This carbon fiber mountain bike rim is specially designed for enduro races and all-mountain terrains. With the perfect combination of 30mm height and 40mm external width, along with a straight-side structure, it not only boasts the lightweight property brought by carbon fiber material but also possesses super rigidity. It can easily withstand impacts in complex road conditions and the test of long-time riding, providing riders with stable control and a comfortable experience.

As a manufacturer with 10 years of production experience, we adhere to the factory direct sales model, eliminating intermediate links to benefit consumers, ensuring that you can obtain high-quality rims at a more favorable price. Meanwhile, we support personalized customization services, which can adjust details according to your specific needs, meet your unique requirements for rims, and add exclusive guarantees to your riding journey.

Product Features and Advantages

Specialized Design:

Tailored for enduro races and all-mountain terrains, featuring a 30mm height, 40mm external width, and a straight-side structure. This combination ensures optimal performance in various complex riding conditions, from rocky descents to steep climbs.

Premium Material:

Made of high-quality carbon fiber, offering the dual benefits of being lightweight and having super rigidity. It effectively reduces the overall weight of the bike while withstanding impacts from complex road conditions and standing the test of long-time riding.

Exceptional Performance:

Provides riders with stable control and a comfortable experience. The rigid structure minimizes sidewall flex during high-speed corners, while the material's natural vibration-damping properties reduce fatigue, making it reliable for both intense races and extended rides.

Wide Tire Compatibility:

The 40mm external width is designed to accommodate a range of tire sizes, typically from 2.3 inches to 3.0 inches. This allows riders to choose tires based on specific terrain and riding preferences, enhancing versatility.

Enhanced Durability：

The straight-side design, combined with the strength of carbon fiber, significantly improves the rim's resistance to deformation and damage. It can endure the continuous stress of long-distance rides and the harsh impacts of off-road trails.

Tubeless Ready：

Compatible with tubeless tire setups, which helps reduce the risk of punctures, improves traction, and allows for lower tire pressure to enhance comfort and control on rough terrain.

Personalized customization：

With 10 years of production experience, we excel in providing personalized customization services. You can customize the number of spoke holes, choose your preferred carbon fiber texture, and add personalized stickers, ensuring the product perfectly meets your unique needs and preferences.

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

Rim Body:

Constructed from high-quality carbon fiber through advanced molding processes, the rim body forms the core structure. Its 30mm height and 40mm external width are precisely engineered to balance rigidity, weight, and tire compatibility. The carbon fiber layers are arranged in a specific orientation to optimize strength and toughness, ensuring it can withstand the rigors of enduro races and all-mountain terrains.

Straight Sidewalls:

The straight-side design is a key structural feature. Unlike curved sidewalls, straight sidewalls provide a larger contact area with the tire, enhancing tire retention and stability. This design also contributes to the overall rigidity of the rim, reducing sidewall flex during high-speed cornering and heavy impacts, thus improving handling performance.

Spoke Hole Zone:

The area where spoke holes are located is reinforced to handle the tension from the spokes. With customizable spoke hole quantities, the design ensures even distribution of stress across the rim, preventing localized damage. The holes are precisely drilled to maintain the integrity of the carbon fiber structure, ensuring a secure connection between the rim and spokes.

Bead Seat Area：

This is the part of the rim that interfaces with the tire beads. It is designed to accommodate tubeless tire setups, featuring a tight seal to prevent air leakage. The bead seat area is also reinforced to withstand the pressure from the tire, ensuring a reliable fit even during rough rides.

Application Areas

Application areas for the EN-M30X40HL-27.5 carbon bicycle rim:

• Enduro Races:

The rim's robust carbon fiber construction, with its optimized 30mm height and 40mm external width, makes it ideal for enduro races. These races often involve long distances, varied terrains including steep climbs, technical descents, and rocky sections. The straight sidewalls and reinforced structure ensure it can handle the continuous impacts and high stress of such competitions, while the lightweight design helps riders conserve energy throughout the event.

• All-Mountain Riding:

For riders who enjoy exploring diverse all-mountain terrains, from forest singletracks to open mountain trails, this rim is a perfect fit. Its wide tire compatibility (2.3"-3.0") allows for adapting to different surfaces, whether it's muddy paths or dry, loose gravel. The tubeless-ready bead seat area enhances puncture resistance, ensuring a smooth ride even on rough and unpredictable trails.

• Extended Off-Road Adventures: 

When embarking on multi-day off-road adventures, reliability is crucial. The rim's enhanced durability, thanks to the straight sidewalls and reinforced spoke hole zone, ensures it can withstand the wear and tear of long hours on the bike. The vibration-damping properties of carbon fiber also contribute to rider comfort during extended periods in the saddle, reducing fatigue.

• Technical Trail Riding：

Technical trails with obstacles like roots, rocks, and tight switchbacks demand precise handling. The rigidity of the rim, combined with its stable structure, minimizes sidewall flex during sharp turns and sudden maneuvers, giving riders better control. This makes it suitable for riders seeking to tackle challenging technical sections with confidence.

Technical Parameters

Customized Weaves & Finishes:

Customized Holes:

Weight Check:

Clean burrs ＆ residues:

Rim Diameters Check:

Cleaning:

Packing:

EN-M30X40HL-27.5 Product Show