The following are all typed verbatim by me
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Craftsmanship process for making aluminum rims for bicycles
You just don't lose money.
How can you grab a meal when others are doing well?
The market is also too small.
It is the first extrusion of aluminum profiles, to be processed in batches, to open the mold, China's poor performance of aluminum, can not do high-grade racing cars, big planes. The 500,000 yuan are not enough for the first batch.
The profiles are cut off, then rolled into circles on several wheels and welded with carbon dioxide gas protection.
Drill the spoke holes. You just don't lose money.
There are imported aluminum, imported production line, tens of millions of yuan, right, the domestic belongs to the special equipment, you can do it yourself, if you entrust others to design and manufacture, absolutely lose money.
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What is the brand, model, and price of the lightest electric scooter, and what stores sell it?
It is produced in Beijing, Beijing Shenzhou Judean New Energy Technology Co., Ltd, the factory's main production of power lithium batteries, with a kind of the most compact bicycles, super lightweight, aluminum alloy body,
Price of 3,000 yuan, the battery part of the accounted for 1,500 yuan, the battery is in the middle of the crossbar of the bike, in the crossbar inside. The battery is in the middle of the crossbar, inside the crossbar. It's good for about 15 kilometers on a single charge, about 10 amp hours of capacity, 24 volts. It is front wheel drive, the motor is mounted on the front fork, and the plastic rim on the front wheel has internal gears that match the gears on the motor.
Shenzhen ZOOM Rheem, Shenzhen Xinlong Health Industry Development Co., Ltd (No. 11, Longfa Road, Longhua Street Office, Bao'an District, Shenzhen; store: No. 35, Wenxin 1st Road, Nanhai Avenue, Nanshan District, Shenzhen; 0755-83131635 83131272) also produces similar compact electric bicycles, also with aluminum bodies and the same specification lithium batteries, the difference being the use of a Rear wheel hub motor, 2880 yuan / vehicle, he said that after charging can run 40 kilometers, I feel is said on the big. The design, structure, technical and engineering difficulties, and safety of assisted vehicles and electric vehicles are different and should not be confused with each other, the following is their distinction;
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Qingdao, where is the Japanese Yamaha e-bike specializing in (phone)
Nowadays, they are all smuggling-based. About 500 yuan to 1,000 yuan a, this car is different from the domestic electric car, is aided, you do not ride, his motor does not turn, and you ride the torque and the motor drive current is proportional to the relationship. When you ride too much torque over a predetermined threshold, the motor drive current will drop linearly. When you ride faster than 16 km/h, the motor drive current drops linearly, to the point where the bike speed is greater than 24 km/h and the motor drive current drops to zero. If the wheel is stuck and you apply a hard torque to the bicycle pedals, the motor moves a bit, and if the car still doesn't move, the input current to the motor is cut off and you have to turn off the switch to restart it. The overall structure of this torque sensor is very reasonable, can be rotated transmission components torque transfer to a fixed angle displacement sensor, whether in the mechanical structure of the material, design, processing, reflecting a solid industrial foundation; similar to this, the bicycle's internal gearshift, the domestic 40 years ago on the success of the imitation, formally installed in the commercial bicycles for sale because of the limitations of the material and processing conditions, this kind of from the Because of the limitations of materials and processing conditions, this reversal engineering approach, which started with physical mapping, never lasted long. Japanese law requires headlights on bicycles, generally using friction front wheel driven generators, a few use front drum generators, which have rotating outer permanent magnet tiles, fixed inner permanent magnets, and use a structure similar to the motor pulse speed generator in industrial control to clamp the generating coils with soft iron with spikes on both sides. Historic Chinese bicycle generators were of single-pair stage construction, with an external wire to be connected. The majority of Japanese assisted bicycles are three-speed internally shifted, usually with a center-mounted motor with reduction gears and overrunning clutch. Most of the batteries that come with the smuggled over Japanese mobility scooters are at the end of their charge/discharge cycle life, and there are original 110 volt powered chargers. Generally speaking the Suzuki brand has the most powerful motor.
