Industry Nine Hydra NON BOOST Rear 6 Bolts Hubs

Measure across the inside faces of the rear dropouts. 135mm or 142mm is non-Boost, which is what this hub is. 148mm is Boost and you’d want the Boost version instead; 157mm is Superboost, which is a different hub again.

As a rough guide, frames from roughly 2016 onwards are usually Boost and anything older usually isn’t – but there are plenty of exceptions, so measure rather than assume. Send us the frame make, model and year if you’d rather we checked. It’s the easiest thing to get wrong when buying a rear hub.

This non-Boost hub covers QRx135, 12×135 and 12×142 – so it suits older trail bikes and hardtails, and quick release or bolt-through frames alike.

The hub shell stays the same and the end caps change, which is why these hubs stay useful across several bikes. Tell us what your frame takes and we’ll confirm the right setup before you order.

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.

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.

Don’t assume more spokes is automatically better – plenty of wheelsets run 28 hole deliberately for a more compliant wheel that tracks better on rough ground. Rear wheels take more punishment than fronts though, so if you’re torn and riding hard, 32 is the safer default. Tell us the rim and we’ll confirm.