This carbon fiber mountain bike rim is specially designed for enduro and all-mountain riding, with high performance and customized experience as its core highlights. Made from high-quality carbon fiber, it combines lightweight and high-strength properties, which can reduce the burden of the whole bike while calmly withstanding the impact of complex terrains and the pressure of continuous high-intensity riding.

The rim features a straight-side design with 40mm outer width and 30mm height. It not only fits a variety of tires ranging from 2.25 to 3.1 inches, enhancing grip and stability, but also strengthens structural rigidity and reduces the risk of skidding during riding. In addition, it supports personalized customization of spoke hole quantity and carbon fiber appearance painting, which can optimize performance and highlight personality according to riders' needs. It is an ideal choice for professional riders in enduro and all-mountain scenarios.

Product Features and Advantages

Superior Material with Balanced Performance:

Made of high-quality carbon fiber, it achieves the dual advantages of "lightweight + high strength": lighter than metal rims, reducing riding burden and improving acceleration and climbing efficiency; at the same time, it has excellent impact resistance and rigidity, able to withstand impacts from complex all-mountain terrains and continuous high-intensity loads in enduro races, with outstanding durability.

Structural Design with Strong Adaptability:

The 40mm outer width + 30mm height combination perfectly fits tires ranging from 2.25 to 3.1 inches. Whether narrow tires for speed or wide tires for enhanced grip, it provides stable support, increasing tire contact area and cornering stability.

The straight-side design strengthens overall rigidity, reduces the risk of tire skidding, and optimizes aerodynamic performance to reduce wind resistance, making riding smoother.

All-Scenario Versatility:

Designed specifically for enduro and all-mountain scenarios: in enduro races, its lightweight property reduces fatigue during long rides, and carbon fiber's shock absorption enhances comfort; in all-mountain riding, its high rigidity and impact resistance easily handle complex terrains such as steep slopes and gravel, ensuring riding safety and stability.

Personalized Customization for Practicality and Aesthetics:

Customizable spoke hole count allows adjustment of force distribution according to riders' weight and riding style to optimize performance matching; it also offers carbon fiber's natural finish and personalized painting options, retaining high-end texture while matching the overall bike style to highlight unique personality.

Strict Quality Control:

KOBIKE do 100% tire pressure(150 PSI), flatness(＜0.2mm) and roundness(＜0.2mm) inspections before shipping, also offering 2 years warranty for our carbon rims.

Product Structure

Core Material & Molding Process:

The rim body is constructed by laminating multiple carbon fiber plies, formed via a high-temperature, high-pressure one-piece molding process. Carbon fiber layers are strategically oriented along stress paths (e.g., radial and circumferential interlacing), ensuring overall rigidity while optimizing impact dispersion during riding—such as forces from rolling over gravel or landing on steep terrain—thus preventing fractures caused by localized stress concentration.

Contour Structure:

Hookless Design: Both sides of the rim feature a hookless profile without bead hooks, creating a smooth, vertical sidewall that enhances tire retention and seal integrity. This design minimizes the risk of "bead slip" under high pressure or intense vibrations while improving lateral stiffness for better cornering resistance.

Dimensional Specifications: The 40mm outer width provides ample support for tires ranging from 2.25 to 3.1 inches, ensuring a rounded tire profile after inflation and a more uniform ground contact area. The 30mm height strikes a balance between lightweight properties and longitudinal rigidity, catering to both climbing efficiency and high-speed stability.

Functional Details:

Spoke Hole Zone: A customizable number of spoke holes are pre-configured (adjustable as required, e.g., 28/32/36 holes). Hole edges are reinforced—via localized carbon fiber thickening or embedded metal inserts—to prevent stress-related damage when spokes are tensioned, ensuring uniform tension across the entire wheel.

Inner Wall & Edge Finish: The inner wall is smooth to reduce friction with inner tubes. Edges (where contact with tire beads occurs) are rounded and polished to protect tire beads while facilitating easy installation and removal.

Surface Layer Construction：

The outer layer consists of a transparent protective coating (preserving the carbon fiber weave pattern). Customization options include personalized paint finishes (e.g., matte/glossy coatings, printed graphics), which are thin and lightweight to avoid impacting the rim’s overall weight or performance.

Application Areas

Application areas for the AM-30X40HL-29ER carbon bicycle rim:

• Enduro Races:

Long-distance and lightweight requirements: In enduro races, which usually cover long distances, riders need to maintain efficient riding for an extended period. The carbon fiber material of the rim achieves lightweight, effectively reducing the overall weight of the bike, lowering the rider's physical exertion. This allows riders to more easily maintain speed and rhythm during long-distance rides, reduce fatigue, and improve race results.

Stability guarantee: The rim's hookless design, wide body (40mm outer width), appropriate height (30mm), and high-strength carbon fiber structure provide excellent stability and rigidity. During high-speed riding, it can effectively resist the impact of crosswinds and maintain the straight-line stability of the vehicle. When cornering, the enhanced lateral stiffness prevents the rim from deforming easily, enabling riders to corner at higher speeds with more confidence and reduce time loss.

Shock absorption and comfort: Carbon fiber material has certain shock absorption properties, which can filter out minor vibrations on the road, reduce the bumpy impact on riders during long rides, improve riding comfort, and help riders maintain a good state in the later stages of the race.

• All-Mountain Riding:

Adaptability to complex terrains: All-mountain riding involves various complex terrains such as steep slopes, rocky sections, and muddy trails. The wide-body design of the rim can accommodate wide tires ranging from 2.25 to 3.1 inches, increasing the contact area between the tire and the ground, providing better grip. This makes the vehicle less likely to slip on soft or slippery ground and provides stronger traction when climbing.

Impact resistance and durability: In the face of impacts from obstacles such as rocks and tree roots, the rim is made of carbon fiber through a high-temperature and high-pressure one-piece molding process, which has good impact toughness and can withstand large impacts without being easily damaged. At the same time, the hookless design reduces the weak points on the edge of the rim, further enhancing the overall durability, reducing the risk of rim deformation or damage under complex road conditions, and ensuring riding safety.

Controllability and flexibility: The structural design of the rim ensures good rigidity and lightweight, making the vehicle more flexible to control during all-mountain riding. Riders can more easily cope with sudden turns, jumps, and other actions, quickly adapt to different terrain changes, and enhance riding experience and fun.

• Daily Mountain Bike Training: 

Performance improvement for training effects: For daily training of mountain bike enthusiasts, the high-performance characteristics of this rim help riders improve their riding ability. The lightweight and good rigidity allow riders to focus more on improving skills and physical fitness during training, such as faster acceleration and more stable cornering, thereby improving training effects.

Durability for cost saving: In frequent daily training, the durability of the rim is particularly important. The high-quality carbon fiber material and solid structural design of this rim can withstand the test of long-term and high-frequency use, reduce the frequency of rim replacement due to damage, and save the rider's training costs.

Technical Parameters

Customized Weaves & Finishes:

Customized Holes:

Weight Check:

Clean burrs ＆ residues:

Rim Diameters Check:

Cleaning:

Packing:

AM-30X40HL-29ER Product Show