When mountain bike design shifts from "rigid stacking" to "dynamic adaptability." The KOIBIKE XC-M25X30HL-29ER-UL embodies this principle—it doesn't rely on a tall rim for added stiffness, nor does it blindly widen for stability. Instead, it achieves a new balance of impact absorption, traction control, and responsiveness through a balanced combination of width and mass.

The 30mm width maintains ideal sidewall tension for tires between 1.9-2.35 inches within a tire pressure range of 21–32 psi, minimizing carcass slippage and lag in corners and ensuring agile steering. The 25mm low profile minimizes unnecessary material, concentrating structural mass in the spoke anchorage area and tire bed core. This creates an efficient mass distribution with a "light periphery and strong anchor points," significantly reducing rotational inertia.

Product Features and Advantages

260g Ultra-Lightweight: 

Minimizes unsprung mass, improving wheel responsiveness on terrain like gravel and roots.

30mm External Width Pre-Tension Molding: 

Optimizes tire tension distribution, reduces cornering delay, and enhances handling predictability.

25mm Low Profile Efficient Structure: 

Shortens moment arms, enhances lateral stiffness, and reduces pedaling energy loss.

Wide Tire Pressure Range (21–32 psi): 

Adapts to modern low-pressure riding strategies, improving grip and ride comfort.

1.9–2.35-inch Wide Compatibility: 

Covers a wide range of tires, from XC racing to light trail riding, enhancing system flexibility.

UD Matte Protective Coating: 

Scratch- and UV-resistant, designed to withstand heavy use and diverse climates.

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

Mass Distribution Strategy: 

Utilizing a "center-strengthening, edge-reducing" design strategy, the spoke hole area features multiple layers of reinforcement, while the rim top is thinned, resulting in an exceptionally light weight of 260g.

External Width Functional Definition: 

30mm external width, verified by FEA simulation, ensures uniform stress on the bead under dynamic loads, preventing localized delamination.

Vacuum Seal Interface: 

Integrated molded bead seat, compatible with sealant or sealant, provides high-reliability vacuum system support.

Spoke System Compatibility: 

Supports 28H/32H operation, with a cross-triple braiding method recommended. Carbon fiber-reinforced eyelets enhance long-term tension retention.

Material Engineering: 

High-modulus Toray carbon cloth, vacuum-bagging and high-temperature curing ensures uniform resin distribution and structural density.

Surface Treatment: 

UD matte coating preserves the original carbon fiber texture, with a weather-resistant protective film applied to the exterior for extended service life.

Application Areas

Application areas for the D30X28TL carbon bicycle rim:

Terrain Following Enhanced System: 

On high-speed trails and technical sections, low unsprung mass enables the wheel to respond more quickly to undulations, reducing bouncing and improving traction consistency.

Structural Support for Modern Wide Tire Strategies: 

Providing an ideal platform for medium-width tires ranging from 1.9-2.35 inches, unleashing the grip and comfort benefits of low tire pressure.

Lightweight Vehicle Development Benchmark: 

Suitable for high-end XC/Trail brands pursuing the utmost in quality control, supporting both OEM and custom development.

Entry Point for Business-to-Business Technical Cooperation: 

KOIBIKE offers full-process ODM services, from structural prototyping and material selection to mass production, helping brands quickly launch high-performance products.

Technical Parameters

Customized Weaves & Finishes:

Customized Holes:

Weight Check:

Clean burrs ＆ residues

Rim Diameters Check:

Cleaning

Packing

XC-M25X30HL-29ER-UL Product Show