Industry Nine Hydra Classic MTN Hubset - 28h | 20x110 Boost / QRx141 | 6-Bolt HG | Black

Specifications

• Model: H2MBBBRY1
• Series: Industry Nine Hydra Classic Mountain
• Generation: Original Hydra (now superseded by Hydra2)
• Color: Black
• Engagement: 690 points / 0.52 degrees
• Drive System: 6 independently-phased pawls, 115-tooth drive ring
• Front Axle: 20x110mm Boost thru-axle
• Rear Axle: QRx141 quick release
• Front Hole Count: 28h
• Rear Hole Count: 28h
• Rotor Mount: ISO 6-bolt (front and rear)
• Freehub Body: Shimano HG (HyperGlide), 8-11 speed compatible
• Spoke Standard: J-bend
• Hub Shell Material: 7075-T6 aluminum
• Bearings: 4-bearing layout with oversized axle and external seals
• E-Bike Compatibility: Class 1 compatible
• Origin: Designed and manufactured in Asheville, North Carolina, USA
• UPC: 197769449307

FAQ

Is this the original Hydra or the newer Hydra2?

This is the original Hydra hub (690 points of engagement, 0.52 degrees), released in 2019 and produced through 2024. Industry Nine has since launched Hydra2 with 870 points of engagement (0.41 degrees) and a thicker axle, but the original Hydra is still a top-tier hub with proven performance and shares the same in-house manufacturing process and lifetime engineering support from I9. We have these in stock from a prior order and are offering them at a significant discount to clear.

Why is the rear hub a quick release instead of a thru-axle?

This configuration is built for older trail and all-mountain frames that predate the 12mm thru-axle standard but still use 141mm rear dropout spacing. If your frame uses a 12x142 or 12x148 thru-axle, this is not the right hubset for you. Confirm your frame's rear axle standard before purchase.

What does the 6 pawl, 115 tooth drive system do that other hubs do not?

Standard ratcheting hub designs have all the pawls engage the drive ring at the same time, which limits the engagement points to the number of teeth on the drive ring. Hydra independently phases each of its six pawls so they engage at offset positions, multiplying the effective engagement points by 6. The result is a continuous procession of engagement points rather than a step function, producing the telepathic feel that defined the Hydra platform.

Can I service these hubs myself?

Yes. Industry Nine specifically designed Hydra to be serviceable with standard shop tools, no proprietary tooling required. Bearings, pawls, springs, and drive rings are all user-replaceable, and parts are available directly from I9. Most riders can do a full freehub service at home in under 30 minutes.

Best For

Wheel builders and riders rebuilding an older all-mountain or freeride bike that uses a 20mm Boost front fork and QRx141 rear dropout spacing, who want the proven Hydra engagement and made-in-USA build quality at a price that beats anything else in this performance tier. Also a great match for vintage downhill builds or restomod projects.