EXAR Pro series rims are made of HI-MOD carbon fiber. While keeping the rim, spoke and hub stiff, we optimized materials and structure to reduce overall weight. The light design effectively reduces driving weight and improves sprinting performance. 

Automatic carbon fiber winding technology is applied, and the carbon fiber is pre-stressed and is more straight and evenly forced. Thus, the stiffness and consistency of the wheelset are ensured.

Integral Design - No Sub-Assemblies
Instead of being a combination of components and sub-assemblies, EXAR carbon fiber wheelsets are quality and high-performing products featuring and integral design of appearance, weight, and performance.

Flat Engagement Ratchet Ensures Stable Performance
Adopts 36-tooth flat ratchet, which has tighter engagement with larger surface. This can make the ratchet more durable, with fast and precise engagement as well as stability. The rotating sound is more even with flat wire spring. 

Wider for Better Aerodynamics
Pro series wheelsets have an external width of 27mm and an internal width of 20mm.  The 27mm wide rim provides a flatter aerodynamic surface with 25c and 28c outer tires and thus reducing air resistance. 

Braking Rim Line Design
The unique grooved line of the rim brake wheelsets quickly drains water and improves braking performance.  The braking rim is made of temperature-resistant resin made to withstand up to 240 degrees C.

UCI Approved
EXAR Pro series wheelsets have passed UCI impact tests. After applying an energy of 40 J on the bare carbon rim, the deviation complies with UCI standard.


Unique Design of Rim
To improve the wheelset stability, stiffness and crosswind resistance of different frame heights, targeted wheel rim designs were made.  For disc brake wheels, the symmetric structure is adopted and the flange width is optimized so that the spoke tension on both sides are close to the same.  The cross-sections of Pro series wheelsets are redesigned for greater stability and rigidity.


Elaborate Hub Structure
The rear-wheel hub WR size is increased to ensure the spoke tension on the driving side is consistent with that on the non-driving side, hence to deliver outstanding lateral stiffness.  Adopting FEA technology and conducting several tests to identify the maximum force on the hub, to get a light and sturdy hub.

To obtain a better balance lateral stiffness, driving stiffness and braking effect, the front and rear spokes of the disc brake variants have applied a 2:1 balanced lacing pattern, and the hub geometry  has been adjusted accordingly. 

The rear-wheel drive side flange diameter is increased and the spoke direction is aligned with the torque direction and the wheelset driving efficiency is improved.

Balanced Design of Spoke Tension
For the rear wheel of the rim brake variant, and both front and rear wheels of the the disc brake variant, the 2:1 balanced lacing pattern is applied to reasonably distribute spoke tension and enhance the pedaling force. 

With a standard design of highly stiff spokes, the spoke tension of all models of rear-wheel drive side is 120kgf ±10%, with vigorous and powerful treading.

Where endurance meets performance, GR45 Pro is born for riding. Combining lightweight performance with all-terrain durability. The balanced profile, rim width & gravel optimised hubs ensure explosive power transfer on any surface and transform rough roads into smooth sailing.

More Powerful Design
The Pro series feature Pillar Wing21 flat spokes for excellent performance of aerodynamics and driving stiffness.  The self-locking spoke nipple for both internal and external use is applied, where the nipple is tighter and the spokes are not easy to loose. 

- SPECIFICATIONS - 

• Brake type - Disc Brake
• Frame Height - 45mm
• Weight - 1410g
• External width - 27mm
• Internal width - 20mm
• Rim Material - HI-MOD carbon fiber
• Brake - Center lock disc brake
• Spoke Type - Pillar Wing21
• Ratchet - 36T (Compatible with DT system. Replaceable with different tooth amount DT ratchet)
• Front Wheel Spoke Tension - 100kgf±10%
• Rear Wheel Spoke Tension - Drive side 120kgf±10% Non-drive side 110kgf±10%
• Front Wheel Spoke Lacing - DB45 Pro: 21H, 2:1, brake side×2, non-brake side radial lacing
• Rear Wheel Spoke Lacing - DB45 Pro: 24H, 2:1, drive side×2, brake side×2
• Rim Type - Front + Rear wheel: Symmetric
• Frame Spacing - 100/142mm thru-axle (100/135mm quick release available separately)
• Freehub - Standard SHIMANO 11-speed (Campagnolo N3W and Sram XDR freehubs are available separately)
• Compatible Cassette - Shimano 8-12s, Sram 8-12s (require separate XDR freehub for 12s), Campagnolo 8-13s (require separate N3W freehub)
• Compatible Tire Type - Clincher tire, tubeless tire
• Compatible Tire Width - Compatible with 25c tire and above [Suggested tire width is 28c-32c]
• Maximum Tire Pressure -
  • Clincher - 120psi for 25c, 110psi for 28c, 100 psi for 30c, 90psi for 32c
  • Tubeless - 110psi for 25c, 100psi for 28c, 90psi for 30c, 80psi for 32c

- INCLUDES -

• Carbon fiber front wheel *1
• Carbon fiber rear wheel *1
• Tubeless rim tape *2 (factory-installed)
• Instruction manual
• Tubeless valve *2