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Carbon Rim Brake Track Types Explained: UD, Basalt, 3K, Twill & Grooved

2021-10-12

The market for rim-brake carbon rims has shrunk over recent years, displaced by disc-brake carbon rims which have emerged as the standard. Nevertheless, rim-brake carbon wheels remain a popular pick among many race riders, largely owing to their superior light weight. Meanwhile, a segment of rim-brake riders still own perfectly functional rim-brake frames, so they opt to upgrade to new rim-brake carbon wheels.


1. What Is a Carbon Rim Brake Track?

A brake track is the area on the side of a bicycle rim where the brake pads make contact during braking.
On a carbon rim-brake wheel, friction between the brake pads and the carbon rim surface converts kinetic energy into heat. The braking system must provide controlled friction while managing the heat generated during repeated braking.
Unlike an aluminum rim, a carbon composite rim consists of reinforcing fibers embedded in a resin matrix. Its braking behavior is therefore influenced by several factors, including the composite construction, resin system, surface finish, and brake pad compound.
A carbon brake track has three important design considerations.
Friction and braking control
The interaction between the brake pad and the braking surface influences braking response, modulation, and consistency. Surface condition, pad material, and environmental conditions all contribute to the result.
Thermal resistance
Braking generates heat, particularly during long descents. The resin system and overall rim construction must be appropriate for the expected thermal loads.
Surface durability
Repeated contact with brake pads causes wear. A suitable braking surface must account for repeated use, contamination, and inspection requirements.


2.Carbon Rim Brake Track Types Explained
ORNANBIKE offers five braking surface options for 700C rim-brake carbon rims for customization. They differ in their visible surface structure, material selection, or surface treatment.
2.1 UD Carbon Brake Track
 UD Carbon Brake Track
2.2 Basalt Brake Track — Basalt Fiber-Based Surface
Basalt Brake Track
2.3 3K Carbon Brake Track — Woven Carbon Surface
3K Carbon Brake Track
2.4 3K Twill Brake Track — Diagonal Carbon Weave
3K Twill Brake Track
2.5 Grooved 3K Twill Brake Track — Textured Braking Surface
Grooved 3K Twill Brake Track
We have 5 brak track surface options for professional cyclists to choose from. The high TG resin temperature of the 255° brake track solves the heating problem on the bicycle wheel of the rim brake.
If you have special requirements for the brake system, Grooved 3K twill will be your best choice.
The grooved track helps to evacuate trapped moisture between the brake pad and carbon rim under wet. it bears a higher temperature while braking, but for faster braking heat elimination. More friction, less lever force needed, and shorten about 30% braking distance. More friction to shorten the braking distance.

3. Explore ORNANBIKE Carbon Rim Brake Options

For bicycle brands and professional wheel builders or riders who wanted to upgrade your rim brake carbon rim, available options can be discussed alongside rim width, rim depth, tire configuration, and OEM/ODM customization requirements.

Explore our 700C Carbon Rim Brake Clincher Series | 700C Carbon Rim brake Tubular Series | 700C  Carbon Rim brake wheels series, or contact the ORNANBIKE team(info@ornanbike.com) to discuss suitable brake track configurations.

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