This 29-inch full carbon fiber off-road rim features a 30mm external width and 22mm height hookless structure, compatible with 1.9-2.35 inch tires. With a lightweight design of 255-360g, it balances XC racing efficiency and Enduro durability. Asymmetric spoke holes balance disc brake tension, and it supports tubeless systems. Custom options include carbon fiber patterns and paint finishes. Crafted by a factory with 10 years of experience, it’s a reliable choice for advanced riders.

Product Features and Advantages

Full Carbon Fiber Material:

Crafted from high-quality full carbon fiber, this rim leverages the material's low density and high strength to precisely control its weight between 255-360g. Compared to traditional aluminum rims, it reduces weight by approximately 30%, significantly lowering inertial resistance during rides and enhancing acceleration and climbing efficiency. Meanwhile, carbon fiber's excellent impact resistance and fatigue performance enable it to withstand frequent bumps, gravel impacts, and drop shocks in off-road scenarios, providing reliable support on rough terrain.

Eccentric Spoke Hole Design:

The unique offset (asymmetric) spoke hole design addresses the uneven force distribution on both sides of the disc brake system. By optimizing spoke angles and tension distribution, it balances stress differences between the drive side and non-drive side, reducing the risk of rim deformation under high-intensity braking or complex terrain. This design increases the overall rigidity of the wheel set by over 15%, ensuring more precise cornering response and stable performance when passing through rocky sections at high speeds, thus extending the rim's service life.

Customized for Off-Road Scenarios:

As a dedicated off-road mountain bike rim, its 29-inch diameter, paired with a 30mm external width and 22mm height hookless structure, perfectly fits 1.9-2.35 inch off-road tires. The wide rim design enhances tire sidewall support, allowing low-pressure riding to improve grip, easily handling complex terrains such as mud, gravel, and steep slopes. The straight-side structure is compatible with tubeless systems, reducing the risk of flat tires and further strengthening reliability in off-road environments, making it an ideal choice for XC racing, Enduro events, and trail riding.

Hookless Design for Tubeless Tires:

The hookless design is highly compatible with tubeless tires (tubeless systems), providing uniform and tight wrapping force for the tire bead to ensure sealing under low pressure. This effectively reduces the risk of ride interruptions caused by punctures or blowouts during off-road adventures. Additionally, the combination of tubeless tires and hookless rims minimizes rolling resistance, making rides smoother, especially suitable for long-duration, high-intensity wild off-road scenarios.

Factory-Provided Customization：

The factory offers a variety of customization services based on user requirements, including carbon fiber appearance patterns , exclusive paint colors and designs, and even adjustments to details like the number of spoke holes according to specific riding needs. From visual style to functional details, it fully caters to users' personalized preferences, making the hookless rim not only a performance tool but also a reflection of unique riding styles.

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

Carbon Fiber Core Construction:

The rim body is integrally molded using high-modulus carbon fiber layers, with a multi-directional woven structure (combining UD and 3K carbon fabrics) to optimize strength distribution. The carbon fiber matrix is reinforced with high-temperature resin, ensuring dimensional stability under extreme temperature changes (from -10℃ to 180℃) during off-road braking and riding.

Outer Dimensions:

29-inch diameter  with a 30mm external width and 22mm height, featuring a hookless (straight-side) profile. This low-profile design reduces air resistance while providing sufficient tire sidewall support.

Inner Structure: The inner width (bead-to-bead) is optimized to 25mm, specifically calibrated for 1.9-2.35 inch tires, ensuring proper tire expansion and stable seating under low pressure (20-25psi).

Asymmetric Spoke Hole Configuration

The rim features 24-36 offset spoke holes (configurable based on customization), arranged in an asymmetric pattern. The drive-side holes are offset by 3.5-6mm relative to the non-drive side, aligning with the tension requirements of disc brake systems. Each spoke hole is reinforced with a carbon fiber bushing (inserted during molding) to prevent stress concentration and reduce wear from spoke nipples.

Hookless Bead Design:

The bead seat adopts a hookless structure with a smooth, rounded edge (radius 1.5mm) to enhance tubeless compatibility. The bead retention is achieved through precise dimensional control (tolerance ±0.1mm) and surface texture treatment, ensuring airtightness with tubeless tires without relying on traditional hooks.

Surface & Finishing：

The outer surface is coated with a UV-resistant clear coat (thickness 5-8μm) to protect the carbon fiber weave from UV damage and scratches. Custom paint or decal layers can be applied on top of the clear coat, with a total finishing thickness not exceeding 10μm to avoid adding unnecessary weight.

Application Areas

Application areas for the XC-MA22X30HL-29ER carbon bicycle rim:

• XC (Cross-Country) Off-Road Races:

With its lightweight carbon fiber structure (255-360g) featuring a UD carbon cloth-dominated lamination design, it significantly reduces wheel inertia, helping riders maintain efficient output during climbing and acceleration phases. The 29-inch diameter paired with a 30mm external width offers both passability and flexibility on hard-packed dirt roads, gravel paths, and other race tracks. The 22mm low-profile hookless design reduces wind resistance and is compatible with 1.9-2.2 inch lightweight racing tires, perfectly meeting the extreme pursuit of speed and lightness in XC events.

• Daily Training for Advanced Riders:

 The design that balances lightness and durability is suitable for riders practicing skills on mixed terrains (including mountain roads around cities and suburban gravel paths). Customizable paint finishes and patterns (such as 3K carbon fiber appearance) meet personalized display needs. Meanwhile, the 25mm inner width’s compatibility with different tire widths allows riders to quickly change tires according to training content (from low-rolling-resistance racing tires to high-grip off-road tires).

Technical Parameters

Customized Weaves & Finishes:

Customized Holes:

Weight Check:

Clean burrs ＆ residues:

Rim Diameters Check:

Cleaning：

Packing：

XC-MA22X30HL-29ER Product Show