Depending on the carbon fiber weaving method, the rims will have different appearances; the K number is the main reason for the appearance difference, and the "K number" refers to thousands of monofilaments in a bundle of carbon fibers. 3K means 3,000 monofilament carbon fibers in a bundle of carbon fibers. 12K means 12,000 monofilament carbon fibers in a bundle of carbon fibers. 

The 3k 12k UD refers to the thickness of the carbon fiber pattern.The thinnest 3k pattern is the smallest grid above.

The higher the K number, the more complicated the process and the more expensive it is, but there are no big difference in functionality, it just meets the various aesthetic needs of consumer. The smaller the carbon fiber object, the smaller the grid, so that it can achieve better force.

There are five kinds of appearances for the SuperroadBikes rim products, the following is a comparison and analysis:

UD texture

As the name implies, uni, meaning one, all of the fibers are oriented in the same direction. This gives uni-directional (UD) fabric some high strength benefits than other weaving method. Rather, there are continuous fibers that increase the strength and stiffness. Another benefit is the ability to tailor the layup with better control for performance characteristics.

3K texture

This texture is woven from 3K width tows.

Features: dense small cells, strong decoration, high recognition (that is, carbon fiber material can be seen at a glance), and high interlayer shear stress. The woven fabric has no anisotropic characteristics. It has the same tensile strength in each direction, which is mainly to meet the diverse needs of customers for appearance.

12K Texsure

This texture is woven from 12K wide tow.

Features: Compared with 3K plaid, it is larger grid, with strong decoration, high recognition, and high inter-layer shear stress.

Twill has good pliability and can form to complex contours, and it is better at maintaining its fabric stability than a harness satin weave.

2x2 Twill is likely the most recognizable carbon fiber weave in the industry. It is used in many cosmetic and decorative applications, More and more personality seeker will choose it.

3K Twill Texture

The picture above is the carbon fiber 3K twill. The carbon fiber circle of this pattern has been very popular in the past two years. Compared with UD and conventional 3K, it is indeed ingenious and bolder! It better caters to different consumer preferences and is more personalized.

12K Twill Texture

This texture is made by weaving a tow with a width of 12K.

Features: The pattern is more avant-garde, has a sense of design, high recognition, and high shear stress between layers, which has become a new trend.

According to those analysis ,hope you can find the one you prefer.