Completely re-engineered using insights gleaned from more than 100000 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 performance Rear Axle 12mm Thru x 157mm Cassette Body Type SRAM XD Color Black Skewer Included No Bearing Type Sealed Cartridge Weight 292 Designed for ebike Yes Defined Color Black Spoke Interface J-Bend Hub Drilling 32 Hub/Brake Compatibility 6-Bolt Disc