Short Track XC | Ultralight XC

993 Grams

The world’s lightest 30mm internal-width production ultralight XC wheelset. Pure speed efficiency, it’s a cheat code for off-road racing, with Ethos SL rims, DT180 hubs and Berd Spokes.

Ultralight. Uncompromised. Unmatched.

993g is ridiculously light, but lightweight alone wasn’t enough. The SL180 is a purpose-built ultralight race wheel designed to exploit every meaningful gram. With a 30mm internal width and a full 28 spoke count front and rear, it avoids the concessions other ultralight race wheels make. Every detail serves speed. Revised carbon layups utilize T800 and T1000 layers to trim weight, and the rim profile is engineered specifically for the industry-leading hubs and spokes it's built with. The result is the world's lightest 30mm internal-width production XC wheelset.

28 SPOKES: Going light doesn’t mean recklessly cutting weight. We kept these wheels 28h for reliable performance and optimal ride feel.

993 g: The lightest 28h, 30mm int. width production ultralight XC wheels on the market.

20.5mm Depth: 2 mm deeper than the Ethos XC rim, ensuring torsional stiffness and efficient power transfer.

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, and a 20.5mm depth, delivering optimal torsional stiffness and power transfer for a race-day wheelset with an ultralight layup. Available only in 29” with a full 28-hole spoke count.

DT Swiss 180 Hubs

Exceptionally light and reliable at just 283g for a set, and engineered in Switzerland, these hubs feature ceramic bearings and a 36 or 54-tooth ratchet system  for reliable engagement and efficient power transfer. Designed for ultralight performance with a proven track record of reliability, DT180 hubs are the perfect match for the sub-1000g Ethos SL180 wheelset.

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.

Warranty

All NOBL rims come with a lifetime warranty, call it ride insurance. As the original purchaser, if you break your rims while using the product for its intended purpose, we will send you a replacement rim at no charge; you will just pay the cost of shipping.

The Ethos SL is a purpose-built ultralight race wheelset — not a conventional everyday XC platform. It tests to 105J impact strength, exceeding most SL competitors (typically 85–95J), achieved through an aggressively weight-optimized layup and ultra-thin sidewalls.

Compared to the Ethos SL, the Ethos XC is a more durable platform for everyday riding. At 1175g, it’s an exceptionally light wheelset while delivering 21% greater impact resistance, increased torsional compliance, and a more robust sidewall layup.

Rim Specs

Weight: 270g

Wheel Size: 29″

Inner Width: 30mm

Depth: 20.5mm

Bead thickness: 2.9mm upper, 2.4mm lower

Hole Count: 28h

Max PSI: 40

ERD: 595mm (Front and Rear)

Wheelset Specs

rims: Ethos SL 270g (28h, 29”)

hubs: DT Swiss 180 with ceramic bearings

hub spacing: Boost

brake type: Centerlock

freehubs: XD, MS, & HG

spokes: Berd Polylight Dyneema

nipples: Sapim Alloy Black (Polyax DS Securelock)

decals: White, Chrome Silver, Chrome Gold, & Black

Valves: NOBL Tubeless Valves (Upgrades to Peaty’s Valves available)