You just commission a seaman to buy it. Be careful to beat the tax, bike theft is a criminal offense in Japan! Japanese assisted bikes generally use brushed motors, and the maximum power of the motor on a bike is regulated by law; for 1.5 to 15 RMB, you can convert it to both assisted and electric, without replacing the original controller.
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What are the drawbacks of using lithium-ion electric bikes?
For chemical secondary power sources, it's all about the longer the charging time, the lower the charging current, the higher the charge/discharge cycle of the battery, which, in layman's terms, means that the battery has a long life.
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What kind of bike is the most energy efficient and fast?
700 tires, 27-inch wheel diameter kilometers racing the most energy-saving, but the car tire strength is low, embedded in the grooves will be their own spokes pierced through two holes, which is still a law, every time exactly two, no more, no less; can not be in the bumpy roads, can not carry others.
There are sold for 600 yuan/vehicle, bearing material is poor, the normal price is 3000 yuan/vehicle, at least Taiwan's bearings.
Generally recommended to use the Japanese production, smuggled in the second-hand bicycle, usually 300 yuan / vehicle to 500 yuan / vehicle, ordinary 24-inch, 26-inch, 1 and 3/8-inch cross-section of the ordinary tires can be, quite suitable for long-distance riding, such as delivery of plane tickets, delivery of photographs, delivery of courier salesman, appliance repair personnel. Imported have 27 inch 1 and 3/8 inch cross-section, but also very good for tall people riding, and is generally similar to the front of the women's car beveled beam, the disadvantage is that the replacement tires to build a large Zhengxin, Jianda, Hua Feng and other Taiwan rubber companies to buy, many regions do not have the goods supply. Brand new bikes produced in Japanese companies in China are not as good as the quality of used Japanese bikes smuggled in. Pay attention to be equipped with motorcycle locks, handcuff the bike to fixed water pipes, traffic signs to prevent theft. Mountain bike tires are too wide for riding on rough mountain roads, good for carrying heavy loads, and tiring to ride on city roads.
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Hello everyone, Oh, I'm 19 years old male, is a college student, in the local on, home in the city, the school is in the suburbs, there are about 12 kilometers, everyone suggests whether you need to buy a motorized bike or bicycle?
Please help me choose, small electric car is quite stylish. Moto kind of electric car basement is not convenient Road race bike Mountain bike is a bit heavy
Thank you all! Question added: do not live in school, get up early to go to school, come back at noon, no classes in the afternoon.
Preferred road racing, usually called 700 tires, inner tires as thin as a salami, because the tires are thin and narrow, riding is very labor-saving, the whole car is lightweight, can not be loaded, can not carry cargo, the advantage is that it can be convenient to carry on the dormitory, placed in the hallway or next to the staircase, the implementation of the active anti-theft; the disadvantage is that the inner tube cross-section of the small, intolerant of vibration, fear of potholes on the road surface, so that is said to be road racing Racing car, for the road quality requirements, and are ordinary brakes, imported no disc brakes, riding fast, weak braking capacity, braking skidding distance is long, poor safety. Domestic road racing, low-grade 400 yuan on the normal price of 3,000 yuan, this kind of bike sells less people, lose less, because of expensive, the owners go out even to the stalls to eat, but also will keep each other in sight distance, always pay attention to the night are carried home. Those 30,000 yuan to 50,000 yuan of carbon fiber road racing, lightweight make people marvel.
Mountain bike tires are too wide for off-road use, for bumpy road conditions, and the ride is just heavier than the average 1 and 3/8ths cross-section of an ordinary 26-inch bike.
