Industry Nine Hydra 2 MTB Front Centerlock Disc Hub
Industry Nine machines and anodises it in Asheville, North Carolina, in every color it makes. This page covers the Industry Nine Hydra 2 MTB Front Centerlock Disc Hub.
The Hydra 2 is not sold bare. You choose the rim and the rest of the build in the configurator, and it ships from our shop in Georgia laced, tensioned and trued by hand.
Design and construction
The Hydra 2 keeps that and makes the parts around it bigger.
The hubshell is machined from aluminum bar with J-bend flanges in 28 and 32 hole, anodized in Industry Nine's full color range, with centerlock or 6-bolt rotor mounts and end caps for Boost, Superboost and standard spacing.
Because the front Hydra 2 has no freehub, it is the hub that asks for the least: a spin of the axle to check the bearings once a season and nothing else. The flanges, bearings and seals are the same as the rear's, the axle converts between the front standards with end caps, and the rotor mounts the same way. Choose it to match a rear of the same model, or on its own for a fork that needs a new front wheel.
How it rides
We build the Hydra 2 for trail, enduro, downhill and e-bike wheels; the thicker axle and bigger bearings make it a better e-MTB hub than the original.
On the road or the trail the front hub's job is to disappear: spin freely, keep water out, and hold the flanges still so the wheel tracks where you point it. The front Hydra 2 does that with the same bearings and seals as the rear and none of the rear's complexity, and because a front wheel carries less load and no torque it stays true longer than the rear on the same rim. When the rear finally needs a look, the front usually does not.
Specifications
| Position | Front |
|---|---|
| Axle options | Thru Axle 15x110mm Boost Front, Thru Axle 15x110mm Boost Front |
| Drillings | 32h |
| Spoke head | J-bend |
| Brake | centerlock disc |
| Left flange diameter | 59.5 mm |
| Right flange diameter | 46 mm |
| Left center-to-flange | 28 mm |
| Right center-to-flange | 41 mm |
| Spoke hole diameter | 2.6 mm |
| Weight | 139g |
| Material | Aluminum |
| Finishes | black, blue, bronze, gold, green, lime green, orange, pink, purple, red, silver, turquoise |
This listing
This is the centerlock version: Thru Axle 15x110mm Boost, Thru Axle 15x110mm Boost With Torque Caps, 32h drilling, about 139g, in black, blue, bronze, gold, green, lime green, orange, pink, . Same internals and flanges as every other Hydra 2; only the mount and axle differ.
This is the centerlock Hydra 2: the rotor sits on a spline and a lockring holds it, which saves weight over six bolts and makes swapping rotors a one-tool job. If your rotors are 6-bolt, a centerlock adapter fits them, or choose the 6-bolt version of the same hub.
Sizes, fit and compatibility
J-bend spokes in any gauge; we build most Hydra 2 wheels with Sapim Race, D-Light or CX-Sprint spokes or DT Competition and brass nipples, and Industry Nine also sells a straight-pull version for its own alloy spokes.
It pairs naturally with Industry Nine's own Grade 300, Triad and Sector rims, and with Reserve, ENVE, We Are One, Nox, DT Swiss, Race Face and Stan's rims that match its drilling. Give the configurator your bike type and weight; it picks a sensible spoke count and lacing pattern, which you can override.
Put it in a custom wheel
Build a custom wheel around the Industry 9 Hydra 2 MTB Front Centerlock Disc Hub — the link drops you into our Custom Wheel Program with this hub pinned, ready for you to choose the rest. It is set up for gravel and road disc, mountain bike, MTB single-speed, fat bike and tandem and e-bike builds.
