A high-performance carbon fiber bicycle rim, engineered with Japan’s Toray T800 carbon for an optimal blend of lightness and strength. Key specs include 40mm height, 30mm outer width, and 24mm inner width, balancing aerodynamics and versatility.

Available in two designs: hookless (ideal for tubeless tires, 28c-32c, 30-70psi) and hooked (compatible with high-pressure setups up to 120psi). Factory-direct pricing offers 30-50% savings vs. branded alternatives, with full customization (color, logo, spoke holes, hub compatibility) to suit diverse needs.

Precision-crafted for ±0.15mm roundness and fitted with scratch-resistant UV coating, it excels across road racing, gravel rides, and daily commuting.

Product Features and Advantages

Premium Toray Carbon Performance:

Made with Japan’s Toray T800 carbon fiber, achieving 30-40% weight reduction vs. aluminum rims while enhancing impact resistance by 20%. Delivers faster acceleration and nimble handling.

Dual-Edge Versatility:

Straight edge: Aerodynamic profile optimized for tubeless tires (28c-32c), supporting 30-70psi for lower rolling resistance and better puncture protection.

Hooked edge: Compatible with both clincher (inner tube) and tubeless setups, handling up to 120psi for high-pressure racing needs. Reinforced hooks ensure secure tire retention at speed.

Factory-Direct Value & Customization:

Bypasses middlemen for 30-50% cost savings vs. branded rims. Fully customizable: choose color, logo printing, spoke hole counts (24/28/32/36), and hub compatibility (Shimano/SRAM/XDR) for tailored solutions.

Precision Engineering:

CNC-machined molds ensure ±0.15mm roundness and uniform spoke tension. UV-resistant coating (matte/gloss) adds scratch resistance and long-term durability, even in harsh conditions.

All-Scenario Excellence：

40mm height + 30mm outer width balances aerodynamics (reduces wind resistance by ~8% at 40-60km/h) and stability, perfect for road racing, gravel rides, and daily commuting.

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

Core Material Layer:

Constructed with Japan Toray T800 carbon fiber prepreg, layered in a 0°/45°/90° orientation for balanced strength (tensile strength ≥5490MPa) and lightweight (30-40% lighter than aluminum).

Reinforced at stress points (spoke holes, bead seats) with extra carbon plies to resist impact and tension.

Edge Designs:

Straight edge:

No traditional bead hooks; features a smooth, aerodynamic sidewall.

Optimized bead seat width (24mm inner width) for tight tubeless tire fit (28c-32c), with airtight sealing grooves.

Hooked Edge:

Integral bead hooks (height: 2.5mm) to lock tires securely, supporting high pressure (up to 120psi).

Chamfered hook edges reduce tire friction during installation.

Spoke Hole Configuration:

Precision-drilled spoke holes with reinforced carbon bushings to distribute tension evenly.

Available in 24/28/32/36 holes, compatible with both round and bladed spokes.

Surface Layer：

0.1mm-thick UV-resistant clear coat (matte or gloss) for scratch resistance and weather durability.

Optional custom color layers for personalized aesthetics.

Dimensions：

Height: 40mm (aerodynamic profile).

Outer width: 30mm (reduces air turbulence); inner width: 24mm (supports wide tires for comfort).

This structure balances aerodynamics, strength, and versatility, suitable for diverse riding styles.

Application Areas

Application areas for the D40X30TL carbon bicycle rim:

• Road Cycling:

The 40mm aerodynamic profile reduces wind resistance by ~8% at 40-60km/h, ideal for high-speed sprints and time trials.

Lightweight Toray T800 carbon construction (30-40% lighter than aluminum) enhances acceleration and climbing efficiency.

• Gravel Riding:

 Hookless design supports tubeless tires (28c-50c) with lower pressure (24-48psi), improving traction on loose terrain and reducing punctures.

30mm outer width and 24mm inner width accommodate wider tires for shock absorption on rough roads.

• Daily Commuting: 

Durable UV-resistant coating withstands daily wear, rain, and UV exposure.

Versatile hooked edge option works with standard clincher tires (inner tube) for easy maintenance and cost-effectiveness.

• Recreational Cycling:

Customizable color/logo options cater to personal style preferences.

Balanced weight and stability ensure comfort for long-distance rides or casual weekend outings.

• Competitive Gravel Events:

Reinforced spoke holes and stress points handle the rigors of off-road impacts, while the dual-edge design adapts to varying tire setups (tubeless for mud, high-pressure clinchers for hardpack).

Technical Parameters

Customized Weaves & Finishes:

Customized Holes:

Weight Check:

Clean burrs ＆ residues:

Rim Diameters Check:

Cleaning：

Packing：

D40X30TL Product Show