Juego de ruedas Reynolds Blacklabel 349 29

The Reynolds Blacklabel 349 29 Wheelset is a carbon trail wheelset built around a straightforward conviction: that performance and durability don't have to be mutually exclusive. Where a lot of carbon mountain wheels ask you to choose between light and tough, the 349 is engineered from the ground up to deliver both — a hookless carbon rim with 34mm internal width, paired with the Reynolds/I9 co-branded Blacklabel Hydra hub, and finished with Sapim CX-Ray bladed spokes. The name tells you what you need to know: 34mm internal, 29-inch wheel.

The rim is built on Reynolds' MR5 construction platform — the fifth generation of their mountain rim architecture — incorporating the IDM (Impact Dispersing Matrix) carbon layup originally developed for their downhill program. IDM isn't marketing language; it's a carbon fiber arrangement designed to absorb and distribute impact forces that would crack a conventional rim. The result is a hookless tubeless-ready profile that runs wide enough to properly support modern tire volumes at lower pressures, with an asymmetric cross-section that offsets the rim toward the drive side. That offset equalizes spoke tension across both flanks of the rear wheel — a detail that matters for long-term reliability on rough terrain where spokes take sustained punishment.

At the hub, Reynolds and Industry Nine developed the Blacklabel Hydra specifically for this series. The Hydra is a 6-pawl design with 0.52-degree engagement — among the tightest available — CNC machined from aluminum alloy. That near-instant pickup pays dividends on technical climbs and punchy trail features where a slow-to-engage freehub costs you momentum at the worst possible moment. Center Lock disc interface provides clean, consistent brake rotor mounting, and the axle standard is traditional non-boost: 100mm front and 142x12mm rear.

Design Benefits

1. 34mm internal width is built for modern trail tires. Running a 2.3–2.6" tire on a 34mm-wide rim gives you a properly supported casing, better cornering stability, and a solid platform for tubeless setups at lower pressures. The wide-internal profile matches where tire technology has landed — not where it was five years ago.
2. IDM carbon construction prioritizes impact resistance. Reynolds developed the Impact Dispersing Matrix layup for downhill racing, where rim strikes are frequent and catastrophic failures aren't an option. Applied to the 349, this approach gives a trail wheelset a level of structural resilience that's rare in the carbon market at this weight class — and backs it with a lifetime warranty.
3. Asymmetric rim profile equalizes spoke tension. On a rear wheel, drive-side spokes always run tighter than non-drive side due to cassette positioning. The offset rim profile moves the spoke bed toward the drive side, reducing that tension imbalance across both flanks. Even spoke tension means better long-term durability on demanding trail surfaces where wheels take asymmetric loads constantly.
4. I9 Hydra hub delivers near-instant engagement. With 6 pawls and 0.52° of engagement, the Blacklabel Hydra picks up drive almost immediately when you push on the pedals. On technical climbs or tight switchbacks where you're weighting and unweighting the cranks rapidly, that responsiveness keeps the power where it belongs.
5. Sapim CX-Ray spokes bring race-grade reliability to trail use. CX-Ray bladed spokes are the benchmark for high-performance wheel building — stiff under load, aerodynamically profiled, and built to tight tolerances. A 28/28 spoke count with 3x lacing provides both resilience and efficient power transfer across demanding terrain.

Final Take

The Reynolds Blacklabel 349 29 is a wheelset built for riders who want carbon performance without the anxiety of treating their trail wheels like museum pieces. The IDM construction and lifetime warranty aren't just reassurance — they reflect a genuine engineering commitment to durability. The 34mm internal rim, asymmetric profile, and I9 Hydra hub round out a package that's technically sophisticated without being fragile. Note that this is the non-boost version (100mm/142mm axle spacing) — confirm compatibility with your frame before ordering. For riders on non-boost 29er frames who want top-tier carbon wheels that can take a beating and keep rolling, the 349 makes a compelling case at $2,299.99.