Chasing grams without giving up stiffness? The One-K RD-Ultimate wheelset is built around a patented fibre-spoke “star” that replaces conventional steel spokes, achieving sub-1 kg system weights from ~935 g per set. Matched to DUKE’s proven Baccara rims and the NON+ precision hub, RD-Ultimate is a pure climber’s and weight-weenie’s dream—best for lighter riders (system weight up to 95 kg). Available in 36 mm or 48 mm rim depths.

Why Riders Choose RD-Ultimate

• Absurdly light: wheelsets from ~935 g claimed—ridiculously quick to spin up on steep climbs.

• Fibre-spoke star: One-piece composite spoke sheets deliver weight saving vs steel with high lateral/torsional stiffness. Originates from research at Germany’s Leibniz Institute.

• Real-world rims: DUKE Baccara Ultra (21 mm internal) in 36 or 48 mm heights—stiff, versatile, tubeless-ready clinchers.

• NON+ hubset: self-ventilating, self-adjusting bearing play, ~45 engagement points for fast pickup.

• Custom finishing: raw or DLC-coated titanium nipples; decal colours to suit your build.

Key Specs

• Use: Road disc, tubeless-ready clincher

• Rim depths: 36 mm or 48 mm (front & rear configurable)

• Internal width: 21 mm (RD-Ultimate)

• Spokes/Nipples: 24 One-K fibre spokes; titanium nipples (Raw or DLC)

• Hubs: One-K / NON+; Centerlock, 12×100 (front) / 12×142 (rear); ~45 POE

• Freehub options: Shimano HG, SRAM XDR, Campagnolo

• Claimed weight: from ~935 g per set (configuration-dependent)

• Max system weight: 95 kg (rider + bike + kit)

• Included: rim tape, valves, One-K wheel bags

• Finish options: decal colours; Raw/DLC titanium nipples

Tyre Guidance

With a 21 mm internal width, the RD-Ultimate plays nicely with modern 25–30 mm road tyres (28 mm is a sweet spot for comfort and speed). Always check your frame/fork clearance and tyre brand’s pressure guidance.

Who It's For

• Weight-focused road riders and climbers wanting the lightest possible disc wheelset.

• Riders under 95 kg system weight who prioritise snap, stiffness, and a unique aesthetic.

Notes & Disclaimers

• Weight is a manufacturer claim and varies with depth/freehub/graphics.

• The RD-Ultimate is engineered for ≤95 kg system weight; if you need a higher limit, consider One-K RD-S/RD-X (up to 120 kg).

• One-K offers a crash-replacement programme and warranty—details via the brand.

What’s in the Box

• Front & rear wheels (configured depth)

• Tubeless valves & rim tape installed

• One-K wheel bags