Bicycles make loud noises when braking, which is mostly caused by uneven friction and slippage between brake components.
The solution is as follows:
1. The drum brake system can be solved by polishing the brake pads with sandpaper.
2. V brake and C brake systems can be solved by scrubbing the brake pads and rims with neutral cleaning agent.
3. The disc brake system can be solved by wiping the brake discs and pads with alcohol or detergent. (Or the pad is seriously worn and needs to be replaced)
Extended information
Composition:
System structure
Bicycle frame, Among the 25 components such as tires, pedals, brakes, and chains, the basic components are indispensable. Among them, the frame is the skeleton of the bicycle, which bears the largest weight of people and cargo. According to the working characteristics of each component, it can be roughly divided into guiding system, driving system and braking system:
1. Guiding system: composed of handlebar, front fork, front axle, front wheel and other components . The rider can change the direction of travel and maintain balance by manipulating the handlebars.
2. Drive (transmission or walking) system: consists of pedals, bottom bracket, crankset, crank, chain, flywheel, rear axle, rear wheel and other components. The pedaling force of human feet is transmitted by the pedals through cranks, sprockets, chains, flywheels, rear axles and other components, thereby making the bicycle continue to move forward.
3. Braking system: It consists of brake components. The rider can control the brake at any time to slow down and stop the moving bicycle to ensure driving safety.
In addition, for safety, aesthetics, and practicality, lights, brackets, bells and other components are also assembled.
Composition
1. Body part: including
frame, front fork, handlebar, saddle and front fork assembly, etc., which are the components of the bicycle. main body. The transmission part includes pedals, cranks, sprockets, chains, central shafts, flywheels, etc. The pedals are manually stepped on, and the above transmission parts drive the wheels to rotate and drive the vehicle forward.
2. Action part: front and rear wheels, including front and rear axle components, spokes, rims (rims), tires, etc.
3. Safety devices: including brakes (brakes), lights, bells, reflective devices, etc.
According to needs, some accessories can also be added, such as brackets, hangers, safety forks, fenders, air pumps, etc. In addition, sports bikes, racing bikes, mountain bikes, etc. equipped with a speed change mechanism are also equipped with speed change controllers and front and rear derailleurs.
4. The composition of a dual-power bicycle for both hands and feet: a box made of alloy is added to the frame of a traditional bicycle. The box contains various transmission parts. Through the interaction of forces, it is realized With both hands and feet, you can simply push and pull the handlebars, so that you can move the car forward using the handlebars, which not only saves effort, but also keeps you fit.
Components
1. The frame component is the basic structure of the bicycle, and it is also the skeleton and main body of the bicycle. Other components are also directly or indirectly installed on the frame.
There are many structural forms of frame components, but they can generally be divided into two categories: men's frames and women's frames.
Since bicycles rely on the human body’s own driving force and riding skills to travel, the frame becomes an important structure to withstand the impact load generated by the bicycle while driving and to carry the human body comfortably and safely. The manufacturing accuracy of the body and frame components will directly affect the safety, stability, and briskness of the ride. Generally, spokes are of equal diameter. In order to reduce gravity, spokes are also made into variable-diameter spokes with large ends and small ones in the middle. There are also spokes made into flat streamlines in order to reduce air resistance.
2. Tires: There are two types: soft side tires and hard side tires. The soft-sided tire has a wider cross-section, can completely wrap the inner tube, has a relatively large landing area, and can be suitable for driving on a variety of roads. Hard-sided tires are light in weight and have a small landing area, making them suitable for driving on flat roads. They have the advantages of low resistance and brisk driving.
The pattern on the tire is to increase friction with the ground. The tire width of mountain bikes is particularly wide and the tread pattern is deep, which is also suitable for off-road mountain use.
3. Pedal component: The pedal component is assembled on the left and right cranks of the central axis component. It is a device that converts translational force into rotational force. When riding a bicycle, the pedal force is first transmitted to the feet. The pedal shaft then rotates the crank, crankset, bottom bracket, and chain flywheel to rotate the rear wheel, thereby moving the bicycle forward. Therefore, whether the structure and specifications of the pedal components are appropriate will directly affect whether the rider's foot position is appropriate and whether the bicycle can be driven smoothly.
