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Blacklabel XC 259 Hydra 29in Boost Wheelset

5 out of 5 stars
1 Review

Style & Size:


Blacklabel XC 259 Hydra Boost Wheelset

If you're into cross-country, you're likely into fast, lightweight, stealthy wheelsets. And Reynolds brings their elite Blacklable and MR5 technology to the start line with the XC 259 Hydra 29in Boost Wheelset. Using their varied carbon layup patterning, known as MR5, Reynolds goes to significant lengths to ensure the asymmetric design is robust and compliant to ensure fast accelerations, stable handling, and precision steering throughout the entire course. The asymmetrical rim profile allows the XC 259 to achieve more even spoke tension across the rear wheel to help boost the whole wheel-system's performance. Meaning you'll have increased handling in hard turns, more stable accelerations, and can make full use of the boost spacing opportunities on your bike.

Laced to Industry Nine's well-known Hydra hubs, the XC 259 offers engagement in a wicked-fast 0.52-degrees for near-instantaneous power to the drivetrain in critical sections on trail and for the finish. The XC 259 comes in HG, MicroSpline, and XD configurations and is backed by a lifetime warranty.


  • Reynold's Blacklabel mountain wheelset for cross-country racing
  • Strong carbon layup allows for top performance in a lightweight rim
  • Industry Nine Hydra hubs are immediately recognizable and race-ready
  • Asymmetrical shape lends better balance and more even spoke tension
  • Hookless rim profile matches well with tubeless tire for ease of installation
  • Ideal depth both in spacing and design for your cross-country courses
  • Item #REYE00F
Rim Material
MR5 carbon fiber
Wheel Size
Rim Depth
Rim Width
[internal] 25mm, [external] 30mm
Brake Compatibility
Industry Nine Hydra
Front Axle
15 x 110mm Boost
Rear Axle
12 x 148mm Boost
Sapim CX-Ray
Spoke Nipple
external alloy
Spoke Count
28 / 28
Claimed Weight
[set] 3lb 0.7oz (1380g)
Manufacturer Warranty

Overall Rating

5 based on 1 ratings

Review Summary

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5 Stars - 1 reviews

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Kyle BGearhead
5 out of 5 stars

November 28, 2020

race xc

I've put it through the wringer

actually sold my enve's and got these, sacreledge I know. they are super light, I haven't had an mtb wheelset this light. raced on them a full year now and have held up with not a single issue. the hydra hubs are phenominal, it doesn't get any better. engagement is superb, they roll smooth and have been dependable through whatever I put them through. I actually just ordered another set of these for another bike in our household for this next season. highly recommended wheelset from a company sometimes overlooked. I would reccomend considering them against any you're looking at.