KOIBIKE Factory Trading Company, leveraging its extensive experience in rim manufacturing, meticulously crafts the XC-M20X36HL-29ER cross-country mountain bike rims in its state-of-the-art factory. From R&D conception to finished product, we independently control the entire process. Our mature supply chain ensures efficient delivery of B-to-B customer orders. We also support customized services to meet diverse needs. The rims are crafted from premium carbon fiber, using a unique weaving and high-temperature molding process to create a stable and lightweight structure. The 20mm low profile ensures strength while enhancing maneuverability, making it easy to handle complex terrain. The 36mm width accommodates tires from 2.1 to 2.6 inches wide, providing enhanced grip on soft sand and muddy trails. The hookless design optimizes the fit between the rim and tire, reducing the risk of flats. The disc brake system, with a carefully tuned brake track, provides responsive and stable braking. The factory can customize the number of spoke holes and offer a wide range of colors. From production to after-sales support, our one-stop service helps bicycle brands, distributors, and other partners expand their market reach.

Product Features and Advantages

Extreme Lightweight Acceleration: 

At an ultra-light 285 ± 15 grams, it's up to 45% lighter than comparable aluminum alloy rims. This significantly reduces moment of inertia, allowing for rapid acceleration and breathless climbing, making it easy to surpass your limits and improving riding efficiency.

Wide Width for Strong Grip: 

The ultra-wide 36mm design increases tire contact area by approximately 30% when used with wider tires. This significantly enhances grip on complex mountain terrain, such as soft sand and slippery mud, ensuring stable cornering and significantly reducing the risk of sideways slipping, ensuring a safer ride.

Hookless Construction Advantages: 

The hookless design reduces stress concentration at the rim edge, improving overall strength and durability. Optimized tire sealing performance makes it more suitable for tubeless tire installation, reducing the chance of flats and reducing maintenance hassles.

Efficient Disc Braking: 

The brake track, optimized for disc brake systems, is smooth and mates securely with the disc pads. Braking response is immediate, heat dissipation is excellent, and braking is stable even on long, continuous downhill descents, ensuring safe riding.

UD Paint Quality: 

Classic UD paint perfectly showcases the unique texture of carbon fiber. The paint finish is specially treated for wear and scratch resistance, resistant to frequent scrapes from sand and rocks in mountain environments, ensuring a pristine appearance over time.

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 Height and Application: 

The 20mm low-profile design prioritizes lateral stiffness and lightweight, making it suitable for XC and trail riding, where handling and efficiency are paramount rather than aerodynamics.

External Width and Hookless Construction: 

The extra-wide 36mm outer diameter and hookless design, molded in a one-piece process, eliminate stress concentration points found in traditional hooked rims, improving overall structural consistency and impact resistance.

Tubeless Compatibility:

Optimized for tubeless systems, the inner diameter meets ETRTO standards, ensuring a secure bead seal and supporting tire pressures as low as 18–30 psi, enhancing comfort and grip.

Spoke Hole Configuration: 

Standard 16H -36H spokes are available, supporting J-bend or straight-pull spokes. A cross-triple lacing (3X) is recommended to ensure even spoke tension distribution under high torque.

Rim Body and Stiffness: 

Utilizing a double-layer carbon fiber reinforcement layer, with a focus on strengthening the tire bed and spoke hole areas, lateral stiffness is increased by approximately 35% compared to similar-sized aluminum rims, reducing pedaling distortion. 

Braking System: 

Designed specifically for disc brakes, the brake rim is eliminated, reducing unnecessary weight and preventing carbon brake fade.

Exterior Finish: 

Standard UD matte paint delivers a stable and professional look, and can be upgraded to 12K high-gloss, twill, or custom paint finishes to meet brand differentiation needs.

Application Areas

Application areas for the XC-M20X36HL-29ER carbon bicycle rim:

Cross-Country Racing: 

The lightweight design significantly improves acceleration and climbing efficiency, making it an ideal choice for UCI events and endurance races.

Trail Riding: 

The wide-body construction enhances tire support, boosting confidence on challenging terrain like rocks, roots, and bends.

Gravel: 

Suitable for wide tires and low tire pressure, it delivers stable riding on unpaved surfaces such as gravel, dirt roads, and sandstone.

High-End Vehicle Accessories and Modification Market: 

Suitable for OEM or custom development by high-end domestic and international mountain bike brands, modification shops, and racing teams. OEM/ODM cooperation:

 KOIBIKE provides full-process support from design, proofing, testing to mass delivery to meet brand customers' demands for quality, delivery time and customization.

Technical Parameters

Customized Weaves & Finishes:

Customized Laser Engraving Brake Track:

Customized Holes:

Weight Check:

Clean burrs ＆ residues

Rim Diameters Check:

Cleaning

Packing

 XC-M20X36HL-29ER Product Show