Carbon Mountain Bike Rims 29 Inch 27.5 Inch Eccentric Design 37mm Outer Width 30mm Inner Width 28 Holes 32 Holes

Carbon mountain bike rims 29 specifications

These carbon mountain bike rims 29 are built for XC off-road cycling with a lightweight structure, an eccentric design, and a wide profile that supports larger tire widths.

• Brand Name: DXBORA
• High-concerned chemical: None
• Material: Carbon Fibre
• Model Number: M30
• Origin: Mainland China
• Use: Mountain Bikes

27.5 inch rims and 29 inch size options

• 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 is recommended at 25-50 PSI, and clincher tires are recommended at 30-60 PSI. Narrow tire compatibility is listed at 2.2–2.4 inch tires, with hard surfaces suited to 35-50 PSI and loose terrain suited to 30–45 PSI.

Eccentric design with 37mm outer width and 30mm inner width

The wide body design uses a 37mm outer width and 30mm inner width to support tire stability, cornering control, and a better balance between speed and comfort. The eccentric design is intended to improve drive-side tension balance, help address asymmetric wheel tension issues, extend spoke lifespan, and improve drive efficiency.

Material construction combines T800 60% + T700 40% high-modulus carbon fiber hybrid materials, with the carbon cloth layer optimized multiple times for rigidity and strength.

Hookless technology and ACL carbon layup

Hookless technology helps reduce weight and is compatible with tubeless tires when used with the correct rim strips and tire beads. The ACL (Arch Bridge Carbon Fiber Lamination) structure and dual carbon fiber layup are designed to balance lightweight performance with durability and a strong stiffness-to-weight ratio.

Recommended use cases and performance characteristics

• Competitive XC racing and training: lightweight construction and low rim height support climbing responsiveness.
• Technical off-road trails: 30 mm internal width supports 2.2–2.4 inch tires and helps improve grip and shock absorption.
• Long-distance endurance riding: carbon fiber vibration damping can help reduce fatigue on complex terrain.
• Lightweight: 368 grams helps reduce rotational inertia and improve acceleration response.
• High rigidity: T800 and T700 carbon fiber layers combined with the eccentric design increase torsional strength and reduce lateral deformation.
• Compatibility: the 30 mm internal width is designed to accommodate wide tires and support tubeless use.

Installation precautions

• Use carbon fiber-specific rim tape and a torque wrench when installing spokes, typically 5–6 Nm.
• Avoid overloading or extreme impacts, and inspect sidewall abrasions and spoke tension regularly.
• Use high-quality spokes and professional wheel-building techniques for best results.