Industry Nine Hydra 2 Classic Front Hub - 20 x 110mm DH Boost 6-Bolt BLK 32HIndustry Nine Hydra 2 Classic Front Hub 20 x 110mm DH Boost 6 Bolt Black 32H. Completely re engineered using insights gleaned from more than 100000 original Hydra hubs in the field Hydra2 features a newly designed 65% thicker axle larger 6903 bearings with new labyrinth seals that ensure bombproof durability under the most demanding conditions. Designed specifically for trail enduro and downhill riders with the strength to handle full power ebikes