Battery car, electric bicycle usually use 12 ampere hours of battery, the new battery will run 15 kilometers, battery charging and discharging life, according to the general use of one year is appropriate, generally used to half a year, it is 10 kilometers of continuous road, for you is not suitable for the ordinary lead-acid batteries, heavy electric vehicles, if the use of lithium batteries, in your case, with two sets of 10-ampere hours of battery packs, the battery is 3000 yuan, the ordinary lead-acid batteries. If you use lithium batteries, in your case, use two 10 amp hour battery packs, the batteries will cost you 3000 yuan, and the ordinary electric car is also equipped with a set of batteries, but also to modify the domestic enterprises to do power lithium batteries are very few successes, but also in Tianjin, Beijing, there are a few, and general lithium batteries, nickel-metal hydride batteries, nickel-cadmium batteries in the electric car are going to explode. Like you, the charging time is not enough, rapid charging for any secondary battery to shorten the number of charge-discharge cycles, is usually referred to as the service life, in your specific case, it is necessary to purchase four sets of lithium batteries, at home and school placement of two chargers, the school's that is usually continuous charging, because the high-energy batteries itself is a bomb, the original foreign assisted bicycle charger in the battery pack There are temperature sensors in the battery pack, foreign chargers do not have spike pulse ultra-high voltage output, charging unattended even if; domestic chargers for power lithium batteries or power nickel-metal hydride batteries, power nickel-cadmium batteries charging, you do not want to charge inside the dormitory, or to spend money to ask the door watchman for the proper and safe, and don't expect to claim for the battery was stolen.
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Principle of Mechanical Work: Human and Bicycle
Bicycle and human walking than, obviously the bicycle saves energy, seems to save the distance, this is how it is? Tell me if you know, and be more detailed!
Decades ago there are open conclusions; people walk, each step to raise the center of gravity of the human body 2 cm, in the tendons and gravity *** with the role of forward movement; riding a bicycle human body to do the same direction of work are the same unchanged, but also glide.
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Buying a bicycle, how to choose?
I'm a girl, and I want to buy a bicycle to commute to work, which is environmentally friendly and fitness, lol~~Good idea, right?
How to choose a bike and what to look for?
Or what is the best style to recommend?
Please give some advice wave!
Question added: Brand? What brand is good?
Decades ago, China imported three guns and so on foreign brands of bicycles, its women's bicycles are characterized by high head handles, the body is also characteristic , creating the image of a lady, please look inside the old photos.
Nowadays, you can generally buy Japanese bicycles, you can entrust the seafarer to bring, high-grade bicycle line can also be imported on behalf of. There is also smuggling.
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Is the EV charger model a one-charger-multipurpose type or is it paired by EV model?
The chargers that are well designed and manufactured can be applicable. Generally according to the output power is divided into three categories: information class electronic appliances battery charging, such as cell phones, MP3 and so on; electric vehicle battery charging; car battery charging. In the industrial and transportation industries, there are also battery charging for railroad locomotives, dockside forklift batteries, telecommunications and servers, as well as battery charging for programmable telephones and so on.
For electric vehicles, there are 24V, 36V, 48V output voltage, can limit the final charging voltage; output current 1A, 2A, 3A, 4A constant current output is basically universal. As for whether to split into multiple simultaneous charging, that is the basis of 30 years ago, people's coal mine lamps are batches in charging.
In fact, the design is more difficult to take into account is the target charging of long-distance, specifically, high-rise households without elevators, indoor installation of chargers, with a low voltage, through the 50-meter to 100-meter-long wire, charging of electric vehicles on the ground to ensure that the charging current is sufficiently strong, and at the same time in the end of charging, the terminal charging voltage is not exceeded. If required to achieve the comprehensive requirements of low power consumption, will require a high level of skill, for example, the battery being charged in the absence of charging power supply, the battery being charged to the control circuit of the discharge current how to be as small as possible, which is a number of methods can be selected. The DC resistance of the actual long-distance charging line may be 10 ohms to 30 ohms, how not to use a four-wire system (even if the four-wire voltage regulator, current regulator power supply such a basic circuit design, today's universities from the students to the high title, high degree of education of the teachers are not many people can do it) of the charging power supply but with a limiting charging voltage, constant-current output, telemetry battery voltage, telemetry battery temperature rise, battery bulging? The perfect design to ensure that the battery being charged with the charging power supply polarity is not normal when the automatic protection (China 35 years ago there is public information published, the current switching power supply, but also reverse battery on the explosion!!!) , for high-energy batteries especially emphasize the charging voltage must not have high-voltage pulse burrs, which can easily cause the battery to explode!!!! , ordinary switching power supply charger will not adapt.
