EXAR Carbon Fiber Ultra Wheelset

The EXAR Ultra carbon wheelset is made from HI-MOD carbon, based on an integrated, system-level design approach. Thanks to premium materials, weight is significantly reduced while the wheelset provides excellent stiffness. The result is easier starts and faster, more effortless acceleration.

• The wheelset weight shown in the table excludes the quick-release axle and rim tape. A ±3% weight deviation is possible; the actual wheelset weight always prevails.

The wheelset combines a lower front wheel with a higher rear wheel. The rear wheel provides high inertia, while the front wheel offers excellent handling. This lets you ride efficiently and stably.

• DB405 Ultra – the ideal choice for climbing
• DB508 Ultra – a balanced choice for climbs and flats
• DB607 Ultra – the ideal choice for fast riding on the flat

The EXAR Ultra carbon wheelset uses VONOA HI-MOD carbon spokes. A single spoke weighs just 2.8 g while providing excellent stiffness. Compared with top-end steel spokes, the Ultra spokes are 30% lighter and can withstand 30% more tensile force. With less power loss, power transfer is more efficient, giving greater drive efficiency.

Thanks to the latest patented design, the spokes' metal parts are hidden, while the spokes themselves are wider and thinner. This results in lower drag and a cleaner look.

The wheelset uses balanced 2:1 spoke lacing that distributes spoke tension evenly and optimally.

The EXAR Pro series uses a 36-tooth flat-tooth ratchet system that provides greater power transfer thanks to its larger contact surface. This design increases ratchet durability while enabling fast, precise engagement and greater stability. Thanks to the flat wire spring, the freewheel sound is smoother and more pleasant.

The ratchet system's design also allows easy replacement with ratchets of different tooth counts, offering greater flexibility and customisation.

The DB405 and DB508 have an outer rim width of 30 mm, while the DB607 front wheel is 32 mm wide and the rear wheel 30 mm.

Every wheel has an inner width of 23 mm. This provides optimal aerodynamic performance in changing wind conditions while improving stability in crosswinds.

After fitting 28–32C tyres, the junction between tyre and rim becomes flatter. This creates a more aerodynamic, flatter surface while also improving riding comfort.

*Wheelset rim width is measured at the widest point of the wheel.

• Larger flange hole diameter

The flange hole diameter has been scientifically optimised to match the stiffness of the carbon spokes. This reduces stress concentration where the spoke meets the hub, increasing drive stiffness and extending the system's lifespan.

• Smooth bearing seat

The contact surface between the bearing and the hub body has smooth, rounded edges for an exact, precise fit.

• Optimal WR dimension

The rear hub's WR dimension is 18.2 mm. This ensures that drive-side and non-drive-side spoke tension is almost equal, providing excellent lateral stiffness.

Compared with steel, ceramic is a lighter, lower-friction material, allowing smoother-running bearings. A well-designed ceramic bearing offers less resistance, saving energy and enabling faster acceleration.

EXAR Ultra wheelsets meet UCI impact resistance tests. After a 40 J impact on the bare carbon rim, rim deformation stays within the limit set by the UCI standard.

The wheelset is compatible with both tubeless and clincher tyres. The package includes tubeless rim tape and rim plugs. When using clincher tyres, the rim plugs help further reduce wheelset weight.

Dynamic balancing has been specifically optimised for use with TPU inner tubes. This ensures stable, balanced riding even at high speed.