This carbon fiber mountain bike rim is engineered for off-road excellence, boasting a perfect blend of performance and durability. With a 25mm height and 35mm outer width, it provides robust support for 2.1-2.6 inch tires, ensuring superior grip and stability on rough terrains. The offset spoke hole design optimizes spoke tension distribution, enhancing lateral stiffness to handle intense turns and impacts, while the straight sidewall design ensures secure tire retention even at low pressures, simplifying maintenance during outdoor adventures. Crafted from high-grade carbon fiber, it achieves an ideal balance of lightweight performance and ruggedness, making it a top choice for mountain biking enthusiasts tackling trails, enduro, or downhill challenges.

What sets this rim apart is our factory’s commitment to personalized customization. We offer a range of tailored options to match your unique preferences: choose from various carbon fiber weave patterns to showcase a distinctive aesthetic; select custom paint finishes in your preferred colors to make your bike stand out; and opt for specific spoke hole counts to align with your build requirements. Whether you’re seeking a sleek, understated look or a bold, eye-catching design, we can bring your vision to life, ensuring your mountain bike rim is as unique as your riding style.

Product Features and Advantages

Premium Carbon Fiber Build:

Constructed from high-grade carbon fiber, the rim delivers an unbeatable combination of lightness and strength. It significantly reduces overall bike weight for improved maneuverability while withstanding the harsh impacts of off-road trails, rocks, and steep descents.

Offset Spoke Holes:

Ensures balanced spoke tension across the rim, boosting lateral stiffness to resist deformation during sharp turns, hard braking, or heavy collisions—critical for maintaining control in extreme conditions.

25mm Height & 35mm Width:

The 35mm outer width provides exceptional support for 2.1-2.6 inch tires, increasing ground contact area to enhance grip on loose or uneven terrain. The 25mm height strikes a perfect balance between aerodynamic efficiency and structural robustness.

Straight Sidewall:

Guarantees secure tire retention even at low pressures (common in off-roading), minimizing the risk of blowouts. It also simplifies tire installation and maintenance, a practical advantage for backcountry rides.

Off-Road Specialization：

 Engineered specifically for mountain biking, including trail riding, enduro, and downhill challenges. Every feature—from material to dimensions—works in harmony to deliver reliability and performance in rugged, unpredictable landscapes.

Tailored Customization:

The factory offers extensive personalization options to match individual needs:

Choose from diverse carbon fiber weave patterns for a unique visual appeal.

Select custom paint finishes in preferred colors to make the rim stand out.

Opt for specific spoke hole counts to align with unique build requirements.

This level of customization ensures the rim not only performs well but also reflects the rider’s personal style.

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

Offset Spoke Hole Configuration:

A key design highlight, the offset spoke holes are strategically positioned to balance tension across both sides of the rim. This reduces uneven stress during high-intensity maneuvers—such as sharp turns, sudden braking, or impacts with rocks—greatly enhancing lateral stiffness. The result is a more stable wheel that resists warping, ensuring consistent performance even in the most demanding trail conditions.

25mm Height & 35mm Outer Width Profile:

The 25mm rim height strikes a deliberate balance: it provides sufficient structural rigidity to handle heavy loads and impacts while avoiding unnecessary weight that could hinder agility. Complementing this, the 35mm outer width is optimized for 2.1-2.6 inch tires, creating a wider contact patch with the ground. This not only boosts grip on loose or uneven terrain but also enhances the tire’s ability to absorb shocks, improving ride comfort without sacrificing control.

Straight Sidewall Design:

Departing from curved alternatives, the straight sidewalls offer two critical benefits. First, they create a secure, uniform interface with the tire bead, ensuring reliable retention even when running low tire pressures—a common practice in off-roading to improve traction. Second, the simplified, linear structure simplifies tire installation and removal, a practical advantage for quick repairs or adjustments during backcountry rides.

Application Areas

Application areas for the XC-MA25X35HL-29ER carbon bicycle rim:

• Off-Road Adventures:

Its offset spoke hole configuration shines here, as it balances tension to resist warping during high-impact encounters with rocks, roots, or uneven terrain. The 35mm outer width, paired with 2.1-2.6 inch tires, creates a broad contact patch that enhances grip on loose dirt, mud, or gravel—critical for maintaining control when navigating steep descents or technical sections. The straight sidewalls add security by preventing tire slippage even at low pressures, a must for tackling unpredictable off-road trails.

• Mountain Terrain Riding:

Whether climbing rugged slopes or descending sharp inclines, the rim’s 25mm height strikes the perfect balance between rigidity and lightness. It withstands the torque of uphill efforts without adding excess weight, while the lateral stiffness from the offset spoke holes ensures stability during tight turns on mountain switchbacks. The durable carbon fiber construction holds up to repeated impacts from rocky paths, making it a reliable companion for mountain explorations.

• Daily Training Sessions: 

For regular rides on mixed surfaces—from paved roads to light trails—the rim’s lightweight design reduces fatigue during long training hours, allowing riders to focus on endurance and technique. The straight sidewalls simplify tire maintenance, making quick checks or pressure adjustments easy before daily outings. Additionally, its robust build handles consistent use, ensuring longevity even with frequent training rides, while the optimized width keeps rolling resistance balanced for efficient, comfortable sessions.

Technical Parameters

Customized Weaves & Finishes:

Customized Holes:

Weight Check:

Clean burrs ＆ residues:

Rim Diameters Check:

Cleaning:

Packing:

XC-MA25X35HL-29ER Product Show