What Industry Nine says about testing
Industry Nine states it "has been anodizing & machining hubs, spokes, and drive systems in Asheville, NC since 2004" and that it engineers and manufactures every component of its hub and wheel systems in-house, including hub shells, axles, spokes and anodizing: "If it moves inside an I9 hub, we made it." Coverage of the Hydra2 launch (March 2025) reports Industry Nine drew on data from over 100,000 Hydra hubs in use to redesign the hub, with a 65% thicker axle "engineered for superior stress dissipation", larger 6903 bearings throughout, a labyrinth channel and full-contact radial lip seals against contamination. Industry Nine publishes no bearing-cycle, salt-spray, ISO 4210 or laboratory test figures for its hubs.
Warranty: Industry Nine states "Hubs are covered for five years against defects in materials and workmanship." Years 0-2 include parts, labor and return shipping; in years 3-5 parts are covered and labor and shipping may apply. Warranties apply to the original purchaser only with proof of purchase from a certified dealer; bearings and other normal wear items are excluded. Industry Nine says service needs only basic tools, "no proprietary tools are required".
Certifications
- Made in USA (Asheville, NC) — Industry Nine states hubs, spokes and drive systems have been anodized and machined in Asheville, NC since 2004; site tagline "HANDBUILT - ASHEVILLE, NC - KAMLOOPS, BC" (source)
- 5-year hub warranty — Parts, labor and return shipping years 0-2; parts only years 3-5; original purchaser; bearings excluded (source)
Sources on Industry Nine's site:
- About Industry Nine
- Industry Nine Warranty
- Industry Nine Hydra 2 Hubs (product page)
- Industry Nine Support Documents
- Industry Nine Hydra2 Support
Industry Nine publishes those results; ProWheelBuilder builds the hub into a wheel and does not test it in a lab.
Building it at ProWheelBuilder
Industry Nine makes the Hydra 2 in Asheville, North Carolina; ProWheelBuilder is an independent custom wheel builder in Georgia and not the manufacturer. Every Hydra 2 wheel we build gets spokes cut from the measured ERD of the rim, staged tensioning with a gauge, stress relief and a final true before it ships.
In the configurator you will only see parts that fit this drilling; combinations that are not made are struck through, and the price updates as you pick.
Warranty
Industry Nine's warranty. Industry Nine covers its hubs against defects in materials and workmanship for five years from purchase, with two years on the anodized finish. Its alloy and carbon rims carry a lifetime defect warranty to the original purchaser, with parts, labor and return shipping covered for the first two years and parts thereafter. Bearing wear, impact and crash damage are not defects.
ProWheelBuilder. Built into a wheel by us, this part is covered by our own one-year wheel warranty on top of the maker's. For a year we replace broken spokes whatever caused them, and we cover the labor on the wheel - truing, re-tensioning, a rebuild if it needs one. If a rim or hub fails and its maker covers it, we run that claim for you; if the maker says no, you get an eligible replacement rim or hub at 25% off retail. You pay the shipping each way. Wheels built from parts you send us are excluded.
Full terms are on our Policies & Warranty page.
Hydra 2 MTB Front Centerlock Disc Hub questions
Will my rotors fit this hub?
This is the centerlock version, so a splined centerlock rotor drops on and a lockring holds it - one tool, no six bolts to torque or lose. If your rotors are 6-bolt they will fit with a centerlock adapter, or take the 6-bolt version of the same hub, which is a separate listing.
Is the Hydra 2 e-bike rated?
Yes. The thicker axle and larger bearings were designed with e-MTB loads in mind; tell the configurator it is an e-bike and it picks the spokes.
Which axle spacing does it fit?
Thru Axle 15x110mm Boost Front or Thru Axle 15x110mm Boost Front. Measure between the inside faces of your dropouts if you are unsure, or text us.
Does it need special spokes?
No. It takes standard J-bend spokes, which the configurator offers in every gauge and finish we stock.
How long will the wheel take?
Build time comes down to parts availability rather than bench time. The estimated ship date is shown in the configurator before you check out.
Not sure? Text or leave a voicemail on 470-253-0929 or email info@prowheelbuilder.com — you will be talking to the people who build the wheels.