Because I am unemployed and laid off, forced to retire ten years early, it will not have been pragmatic design of the relevant published free of charge, this responsibility in the Overseas Chinese Affairs Office.
I charge my electric car through a 100-meter-long low-voltage line, with a diode in the battery box to prevent malicious discharges, and a few hundred ohms of resistance in parallel with the diode to telemetrically measure the voltage of the battery pack (after cutting off the charging power supply, measured by a pointer voltmeter on the charging machine, and with a diode in series between the voltmeter and the charging power supply, to prevent the battery from discharging the charging machine and lowering the voltmeter readings. By more means, you can measure whether the electric car is stolen. Of course, the improved wiring is very complex, and there are well-established electronic circuits on the side of the EV to ensure that the charging power supply voltage is well above the rated end-of-charge voltage of the battery, and that the battery is still not overcharged at the end of charging.
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Kneeling for 24V30A charger circuit diagram
Now there are a lot of such products for sale ah.
Make your own to customize a high power transformer, generally speaking, one that outputs 24 volts to 33 volts AC and 1 kilowatt (should be volt-amperes), taking care to draw more than a couple of headers between 24 volts and 33 volts on the secondary.
The simple way, is to use the secondary output with full-wave rectification, direct output to the battery, to be connected in series with an ammeter, to be connected in parallel with a voltmeter, with the switch of an industrial appliance (Zhejiang Province, the area of the prevalence of) manually regulate the output voltage and the output current, according to the charging process manually adjusted. As for automatic voltage stabilization, automatic current stabilization of the charger, in 35 years ago, the silicon controlled control method information is publicly published and printed. Simple emergency method, is to use sufficient power of the running lamp transformer (36 volts safe voltage output), isolation transformer, welding machine transformer, to its secondary plus winding a few turns, forward series or reverse series, adjust the output voltage and charging current to the appropriate range.
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How to get rid of the black oil on the bicycle chain on the school uniform
Remember, the chain of the foreign high-level bicycles is to use lubricating paste similar to the floor wax, automobile polishing wax, the chain does not have the color of a rough look, you can use the ordinary floor wax, automobile polishing wax instead of, using the Before cleaning the chain with diesel, kerosene, don't use gasoline!!!! Including washing gasoline, that's too dangerous.
You're using an outdrive bike, right? I have modified a couple of normal outdrive bikes with flex chain covers, and even showed them to a Japanese academician and PhD supervisor. The vast majority of external derailleur bikes do not have a drive chain cover, and a small number of plastic external derailleur bikes are produced in Taiwan without a drive chain cover. Nowadays, half of the popular smuggled Japanese bicycles are internally shifted, and the steel of the car is good, light and durable to ride. However, a good horse with a good saddle, to pick a good lock ah;
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How to measure the bicycle pedaling power
Reporting the head:
Nowadays a large number of smuggled imports of Japan's assisted bicycles have a torque sensor on the bike, can directly obtain the torque signal; this kind of car slightly Newer, there are speed sensors, calibrated to measure the riding power.
The test can also be done at a motor vehicle test station. After actual testing, the torque of a person pedaling a bicycle fluctuates greatly, and if you estimate it as an average, the error is very large, and the duty cycle is about one to ten. If you want a calibrated bike and a multiplier to find the power, this effort will take months.
Here is the actual, real-time testing of bicycle pedaling power on the road, to be from the constantly rotating mechanical structure, through the conversion of the mechanism, with a fixed on the body of the sensor to measure the torque and rotational speed, if you want to do it by yourself, even for the Chinese institutions of higher learning, advanced technical schools, are not realistic. Industrial measurement and control on more than 50 years ago, the standard method, is to paste four pieces of strain gauges on the drive shaft, with pure silver collector rings and brushes to lead the tiny strain gauge resistance changes. In sports exercise equipment, medical test equipment, there are fixed frame bearing, driven by the test person fixed motor to test the human drive power, by adjusting the ratio or excitation current and load, adjust the load characteristics. In the distant past, pumps were driven by men, and the power was discounted according to the height and flow rate of the liquid being lifted. Nowadays, dynamometers are also tested by applying strain gauges to a stationary bearing housing, which is subject to complex calibration, unlike the previous method, which is straightforward.
