The KOIBIKE D40X30TL/HL-650B-UL utilizes Japan's Toray T700-T1100 high-modulus carbon fiber, combined with its proprietary vacuum forming process and stress-guided layup technology. This results in an exceptionally light weight of just 345±15g per lap, making it a leader in its class for 650B wheels. The 24mm internal width perfectly accommodates tires ranging from 28–50cm wide, supporting modern low-pressure riding strategies and significantly improving grip, comfort, and gravel handling.

TL (Tubeless-Ready) straight-side design: Tubeless-ready, reducing rolling resistance and puncture risk;

HL (Hooked-Lip) hooked-side design: Compatible with both tubeless and clincher tires, enhancing tire installation safety and brand compatibility.

The ETRTO standard bead seat design with an ERD of 521mm ensures precise compatibility with mainstream hub and spoke lengths, simplifying the wheelset building process. The UD matte surface is treated with multiple layers of weather-resistant coating for excellent scratch and UV resistance, maintaining an industrial look even after long-term use.

As a company with its own carbon fiber production base and full-chain manufacturing capabilities, KOIBIKE is not only a manufacturer but also a trusted OEM/ODM technical partner for premium global brands. 

Product Features and Advantages

Precise fit for 650B wheels: 

27.5-inch design and an ETRTO bead seat diameter matched to the 521mm ERD diameter ensure precise wheel assembly and smooth operation. 

Ultra-lightweight and agile: 

345 ± 15g ultra-lightweight, the 40mm rim depth provides agile handling for effortless acceleration and climbing.

Flexible tire adaptability: 

The straight rims are designed for tubeless tires with excellent sealing, while the hooked rims are compatible with both tubeless and clincher tires, meeting diverse needs.

Safe and reliable braking: 

Available with disc and rim brakes, they offer efficient heat dissipation and minimize thermal decay during continuous braking, ensuring safety.

Efficient customization: 

Our in-house factory supports customization of spoke hole counts and other features, quickly responding to individual B-end customer needs.

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

Compatible spoke holes and dimensions: 

Customizable in multiple hole counts, reinforced with carbon fiber and paired with a 521mm ERD, they provide a precise fit, disperse tension, and enhance rigidity.

Rim finish: 

UD matte paint finish with a distinct carbon fiber texture and a wear-resistant finish for scratch and sun resistance, offering both aesthetics and durability. 

Brake Track and Tire Compatibility: 

The 30mm widened brake track features a straight, smooth edge suitable for tubeless tires; the hooked track with snap-in grooves is compatible with both tubeless and clincher tires, ensuring smooth braking.

Rim and Aerodynamic Design: 

The 40mm deep rim with a 30mm outer width streamlined rim optimizes aerodynamics and reduces drag. The carbon layup is adjusted based on load, resulting in exceptional stiffness and lightness.

Application Areas

Application areas for the D40X30TL/HL-650B-ULcarbon bicycle rim:

650B Specification Road Cycling: 

Compatible with 27.5-inch road bikes, it offers exceptional lightness and flexibility, perfect for everyday riding and training.

Gravel Cycling: 

Wide tire compatibility and durable construction ensure stable riding on complex surfaces like gravel.

Cycling Equipment Trade: 

Factory direct supply, with strong compatibility in the 650B specification, making it suitable for traders to expand their market.

Original Vehicle Manufacturer Support: 

Precisely adapted for 27.5-inch models, customizable options are available, providing manufacturers with cost-effective wheel solutions.

Teams and clubs: 

Tire compatibility and precise adaptation meet the diverse needs of members and facilitate unified purchasing and management.

Technical Parameters

Customized Weaves & Finishes:

Customized Holes:

Weight Check:

Clean burrs ＆ residues

Rim Diameters Check:

Cleaning & Packing

D40X30TL/HL-650B-ULProduct Show