01
28 Spokes
Going light doesn’t mean recklessly cutting weight. We kept these wheels 28h for reliable performance and durability.
NOBL Ethos SL Wheelset
The Lightest NOBL Rim Ever
Paired with Ethos Ti70 hubs and Berd spokes, Ethos SL is one of the lightest XC race wheelsets in the world, built for real race-day performance.
1033
g
wheelset weight
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02
20.5mm Depth
2mm deeper than the Ethos XC rim, ensuring torsional stiffness and efficient power transfer.
03
Ethos Ti70 Hub
The perfect hub: hook-flange ratchet hubs with 70 points of engagement and lightweight titanium freehubs, designed with Berd and Erase.
Ride Feel
Pure Speed
The Ethos SL is a purpose-built ultralight race wheel designed to ride better, not just weigh less. With a 30mm internal width and a full 28-spoke count front and rear, it avoids the concessions of other ultralight race wheels. Every detail was optimized for performance — from an ultralight carbon layup engineered for explosive speed to a race-tuned rim profile.
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Rim Profile
The Engineering
Built For Race Day
The lightest NOBL rim ever, at a slender 270g, rotational mass is kept to an absolute minimum. They feature 30mm internal front and rear widths, a 20.5mm depth, and an ultralight layup delivering optimal torsional stiffness and power transfer for a race-day wheelset. Available only in 29” with a full 28 spoke count.
weight
270
grams
inner width
30
mm
depth
20.5
mm
bead thickness upper | lower
2.9 | 2.4
mm
hole count
28
h
erd
595
mm
Build Spec · NOBL Ethos SL Wheelset
1033 grams
Rims
Ethos SL 270g (28h, 29”)
Hubs
NOBL Ethos Ti70, Hook flange, Titanium Driver, 70T ratchet
Hub Spacing
Boost
Brake Type
Centerlock or 6-Bolt
Freehubs
XD, MS, & HG
Spokes
Berd PolyLight Dyneema
Nipples
Sapim Alloy Black Secure Lock
Decals
White, Chrome Silver, Chrome Gold, & Black
Valves
NOBL Tubeless Valves
nobl tech
wheel features
Ultralight Layup +
Designing a 270g mountain rim with a 30mm internal width, capable of building into a sub-1000g wheelset, is no small task. Delivering true race-day performance, precise handling, and efficient power transfer at that weight makes it exponentially more challenging.
The Ethos SL rim achieves this through an aggressively optimized ultralight layup, utilizing layers of T800 and T1000 carbon fibre, which have a significantly higher tensile strength-to-weight ratio than T700. These high-modulus materials, manufactured by Toray, allow us to reduce weight while providing leading impact resistance for the ultralight category. Compared to our XC rim platform, the SL adds 2mm of depth to prioritize power transfer. Berd spokes complete the system, reducing rotational weight while enhancing vibration damping and traction.
Wide & Reinforced Rim Bead +
Ethos rims feature wider, flared rim beads that increase the contact surface area at the outer diameter of the rim. This broader interface helps distribute impact forces across a larger area rather than concentrating load at a single point, improving overall impact resistance and durability.
Taking it a step further, the wide, flared bead is reinforced with a flexible material specifically developed to improve resistance to off-axis, one-sided impacts. On the trail, impacts are rarely evenly distributed across both rim beads; one-sided strikes are far more common.
Concave Profile +
The Ethos lineup introduces a concave profile developed to optimize torsional stiffness. This profile allowed us to reduce rim depth to improve compliance and fine-tune support, particularly when paired with BERD spokes.
Flatline Valves +
NOBL Ethos Wheels feature a raised, flattened landing pad designed specifically for secure valve stem installation. This precise fit keeps the valve firmly in place, reducing movement and minimizing the risk of air leaks, keeping your tire pressure consistent.
Optimized Tubeless Fit +
For the best overall tubeless experience, the bead seat width and height, along with the drop channel diameter, are precisely engineered. Most riders will be able to install a tubeless-ready tire without the use of levers and inflate the tire fully without the use of a powerful air compressor.
Raw Finish +
All NOBL rims leave our high-end steel molds with a natural, raw finish without the need for post-production sanding and finishing. Without this abrasion, the carbon fibres remain fully intact and encapsulated in resin, preserving their structural integrity. Producing a paintless carbon rim is more demanding, but the result is a rim that’s not only cleaner in appearance, but inherently stronger.
ethos ti70 hubs
Built to match the performance of Ethos rims and the world’s lightest spokes. Developed by NOBL in collaboration with Berd and Erase Components, it pairs a lightweight titanium freehub with a fast-engaging 70-tooth star ratchet system for a crisp 5.14° engagement, ensuring precise power transfer on every pedal stroke. Berd’s proprietary Hook Flange design makes spoke installation secure and straightforward while optimizing strength at the interface and maintaining compatibility with Berd PolyLight X spokes. At just 331g for a centerlock hubset, the Ti70 is a lightweight, durable, and highly efficient hub that maximizes the performance of Ethos rims and Berd spokes, making it equally capable for XC racing and aggressive enduro riding.
berd polylight spokes
Made from Dyneema®, Berd spokes offer an industry-leading strength-to-weight ratio—up to 12 times stronger than steel by weight—while weighing less than half of traditional steel spokes. Their fiber construction naturally absorbs high-frequency vibrations, reducing trail feedback and improving traction while delivering a smooth, controlled ride feel that remains efficient under pedalling forces.