KOI BIKE：R50X26T is a 50mm deep, 26mm internal width carbon tubular rim designed for performance and versatility. Made from high-modulus Toray T700/T800 carbon, it weighs just ~375g (±15g) per rim—lightweight yet strong for fast acceleration and climbing. Aerodynamic profile enhances speed and efficiency. Supports 23C–42C tires with 120–130 psi pressure range, ideal for road and endurance riding. Available with symmetrical or offset spoke drilling for optimized tension and durability. Recommended for riders 55–95kg.

KOI BIKE – A trusted manufacturer with 10 years of expertise as a direct factory, specializing in high-performance carbon wheels for global cyclists.

Product Features and Advantages

• High-Modulus Carbon Fiber (T800/T1000)
  Constructed from high-modulus Toray T700/T800/T1000 prepreg carbon fiber, ensuring exceptional strength, stiffness, and durability while maintaining a lightweight profile.

• Offset Spoke Hole Design
  Features offset-spoked compatibility, allowing for optimized spoke angles and lacing patterns to improve force transmission and wheel stability.

• Lightweight Construction
  Weighs only 375 ± 15g, offering a perfect balance of lightness and rigidity for enhanced acceleration and climbing performance.

• Wide Tire Compatibility
  With an internal width of 25mm, it supports 23–42C tires, providing excellent grip, comfort, and versatility across various riding conditions.

• High Roundness and Flatness
  Achieves precise roundness (±0.2mm) and flatness (±0.15mm) for smooth rotation and consistent performance.

• Customizable Options
  Available in multiple textures (UD, Marble, 12K, Twill) and spoke hole configurations (e.g., 16/18/20/24H), offering flexibility and personalization.

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

Material Selection

      Aerospace-Grade Composite: Utilizes Toray  T700/T800/T1000 high-modulus carbon fiber, delivering exceptional strength-to-weight ratios for optimal stiffness and minimal weight.

Tubular-Specific Rim Design

Contoured Base Profile：Precision groove design ensures secure tubular adhesion for cornering at 60+ km/h
3K-Textured Bonding Zone：Enhanced glue adhesion with aerospace-derived surface treatment

Aerodynamic Performance

• 50mm Deep-Section Profile: Wind-tunnel-validated to reduce drag by 12% at 40+ km/h.

• 26mm External Width: Streamlined shape maintains stability in crosswinds while improving airflow transition.

Application Areas

Road Races

Suitable for flat stages, breakaways, and sprint finishes. A 50mm rim depth helps reduce drag, while a 26mm outer width improves crosswind stability (especially suitable for open courses like those in the Netherlands and Belgium).

Time Trial/Triathlon

A 50mm-deep rim combined with a wide tire design (such as a 26mm outer width) reduces front wheel turbulence (especially effective with closed-wheel tires). Low-rolling resistance tubular tires provide improved grip and stability.

Cobbled Classics

Use latex tubular tires for improved cushioning. Tire pressure is reduced to 85-90 psi (using the tubular's natural deformation to absorb shock). Tubular tires are directly bonded to avoid "snake bite" punctures (compared to tubeless tires' disadvantages on cobblestone roads).

Velodrome

Beadless design reduces moment of inertia (for more direct acceleration). Compatible with 23mm ultra-high-pressure tubular tires (150 psi+).

Pro Training

Team mechanics can quickly replace pre-bonded tubular wheels. No risk of corrosion from tubeless tire refills (more reliable for long-term storage).

Technical Parameters

Customized Weaves & Finishes:

Customized Laser Engraving Brake Track:

Customized Holes:

Weight Check:

Clean burrs ＆ residues

Rim Diameters Check:

Cleaning & Packing

R50X26T-UL Product Show