Designed specifically for disc brakes, the DB405 UltraDark and DB508 UltraDark offer first-class performance with a unique design featuring a lower front and higher rear rim height. The new dark black design complements a variety of frames. Upgraded hubs and spokes provide faster and more stable responses, making this wheelset an optimal choice for performance enthusiasts.

Integral Design, Lighter and Faster

Riders want wheelsets that are lighter, stiffer, and faster. EXAR engineers have risen to the challenge with Ultra wheelset to help riders ride faster in the race. The EXAR UltraDark wheelset applies HI-MOD T800 carbon fibre, following the integrated and systematic design. The primal materials allow a great reduction in weight while retaining outstanding stiffness. These help riders get a smooth start and faster acceleration.

Lower Front Wheel and Higher Rear Wheel Design

The EXAR UltraDark wheelset features a new design concept of a low front wheel and a high rear wheel. While ensuring high inertia of the rear wheel, also keeps the controllability of the front wheels, allowing the rider to ride more efficiently and stably.

30mm Width Rim, More Aerodynamic and Comfortable

A 30mm width rim and 23mm internal width are purely designed for disc brake structure. It ensures optimal aerodynamic performance in complex wind conditions, improving stability in crosswinds as well.
After installing the 28-32c tyre, the contact surface between the tyre and rim is flat. As a result, It creates a flatter aerodynamic surface and enhances cycling comfort.

Full Carbon Fibre Spokes, Contribute Ultra-Stiffness

EXAR UltraDark carbon fibre wheelset features HI-MOD T800 carbon fibre spokes. Each spoke weighs only 2.8g, 30% lighter than top-level steel spokes. Carbon fibre spokes have higher tensile strength and can withstand 30% more tensile force. Lower strength loss of transmission brings higher driving efficiency.
The wheelset applies a 2:1 balanced lacing pattern, which distributes tension perfectly. The spoke tension of the rear-wheel drive side is 130kgf±10%, and the non-drive side is 110kgf±10%.

Flat Engagement Ratchet Design

Details reveal the optimal configuration. Adopt a 36-tooth flat ratchet, which has tighter engagement with a larger surface. This can make the ratchet more durable, with fast and precise engagement as well as stability.

Improve Flange Diameter, Extending Endurance

The flange diameter has been calculated scientifically in terms of the stiffness of carbon fibre spokes. We reduce the amount of stress concentration point where the spoke contacts with the hub, thus improving driving stiffness and extending endurance.

Specifications

Brake: Disc Only
Rim Height: Front Wheel - 50mm, Rear Wheel 58mm
Wheel set Weight: 1390g ±3%
Rider/Bike Weight  110 kg's Maximum
External Rim Width: 30mm
Internal Rim Width: 23mm
Bearings - Standard
Rim Material: HI-MOD T800 Carbon Fiber
Spokes: HI-MOD T800 Carbon Fiber 9 (Front wheel tension: 110kgf±10%. Rear Wheel Tension: Drive Side 130kgf±10%, Non-drive Side 110kgf±10%)
Ratchet: 36T (Compatible with DT System. Replaceable Ratchet with Different Tooth Amount)
Axel: 100/142mm thru-axle
Freehub: Shimano  HG 11-speed installed (Campagnolo N3W and Sram XDR Freehubs are available separately)
Compatible with Clincher & Tubless tyres (hooked rim)
Compatible tyre width: Compatible with 25c Tyre and Above, Suggested Tyre Width is 28c - 32c