawl pockets that ensure bombproof durability under the most demanding conditions.6 Pawl Hydra 2 Freehub Body provides a groundbreaking 870 P.O.E. Hydra 2 Freehub body engages every .41 degrees yielding telepathic controlRefined drive ring and increased tooth counts on each pawl provide increased relability and engagement with less dragDesigned specifically for trail, enduro, and downhill riders with the strength to handle full-power ebikesScalloped flanges on Hydra2 j-bend hubs increase overall strength, and remove excess material for a lighter, stronger hubshellRevised axle design is 65% thicker with an improved stress washer designLarger, 5.5mm pawl pockets that evenly distribute force 26% better, preventing deformation of the pockets over years of useFull-contact radial lip seals paired with proximity dust shields keep grit and grime out, and lubrication inDurable 6903 bearings are used throughout for smooth, long-lasting performanceItem SpecificationsBearing TypeSealed CartridgeCassette Body TypeShimano Micro SplineColorBlackDefined ColorBlackDesigned for ebikeYesHub Drilling28Hub/Brake Compatibility6-Bolt DiscRear Axle12mm Thru x 148mmSkewer IncludedNoSpoke InterfaceJ-BendWeight292 Industry Nine Hydra 2 Classic Rear Hub Rear Hub UPC: 197769335341