Pedals: can be divided into integral pedals and combined pedals. No matter what style of pedal, it must have a tread, which must be safe and reliable, have certain anti-slip properties, and can be made of rubber, plastic or metal materials. The pedals must turn freely.
4. Front fork component: The front fork component is located in the front part of the bicycle structure. Its upper end is connected to the handlebar component, the frame component cooperates with the front tube, and the lower end cooperates with the front axle component to form a bicycle. guidance system.
Turn the handlebars and front forks to change the direction of the front wheel, which plays a guiding role in the bicycle. In addition, it can also play a role in controlling the driving of the bicycle.
The force on the front fork component is of a cantilever beam nature, so the front fork component must have sufficient strength and other properties.
5. Chain: The chain is also called the chain and the roller chain, and is installed on the connecting wheel and flywheel. Its function is to transmit the pedal force from the crank and sprocket to the flywheel and rear wheel to drive the bicycle forward.
Sprocket: Made of high-strength steel to ensure it reaches the required pulling force.
6. Flywheel: The flywheel is screwed and fixed on the right end of the rear axle with an internal thread, keeping the same plane as the sprocket, and is connected to the sprocket through a chain, forming the bicycle's drive system. Structurally, it can be divided into two categories: single-stage flywheel and multi-stage flywheel.
Single-stage flywheel, also known as single-sprocket flywheel, is mainly composed of outer cover, flat gear and core, jack, jack spring, washer, wire block, steel ball and other parts. The working principle of its single-stage flywheel: when the pedal is stepped forward, the chain drives the flywheel to rotate forward. At this time, the internal teeth of the flywheel are included with the jack. The rotational force of the flywheel is transmitted to the core through the jack, and the core drives the rear axle and The rear wheel turns and the bike moves forward.
When the pedal is stopped, the chain and the jacket do not rotate, but the rear wheel still drives the core and the jack to rotate forward under the action of inertia. When the pedal is pedaled in the opposite direction, the jacket Reverse rotation will accelerate the sliding of the jack and make the "click-click" sound more rapid. Multi-stage flywheel is an important component in bicycle transmission.
The multi-stage flywheel is based on the single-stage flywheel, adding several flywheel pieces, combined with the sprocket on the central axis, to form various transmission ratios, thus changing the speed of the bicycle.
Category:
Ordinary bicycles
Generally refers to kun bicycles. The riding posture is standing with bent legs. The advantage is that it is more comfortable and can be ridden for a long time. Not easily tired. The disadvantage is that it is difficult to accelerate in a bent-leg posture, and ordinary bicycle parts mostly use very ordinary parts, making it difficult to achieve high speeds.
Road bicycles
A type of bicycle used on smooth road surfaces. Since smooth road surfaces have less resistance, road bicycles are designed to take high speed into consideration, and often use bicycles that can reduce wind resistance. Curved handlebars, narrow high-pressure low-resistance tires, higher gears, and larger wheel diameters than ordinary mountain bikes. Since the frame and accessories do not need to be strengthened like mountain bikes, they are often lighter. Very efficient when riding on the road. Road bikes are some of the most beautiful bicycles because the frame requires no reinforcement and often uses a simple and efficient diamond-shaped design.
Exercise Bike
Healthy, fashionable, new concept, and a new concept designed exercise bike. The main feature is dual power for the hands and feet, with a speed of up to 40km/h; multiple ways of doing work, and fitness The effect is good. When riding this bicycle, your hands and feet can drive the bicycle at the same time, or you can drive and drive the bicycle with your hands or feet alone. It adopts the straight-line method of foot-pull pedals and the swing-type hand-pulled swing rod to perform work, which not only increases the driving speed of the bicycle, but also exercises the leg muscles and arm muscles. Obtained a number of national patents, it is suitable for middle-aged and elderly people to use as a means of transportation for fitness, and can also be suitable for young people to use for tourism and entertainment.
Track bicycle
A bicycle used on an extremely smooth indoor oval track. This bicycle has no brakes (for braking), no transmission, and no reversible flywheel.
Triathlon/Time Trial bicycle is a road bicycle used in triathlon and time trial sports. The biggest feature of triathlon and time trial is that it does not allow the use of traction airflow. (draft), that is to say, players must completely overcome the air resistance through their own strength and are not allowed to ride behind other players. Therefore, the design of triathlon/time trial bicycles attaches great importance to allowing players to maintain a position that reduces air resistance. Riding posture, and pay attention to reducing the air resistance of the bicycle itself. Eventing bikes also allow competitors to use similar muscle groups when biking as when running, making the transition from biking to running easier.
