Carbon Bike is mainly used in middle and high grade competition bicycle. As an emerging material, carbon fiber is mainly used in frame (carbon frame), fork, wheelset (carbon blade rim), etc.
Manufacturing materials: Bicycle materials include chromium-molybdenum steel, carbon fiber materials, aluminum, titanium, carbon fiber, magnesium and other new materials.
Carbon Fiber (CFRP)
Carbon fiber not only has the inherent intrinsic characteristics of carbon materials, but also has the softness and processability of textile fibers. Its specific gravity is less than 1/4 of steel, but its strength is very strong. Its corrosion resistance is outstanding, and it is a new generation of reinforcing fiber. Carbon fiber is widely used in civil, military, construction, aerospace, and supercar applications.
Advantages and disadvantages of carbon fiber bicycles
Carbon Fiber Frame Advantages
Carbon fiber frames are characterized by “lightness, good steel, and good impact absorption”. However, it is not so easy to give full play to the excellent performance of carbon fiber technically, and the quality of carbon fiber material varies greatly among manufacturers. Bicycle manufacturers are unlikely to use high-grade carbon fiber to make frames, considering the cost issue. Despite the above-mentioned practical problems, carbon fiber frame has the advantages that other materials do not have, and it can make light weight bicycle of about 8 or 9kg. It is not like some light aluminum frames that feel a backward pulling force when climbing.
1) Light weight frame can be made
Carbon fiber frames are made by laminating carbon fibers in the direction of stress and gaining strength. The carbon fiber frame is very light because of its density and strong tensile strength.
2) Good impact absorption
Carbon fiber is used in various fields such as making prosthetic legs for disabled people in sports or special springs. It is also used to make bicycles without shock absorbers by its excellent impact absorption performance. For example, the ELEVATED frame of SCOTT factory is famous. However, the quality varies a lot from one manufacturer to another, and some of them are very stiff, so this frame can only be known as good or bad after riding.
3) Various shapes of frames can be made
The basic molding method of carbon fiber is to lay the fiber sheet on the mold and then flow into the resin and burn it. Various shapes of frames can be made, such as TREK’s Y frame.
Disadvantages of carbon fiber frame
1) Complex stress calculation
The carbon fiber frame is composed of carbon fiber, which is characterized by strong tensile strength but weak shear strength. Complex stress calculations (longitudinal rigidity and transverse rigidity) are required for processing, and the carbon fiber pieces are overlapped and molded according to the calculations. Processing technology varies from manufacturer to manufacturer, and it is important to choose products from experienced and reliable manufacturers.
2) Difficult to change the size
It is difficult to change the size because the mold is made and molded. It is not possible to change the size of the product to meet the orders of multiple sizes and styles.
Does the resin deteriorate? This is a subject that will gradually turn white when it is exposed to sunlight. Of course, this phenomenon is related to the technology of the manufacturer. It is better not to leave it in the sunlight.
Types of carbon fiber bicycle
Full carbon: All carbon fiber bicycle parts are made of carbon fiber.
Semi-carbon: Many bikes are made with aluminum alloy + carbon fiber. For example, a frame may use carbon for the top tube and aluminum for the rest (or carbon for the rear triangle—), carbon fiber for the front fork arm, and aluminum for the front fork tube, so it can be said to be semi-carbon.
Carbon wrapped: Some frames, handlebars, grips, cranks, forks, seatposts and other accessories are made of aluminum alloy by the manufacturer, and then a layer of carbon cloth is wrapped on the surface, which is what is carbon wrapped.
The relationship between carbon fiber bicycle and the environment
Carbon fiber contains resin so it can also be said to be acid resistant. However, for carbon fiber, more consideration should be given to the inherent factors, it uses resin so the possibility of resin aging exists. When not in use, carbon fiber bicycles should be protected from the sun. Sunlight and ambient temperature have the greatest effect on them.