There are already enough sensors on Japanese assisted vehicles to calibrate them for you and provide a multiplier to directly derive the power accrued value, and if you are a current student at any college or institute, you can be provided with a free service, and the total cost of the materials, including the bike, will be about 1,000 to 1,500 yuan at the minimum, and what the price of a strict design can be searched on the Internet for an online opinion. The advice, in accordance with the routine, do not do so over 10,000 yuan no one cares about you; logistics company's cost of another, guaranteed by the school can not prepayment; to see the accuracy, all the information, detailed drawings mailed to the school you provide. Japanese mass production of computer hard disk assembly with electric screwdriver with torque measurement and control system, the basic price is 40,000 yuan a set; for stainless steel screws pick up, clamping with the cost of the vacuum system.
Please contact the address below directly,
Where can I get wholesale bicycles?
It is very simple, you go to the streets of cities and towns of bicycle sales store long-term observation, you can see is a bicycle manufacturers regularly open truck delivery, these bicycle companies, you according to the sale of bicycle brands, you can find out the factory address from the Internet, usually by the general agent supply, to be supplied in batches, a single unit to buy, go to the next level of the other sellers, for example, specialty stores. You are so remote there, delivery to large quantities, why do you need to pressure goods and funds? Now it's all about finance, financing way of selling, a little carelessness will lose a lot of money!!!! For capital preservation of the smallest scale sales approach, if you are unemployed, you can go to the wholesale market of bicycle parts procurement parts, back to assembly, provided that you at least know how to adjust the steel ring, simply put, is the first wear steel wire, on the nut, the knife frame is still particularly difficult to on, based on the principle of thin shell mechanics, can not be there protruding on the tightening of that side of the steel wire, but first all the initial on the tightening, and then according to the deformation of the steel ring concave-convex, with the Chalk drawings, and then respectively tighten, respectively relax, all do it again, before the next round of adjustments. In foreign countries, it is with fully automated equipment automatically on the nut, automatic adjustment of steel wire, Germany to do road racing production equipment, the United States to do the ordinary car, Taiwan imitation can only be a big road goods. These bicycle parts wholesale markets and stores, to the size of a particularly large, pick up the goods is cost-effective, you can go to the bicycle repair store near the long-term observation, you can see the accessories supply small stalls regularly come to the distribution, supply, delivery, tracking, in leaving the bicycle repair store outside the line of sight to the salesman asked for a business card, you can find the intermediary. For the novice just on the road, to the wholesale market of bicycle parts in Fangcun will be able to go to that neighborhood, looking for hitchhiking motor vehicles, give money to carry you to go. If you are studying students, right as the basic skills training even if, to the academic priority.
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Which brand of e-bike is suitable for use in the northeast
My family is in Manchuria, Inner Mongolia, next to Russia, and in winter the coldest may be 3 4 ten degrees, and commuting to and from work by bicycle is very hard, and I want to buy a good quality battery suitable for use in the black of us in the use of the electric bicycle
The general high-energy lithium batteries at low temperatures can not put out of electricity, the United States military equipment in the high cold areas can only use nickel-cadmium batteries, you use lead-acid batteries are not good, or fuel motorcycle for real, to warm up before starting. The cold-resistant e-bike is the embodiment of high performance.
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How to have a better anti-theft method for new bikes
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If you are the public security director, what is the best way to deal with the wind of bike theft?
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Does anyone know the principle of a lock with a key?
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What device should I use for anti-theft?
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Is there any kind of guardrail that can play a role in protection against burglary and the property is allowed to install?
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Please ask the domestic, home security doors used, without mechanical keyhole, the best intelligent security locks are that kind?