Mountain Biking
Mountain biking originated in San Francisco, USA in 1977. Bicycles designed for riding in mountainous areas usually have a transmission that can change to low-effort or fast gears. Some have shock absorbers installed on the frame. Some of the tire treads have chocolate tread to facilitate riding on unpaved bicycle surfaces. ride. Dimensions for mountain bike parts are generally in imperial units. The rims are 24/26/29 inches, and the tire size is generally 1.0-2.5 inches. The frame size is also expressed in imperial units, such as 14", 17", and 19" to indicate the size of the frame. It is divided into many categories in detail, and the most common ones we see are generally XC categories. Suitable for variable speed, thick tires and good grip. For off-road use, it has a shock-absorbing system to reduce bumps. It has greater overall strength and stronger impact resistance than ordinary bicycles.
Downhill bicycles
Downhill bicycles. Cycling, also known as DH in English, is a very challenging activity. Riders use special DH bicycles to glide on hillsides and even fall down mountains to seek excitement. The Austrian used DH to set a world record of 210.4KM/H. The frame angle of the downhill bicycle is different from that of the mountain bike, and the parts are the same as those of the mountain bike. You must wear a headgear when doing this activity. Helmets, armor and other equipment. The front fork shock absorption stroke is longer than that of mountain bikes and XC bicycles.
Children's bicycles
Children's bicycles are also called children's bicycles. Bicycles and children's bicycles are usually called "children's bicycles" or "children's bicycles" in mainland China, Taiwan and Singapore; in Hong Kong and Macao, they are usually called "children's bicycles". Children's bicycles are a category of children's bicycles. Including children's bicycles, children's strollers, baby walkers, children's tricycles, etc.
Travel bicycles
Developed from road bicycles, they are suitable for ultra-long-distance self-sufficiency. For travel, there is a more comfortable and relaxed frame geometry design, it can carry loads, it has a very low lowest gear, and it uses wider tires. In terms of accessory selection, the pursuit of reliability and durability rather than weight reduction is often used. Mountain bike pedals are often used . Evolved for the mountain. Most of them are the same as the mountain bike but the configuration is more flexible. For example, the handlebar can be changed into a butterfly shape and can be used in many positions to reduce fatigue for a long time. The front fork can also be equipped with shock absorbers. Shock-absorbing. The wheels can be 700c or 26 inches. But the brakes are usually V-brakes. It is easy to install racks, roof covers, and camel bags. In short, all changes are to increase durability and reduce wear on long distances. The generation of fatigue.
Freewheeling bicycles
Freewheeling bicycles originate from track bicycles. The flywheel is fixed. If you step forward, the bike will go forward, and if you step backward, the bike will move backwards. There are some alternative bicycle enthusiasts who use abandoned track bicycles as work transportation. They can travel quickly in the city and are cheap. At the same time, they require certain riding skills. These characteristics make them very popular among bicycle enthusiasts in countries such as the United Kingdom and the United States. It quickly became popular and became a kind of street culture. Major bicycle brands also followed up, developed and promoted bicycle models, making them popular among the public and becoming the most popular bicycle style in the city.
Pure dead-flying requires certain skills and is dangerous, so the products developed by these manufacturers are capable of both dead-flying and live-flying, and are equipped with brakes to ensure safety.
Multi-person bicycles
Also known as collaborative bicycles, two or more people work together, with the first person controlling the direction. It is mostly used in tourist attractions for couples, families and friends to enjoy.
Folding bicycles
It is a type of vehicle designed for easy carrying and loading into the car. In some places, railways, airlines and other public transportation allow passengers to carry foldable bicycles with them. Collecting and bagging bikes.
BMX
Also known as BMX, there are many types of bicycles, such as flat bikes, street bikes, dirt slopes, etc. Each method of playing is different. In addition, this picture is not a BMX but a conceptual one. climbing bike.
Technical bike
Technical bike is a kind of bicycle specially used for extreme sports. This type of bike has made many modifications in order to be more suitable for stunt performances, such as being lighter but extremely strong. The body of the car has no transmission, no storage rack, and even the brake mechanism has been removed.
(Baidu Encyclopedia-Bicycle)