This is carbon fiber mountain bike rim specially designed for XC (off-road cycling), featuring a lightweight structure (368 grams) and an eccentric rim design, balancing strength and handling. The wide body design with an outer width of 37mm and an inner width of 30mm is suitable for large tire widths. The low frame height of 25mm optimizes climbing and acceleration performance, making it ideal for agile riding in complex terrains. It is made and formed by combining T800 60%+T700 40% high-modulus carbon fiber hybrid materials with eccentric wheel design. The carbon cloth layer has been optimized multiple times, ensuring sufficient rigidity and strength.
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Product Specifications

• Size: 27.5/29-inch
• External Width: 37 mm
• Internal Width: 30 mm
• Width and Height: 25 mm
• Weight: 29/368 g (±18 g), 27.5/354 g (±18 g)
• ERD：29/592MM,27.5/554MM
• Surface Finish: Matte
• Spoke Holes: 28 holes, Outer Diameter 9.5 mm, Inner Diameter 4.5 mm
• Spoke Hole Angle: 8° / 6°
• Material: T800 / T700
• Maximum Tire Pressure: 60 PSI (Tubeless recommended 25-50 PSI, Clincher Tire recommended 30-60 PSI)
• Narrow Tires (2.2"–2.4")
• Hard Surfaces (XC Off-road / Road): 35-50 PSI
• Loose terrain (gravel/mud): 30–45 PSI
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Design Features

• T800 main layer: High strength and high modulus to improve lateral stiffness.
• T700 auxiliary layer: Enhances toughness, absorbs vibrations, optimizes riding comfort, and reduces hand fatigue on gravel roads.
• Lamination process: Combines two types of carbon fabric layers to balance lightweight properties and durability.
• Eccentric rim (enhancing drive-side tension balance) addresses asymmetric wheel tension issues, extends spoke lifespan, and improves drive efficiency.
• XC (Cross Country) Racing/Training
• An internal width of 30mm provides better tire support, preventing the “balloon effect” and improving cornering stability.
• An external width of 37mm enhances lateral stiffness, ideal for aggressive cornering and rough terrain.
Hookless Technology
• Eliminates the traditional tire hook to reduce weight and is compatible with tubeless tires, requiring dedicated rim strips and tire beads.
ACL(Arch Bridge Carbon Fiber Lamination)
The rim features an ACL (Arch Bridge Carbon Fiber Lamination) structure combined with a dual carbon fiber layup design, allowing each carbon fiber layer to perform optimally. This results in a rim that is both strong and lightweight, delivering an exceptional stiffness-to-weight ratio. The design is inspired by the classic mechanics of arch bridges.
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Recommended Use Cases

• Competitive XC Racing: Lightweight construction and low rim height enhance climbing responsiveness.
• Technical Off-road Trails: 30 mm internal width compatible with 2.2–2.4 inch tires, improving grip and shock absorption.
• Long-distance Endurance Riding: Carbon fiber shock absorption reduces fatigue, while the eccentric design ensures stability on complex terrain.
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Performance Characteristics

• Lightweight: At 368 grams, the rim significantly reduces rotational inertia, improving acceleration response.
• High Rigidity: T800 and T700 carbon fiber layers combined with an eccentric design increase torsional strength and reduce lateral deformation.
• Compatibility: 30 mm internal width accommodates wide tires, balancing speed and comfort, and is compatible with tubeless tires.

Precautions
• During installation, use carbon fiber-specific rim tape and a torque wrench to tighten spokes (typically 5–6 Nm).
• Avoid overloading or extreme impacts; regularly inspect sidewall abrasions and spoke tension.
• It is recommended to use high-quality spokes and professional wheel-building techniques to ensure optimal performance.