Industry Nine Hydra 2 Classic Rear Hub - 12 x 157mm 6-Bolt XD Black 28H MFPN=HB4UKA-213 Only compatible with Dura Ace

Only compatible with Dura Ace 9100/9150 and Ultegra 8000-SS/8050-SS

Pair that with a parts list that just doesn’t quit (

QuickFit temples for a customized fit

description 1/1 6-bolt/Center Lock mountain hub bearing kit

Index and Micro-adjust front shifter options

Industry Nine Hydra 2 Classic Rear Hub - 12 x 157mm 6-Bolt XD Black 28H MFPN=HB4UKA-213 Only compatible with Dura AceIndustry Nine Hydra 2 Classic Rear Hub 12 x 157mm 6 Bolt XD Black 28H. 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