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 – 12×150, 12×157
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.
Do I need Superboost or standard Boost?
This is the Superboost and DH version, running 12×157 Superboost or 12×150 DH end caps. Superboost frames measure 157mm across the inside of the rear dropouts; downhill frames are usually 150mm.
If your frame measures 148mm, that’s standard Boost and you want the Boost version instead – same hub, different width. Measure your dropouts or send us the frame make, model and year and we’ll confirm before you order.
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 instead of six bolts. This is the Centrelock version of the hub.
Match whatever your rotors already are; changing standard means buying new rotors too. Choosing fresh, Centrelock is quicker to swap and marginally lighter, but you need a cassette lockring tool and rotor choice is narrower – which matters more on a DH build, where big rotors get replaced often. 6-bolt gives wider choice and only needs a T25 key. We stock this hub in both.
Which freehub do I need – Hyperglide, Microspline or XD?
It depends on your cassette. Hyperglide (HG) covers 11-speed Shimano and SRAM’s 12-speed NX. Microspline is for Shimano 12-speed. XD is for SRAM Eagle 12-speed. Tell us which you need in the order comments.
If you might change drivetrain later, note that HG and XD share the same end caps while Microspline uses different ones – so swapping to or from Microspline means new end caps too.
Should I choose 28 or 32 hole?
For a downhill or Superboost build, 32 unless the rim says otherwise. This hub goes into wheels that get hit hard, and the extra spokes spread that load.
That said, let the rim decide – follow the rim manufacturer’s guidance for whatever you’re lacing to, and match the hole count if you’re rebuilding onto a rim you already own. More spokes isn’t automatically better; plenty of enduro wheelsets run 28 hole on purpose for a more compliant wheel. Tell us the rim and we’ll confirm.
