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  • ONYX Racing Products Onyx MTB Rear Boost Hub
  • ONYX Racing Products Onyx MTB Rear Boost Hub Detail
  • ONYX Racing Products Onyx MTB Rear Boost Hub 3/4 Front
  • ONYX Racing Products Onyx MTB Rear Boost Hub Detail
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ONYX Racing ProductsOnyx MTB Rear Boost Hub

Item # ONY0002

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  • Black, 12x148, XD, 32H ($445.00)
  • Black, 12x148, HG, 32H ($445.00)
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Item # ONY0002

Onyx MTB Rear Boost Hub

ONYX Racing Products came about as a father's desire to provide his BMX racing son with a hubset that was faster engaging and smoother rolling than any other option on the market. Naturally, for BMX where starts are critically important as well as getting back on the gas after pumping, cornering, and jumping, lightning fast engagement makes a huge difference and those benefits carry over to the mountain bike side too. Whether you're pedaling out of a turn in a short track race to get a gap on your rivals, negotiating a technical climb, or simply want to coast without it sounding like a swarm of bees are chasing behind you, the MTB Rear Boost Hub from ONYX Racing Products is an excellent option with its patented sprag clutch rear hub transmitting pedaling power into forward momentum.

These hubs are made in the USA and the shell is machined from 7075 aluminum for strength and durability. It, like all Onyx hubs, spins on high quality ceramic hybrid bearings, which are lighter, smoother, and last longer than its steel counterparts. They are constructed to very tight tolerances and Onyx gives you the ability to adjust the bearing preload with a threaded collar and titanium cinch bolt, preventing overly tight or loose hubs by allowing for adjustments while mounted in the dropouts. The star of the show is its sprag clutch mechanism for instant engagement under power and instant disengagement while coasting. As a bonus, the hubs feature quiet operation and no coasting drag so you can take in the scenery and enjoy shredding the singletrack in silent bliss. We also really appreciate that the hubs are easily disassembled and can be serviced by a home mechanic. This particular version has 32 holes, Boost spacing, 6-bolt rotor mounts, and is available with a heat-treated hardened stainless steel Shimano HG freehub or SRAM XD driver.

  • A quick engaging and silent mountain bike rear hub with low drag
  • 7075 aluminum hub shell for strength and durability
  • Ceramic hybrid bearings reduce friction for less rolling resistance
  • Adjustable bearing preload extends the bearing life
  • Titanium pinch bolts help shed some weight
  • Non-contact seals keep out water, mud, and grime
  • Sprag clutch engages and disengages instantly
  • Made in the USA and backed by a 5-year warranty
Tech SpecsWeight
Tech Specs
[shell] 7075 aluminum, [bearings] ceramic hybrid, [bolts] titanium, [freehub body] stainless steel
Hub Type
Rear, Boost, Mountain
Rotor Compatibility
Spoke Count
Recommended Use
cross-country, enduro, trail
Manufacturer Warranty
5 year limited

Actual Weight

Actual weights are measured in-house by the Competitive Cyclist team.

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Black, 12x148, XD, 32H
Black, 12x148, HG, 32H

Claimed Weight

Claimed weights are provided by the vendor.

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Reviews & Community


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Silent, instant-engaging magic.

  • Familiarity: I've put it through the wringer

Got these hubs as part of a new wheel build and was wary about the extra weight. One ride into it I didn’t care about the weight. Engagement is instant but soft in a way—none of the “clunk” with engagement—and there really is something magical about bombing a long flowy descent with no freehub noise. And they’re beautiful. Seriously, just scroll past the weight and try these hubs. They’re amazing.

Unanswered Question

Can you get the 28h version of these hubs? Specifically the rear boost sram xd?