01
1175 Grams
Obscenely light, impressively capable. Ethos XC wheels are built for the long haul and save 100g over our lightest TR35 wheelset.
NOBL Ethos XC Wheelset
BC-Tough XC
Built for the most demanding cross-country terrain, the Ethos XC is our ultimate technical race wheel. It’s the go-to choice for NOBL athletes tackling brutal courses like Moab Rocks, the BC Bike Race, and the Breck Epic.
1175
grams
wheelset weight
Alternative Produc
These other products might interest you
02
Compliant & Strong
21% stronger than the Ethos SL, with reinforced sidewalls, Ethos XC is built to take on rough terrain with poise. An 18.5mm deep rim profile ensures compliance and grip that you can count on.
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
Compliant, Light, and Strong: Pick Three
Sub 1200g is obscenely light, but weight alone was not enough. The Ethos XC was built to ride better. Featuring shallow 18.5mm rims with front and rear-specific designs, these wheels are built for technical XC riding on the roughest terrain. Compliant and composed, Ethos XC rims are 21% stronger than the Ethos SL, with a more robust sidewall layup. Built with Berd spokes, they are wheels you can trust that fight fatigue on epic days on the trail.
//
Front - Rim Profile
The Engineering
Shallow By Design
The shallowest in the Ethos Series with an 18.5mm depth, these rims are made for the perfect balance of efficiency and compliance. Even with featherweight construction, reinforced sidewalls and layups make the Ethos XC 21% stronger than the Ethos SL. This gives them real-world durability, with the sidewall able to withstand strikes from rocks or debris that gets tossed into the wheel when the going gets rough.
With front and rear specific rim designs, Ethos XC is precisely tuned for XC racing. Up front, a lightweight, compliant construction minimizes rotational mass and enhances grip. Out back, a reinforced layup and wider rim lips increase impact resistance and tire support, engineered to withstand repeated hits.
Weight: 295g Bead thickness: 2.9mm upper, 2.4mm lower
Weight: 385g Bead thickness: 3.1mm upper, 2.6mm lower
weight F | R
295 | 385
grams
inner width
30
mm
depth
18.5
mm
Front bead thickness Upper | Lower
2.9 | 2.4
mm
rear bead thickness Upper | Lower
3.1 | 2.6
mm
erd
599
mm
Build Spec · NOBL Ethos XC Rear Wheel
1175 grams
Rims
Ethos XC 295g front, 385g rear (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
Optimized Torsional Flex +
Ethos rims are intentionally shallow for a more compliant ride feel. Reducing rim depth lowers overall torsional stiffness, allowing the wheel to absorb impacts while simultaneously introducing the right amount of lateral deflection, keeping you glued to your line, particularly on rough off-camber terrain. The result is a wheel that wants to go faster, providing precise tracking without feeling harsh.
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.
Front / Rear Specific +
Ethos Enduro, Trail, and XC platforms use dedicated front and rear rim constructions. The front rims are lighter and more compliant, improving traction and reducing rotational weight. The rear rim is engineered to withstand harder hits with a stronger layup and wide reinforced rim beads that increase impact resistance.
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.