Please select Freehub (Hyperglide, Microspline or XD) and/or End Caps from HERE after your selected hub has been added to the cart.
Compatible End Caps – 15×110, 15×110 Torque, 20×110 Boost
Industry Nine Classic hubs are the heart of your wheelset, everything revolves around them, literally. Every Classic mountain hub is made start to finish in our Asheville, NC machine shop. From turning and milling bar stock 7075-T6 aluminum for shells, axles and encaps, wire EDM cutting A2 tool steel for pawls and driverings, to our own in-house anodization lab, every step of design, engineering, manufacturing and assembly is done on premises to our exacting standards.
Hydra Classic mountain hubs are loaded with features every rider will appreciate such as revolutionary 0.52° engagement, generously low weights and an intuitive layout that can be serviced without any proprietary tools. Our range boasts a universe of standard options in terms of axle fit, spoke hole drillings, disc rotor mounting, freehub bodies, and colors.
Will this fit my fork?
This is the Boost version, so it suits any fork with 110mm hub spacing. It runs 15×110 Boost, 15×110 Torque Cap, or 20×110 Boost, depending on your fork.
Most modern forks are plain 15×110. RockShox forks with the wider 31mm inset crown take Torque Caps. Older or heavy-duty forks use a 20mm axle. If your fork is 100mm spacing rather than 110mm, you want the non-Boost version instead – tell us the fork model and we’ll confirm which you need.
What is Centrelock, and do I need it?
Centrelock is Shimano’s splined rotor mount – the rotor slides on and is held by a lockring rather than six bolts. This is the Centrelock version of the hub.
Match whatever your rotors already are. Changing standard means buying new rotors too, which is rarely worth it. If you’re choosing fresh: Centrelock is quicker to swap and marginally lighter, but you need a cassette lockring tool and rotor choice is narrower. 6-bolt gives you wider rotor choice and only needs a T25 key. We stock this hub in both, so tell us which suits your rotors.
Should I choose 28 or 32 hole?
Let the rim decide, and don’t assume more spokes is automatically better. Plenty of enduro wheelsets are specced 28 hole on purpose – a slightly more compliant wheel tracks better and finds more grip on rough ground than a stiffer one does.
Follow the rim manufacturer’s guidance for the rim you’re building onto; they’ve tested it. If you’re replacing a hub in an existing wheel, match what your rim already has. Tell us the rim and we’ll confirm before you order.
Can I build this with normal spokes?
Yes. This is the Classic hub, which takes standard J-bend spokes – so any decent spoke will do and you’re not tied to Industry Nine’s proprietary alloy ones. That’s the difference between these and I9’s System wheels, which is where most of the confusion comes from.
We build wheels in-house, so if you’d like it laced to a rim, tell us the rim and spoke count and we’ll quote the build with it.
