About the Bike frame introduction

The basic composition of the frame

Head Tube: The head tube is the most front part of the frame, which connects the front fork to the frame. Bearings are usually installed in the head tube so that the front fork can rotate smoothly, thus controlling the direction of the bicycle.
Top Tube: The top tube is connected to the head tube and the seat tube and is part of the front triangle of the frame. It sits on top of the frame, providing the rider with stable support and helping to distribute the force while riding.
Down Tube: The down tube is one of the longest parts of the frame, extending below the head tube to the bottom of the frame and connecting to the risers of the rear triangle. The lower tube is one of the main load-bearing components of the frame, responsible for bearing the weight of the rider and the impact of the ride.
Riser (Seat Tube) : The riser is a part of the rear triangle of the frame, which connects the lower tube and the seat tube. The height of the riser determines the seat height of the rider and has an important influence on the riding posture and comfort.
Seat Stay: The seat stay connects the riser to the rear of the frame and is an important part of the rear triangle. It is responsible for supporting the rear wheels and helping to distribute the power while riding. The design of the rear upper fork has an impact on the rigidity and comfort of the vehicle.
Chain Stay: The chain stay is also part of the rear triangle, which connects the bottom of the frame to the rear axle. The rear fork is responsible for supporting the rear wheel and transmitting the power while riding. The length and Angle of the rear lower fork have an important effect on the geometric structure and performance of the vehicle.

The material of the frame

Chrome molybdenum steel (steel frame)

Advantages: Chromium and molybdenum elements are added to the carbon steel frame, which improves the strength and corrosion resistance of the steel. It has good rigidity, strength and weldability, and is easy to process. The chrome-molybdenum steel frame feels comfortable on the road and is suitable for long-distance riding. In addition, damage to chrome-molybdenum steel frames is relatively easy to repair, and broken locations can be rewelded together.
Disadvantages: The weight of chromium molybdenum steel frame is relatively heavy, and it is easy to be oxidized and rusted. However, the modern chrome molybdenum steel frame has been reduced to a certain extent by means of tube extraction technology.

Aluminium alloy

Advantages: Aluminum alloy frame has the advantages of light weight, corrosion prevention, high rigidity and so on. Aluminum alloy has a low density and is easy to form, so it is very suitable for the manufacture of car frames. Aluminum frames are relatively inexpensive, especially when compared to carbon fiber frames. In addition, the manufacturing process of aluminum alloy frames continues to improve, and pipes of various shapes and thicknesses can be manufactured to meet different design needs.
Disadvantages: Compared with materials such as carbon fiber, the strength and durability of aluminum alloy frame is slightly inferior. The fatigue resistance of aluminum alloy frame is poor and difficult to repair.

Carbon fiber
Advantages: The carbon fiber frame has the advantages of extremely high strength, light weight and corrosion resistance. The carbon fiber frame has a clear road feel and can provide a better riding experience. In addition, carbon fiber frames can be manufactured into almost any shape to meet different design needs. The durability of the carbon fiber frame is also high, with extremely high fatigue resistance.
Disadvantages: The manufacturing cost of carbon fiber frames is higher and the price is expensive. Carbon fiber frame resistance to impact is weak, once damaged is difficult to repair. In addition, the manufacturing cycle of carbon fiber frames is longer.

Titanium alloy

Advantages: Titanium alloy frame has the advantages of high strength, light weight and corrosion resistance. The durability of the titanium frame is also very good, almost "indestructible". The titanium frame is comfortable to ride and can provide flexibility similar to carbon fiber.
Disadvantages: The refining and processing process of titanium alloy is complex and costly. Therefore, the price of titanium frame is also relatively high. In addition, the manufacture of titanium frames is difficult and requires a lot of expertise to produce high-quality frames.

 The design of the frame

Structural design
The structural design of the bicycle frame needs to take into account many aspects, including the geometry of the frame, the thickness and shape of the pipe, the design of the joint, etc.
Frame geometry: Determine parameters such as the Angle, length and height of the frame, which directly affect the handling, stability and comfort of the bike. For example, the Angle of the frame should be designed so that the rider can maintain a comfortable posture during the ride and reduce the pressure on the lower back.
Pipe design: Select the right pipe shape and thickness to optimize the strength and weight ratio of the frame. Modern frame designs often use tube extraction technology, that is, tubes of different thicknesses are used in different parts to reduce weight while maintaining strength.
Joint design: The joint of the frame is where the stress is concentrated, and special attention needs to be paid to the design. Use reasonable welding or joining technology to ensure the strength and durability of the joint.

Human body engineering

Ergonomics plays a crucial role in the design of bicycle frames. By optimizing the design of the frame, seat, handlebars and other components, the pressure and burden on the body can be reduced during the riding process and the riding comfort can be improved.
Frame size: The size of the frame is determined according to the height, weight and riding habits of the rider. The appropriate frame size can enable the rider to maintain the correct posture during the riding process and reduce unnecessary fatigue and injury.
Seat design: The design of the seat should take into account the weight and riding habits of the rider to provide adequate support and comfort. Some high-end bikes will also use an adjustable seat design to meet the needs of different riders.
Handlebar design: The shape, width and Angle of the handlebars all affect riding comfort. Reasonable handlebar design can make it easier for riders to control the bike and reduce hand and wrist fatigue.

Frame maintenance and maintenance

clean
Regular cleaning: Use warm water and a mild cleaner (such as soapy water) to thoroughly clean the frame, paying special attention to removing dust, dirt and oil from the surface. This helps prevent corrosion and scratches.
Soft brush or sponge: Use a soft brush or sponge to carefully clean the dirt on the frame, especially the areas near the chain and gear, which are prone to dirt accumulation.
Thoroughly rinse and dry: After cleaning, rinse the frame thoroughly with water and dry it with a clean cloth or towel to ensure that there is no residual moisture to prevent rust.Tighten with appropriate tools to avoid thread damage due to excessive force.

Finish maintenance

Check the finish: Check the finish of the frame regularly for scratches, fading or peeling. These signs can be signs of a damaged or aging frame.
Repair and repaint: If the paint is found to be damaged, it should be repaired in time. If the damage is more serious or the paint is aging, you can consider repainting to protect the frame and restore its appearance.

Inspection and fastening

Threaded connections: Regularly inspect and tighten all threaded connections on the frame, including bolts, screws and screws. Make sure they are all properly installed and secured to prevent loosening that could cause deformation or damage to the frame.
Key parts: Pay special attention to check the joints between the frame and the handlebars, wheels and other key components to ensure that they are firm and reliable