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 Ultra wheelset applies HI-MOD T800 carbon fiber, 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.

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 tire, the contact surface between the tire and rim is flat. As a result, It creates a flatter aerodynamic surface and enhances cycling comfort.

Lower Front Wheel and Higher Rear Wheel Design

The EXAR Ultra 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.

EXAR Ultra carbon fiber wheelset features HI-MOD T800 carbon fiber spokes. Each spoke weighs only 2.8g, 30% lighter than top-level steel spokes. Carbon fiber 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%.

Ceramic Bearing, Smooth And Durable

Compared to steel, ceramic is lightweight with low resistance, which can be used to make smoother bearings. A well-made ceramic bearing has lower resistance, thus saving you energy and allowing rapid acceleration.
The contact surface of the bearing and body is processed with smooth edges to create precise synergy.

 

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.

Specifications

Model	DB405
Brake	Disc Brake
Height	Front Wheel 40mm, Rear Wheel 45mm
Weight	1290g ±3%
External Rim Width	30mm
Internal Rim Width	23mm
Rim Material	HI-MOD T800 Carbon Fiber Spoke: HI-MOD T800 Carbon Fiber
Front Wheel Spoke Tension	110kgf±10%
Rear Wheel Spoke Tension	Drive Side 130kgf±10%, Non-drive Side 110kgf±10%
Front Wheel Spoke Lacing	21H 2:1, Brake Side×2, Non-brake Side Radial Lacing
Rear Wheel Spoke Lacing	21H, 2:1, Drive Side×2, Brake Side Radial Lacing
Ratchet	36T (Compatible with DT Swiss System. Replaceable Ratchet with Different Tooth Amount)
Frame Spacing	100/142mm thru-axle
Freehub	Standard Shimano 11-speed (Campagnolo N3W and Sram XDR Freehubs are available separately)
Compatible Cassette	Shimano 8-12 Speed
Compatible Tire Type	Clincher Tire, Tubeless Tire
Maximum Tire Pressure	120psi for Clincher Tire, 110psi for Tubeless Tire
Compatible Tire Width	Compatible with 25c Tire and Above, Suggested Tire Width is 28c - 32c