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The car is placed in the downstairs without a lock anti-theft who has high tips?
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Lock cylinder price
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Please ask what lock is the most secure for electric cars, such as ....
Welcome to repost, but do not mention any of my private information;
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Explore Airless Bicycle Tires
Things that countless people have done research on, topics that countless large corporations have spent huge sums of money researching on, so don't bother wasting your mind on them.
There are just a very few small businesses left producing them.
Jiang Qing was concerned about how well foreign military vehicles worked with airless tires back in the day, when they loved to discuss coups.
Vacuum tires are essentially tubeless tires that must be inflated!!!! Requirements for metal hoops high precision, good rigidity, with the outer tire with and without air leakage, in order to be punctured tires after the tire repair convenience, it is necessary to use a high viscosity, with fibers of the automatic tire repair liquid injected into the interior of the tire, the import of tire repair liquid starts at least 100 yuan or more, the import of a complete set of bicycle vacuum tires along with the wheel hub, spokes, planter boxes, axles, bearings, to be more than 3,000 yuan RMB.
Solid core tires are sure to burn tire cores at high speeds ！！！！
Polyurethane integrated tires, that is, the inner and outer tires are integrated, not long to go, will fall off the hub, can only be used for strollers, handicapped vehicles.
The outer tire is the traditional rubber tire, the inner tire is polyurethane, go not long, the inner tire softens, walk heavy.
Hollow integrated rubber tires can still make do, the production plant is also less, narrow sales well.
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YAMAHA electric car how
Yamaha only produces assisted vehicles, not the production of electric bicycles ！！！！！！
Yamaha motorized scooters are less powerful and smaller than domestic ones.
People's brakes when rola brakes, no brake noise, braking torque, is a multi-roller eccentric rising brake.
Yours is an impostor.
Japanese boosters are basically 24-volt-powered, and a very few are 36-volt-powered.
I have converted several Yamaha mobility aids to be both mobility aids and electric at the same time compatible for dual use.
Owned by Yamaha motor-assisted vehicle controller is Yamaha's original controller all hollowed out, just use his shell, in the same volume, replace the controller occupying the same space, all with discrete components and general-purpose integrated circuits, than the original controller is more energy-efficient, the same battery can be driven a greater mileage; with the domestic brushed motor controller is different from the transformed device, push backwards bike with less resistance, as easy as the original Yamaha booster.
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Quanzhou where to sell wheelchairs for dogs? My dog can't walk on his hind legs, and I've read on the internet that they are for sale outside of the province, so I don't know if there are any in Quanzhou.
Japan's human tricycle is very suitable, this is a small tricycle than the domestic car can carry two pet dogs. It is used in Japan for housewives to buy groceries and take their pets out. Roughly, it is a little wider than an adult's shoulder, right? There are purely human power, there are electric assisted, note that is assisted, you do not ride, the electric motor does not turn, very safe, which is the standard requirements of Japan and Europe.
Purely human power, the good one is the double flywheel.
There are smuggled ones, and I've seen many of them, ranging in price from a salvaged 600 RMB a piece to a relatively new 3,000 RMB a piece, to 5,000 RMB a piece for the assisted ones.
Because transportation takes up several times the space of a regular bike, the average person doesn't traffic in them.
Please contact Shanghai Xunlei Vehicle Company directly, they have produced for export to Japan and have domestic sales.
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Types of chargers
Today's Ph.D. also does not understand the magnetic discharge large-scale, this is a silicon steel sheet iron core, coil, AC power supply, DC power supply, related to the magnetic saturation electromagnetic system, electromagnetic system of magnetic leakage, is the traditional structure, in the 1970's before the Popular, the former Soviet Union in this regard, the most solid basic theoretical work in that year's military equipment, aerospace, aviation equipment have applications, the liberation war period of the captured U.S. Army charger, there is this type, and with selenium rectifiers, China in the railroad system more than 30 years ago, the train on-board charge controllers are of this type, and its principle of operation, a simple understanding of, it is similar to the thyristor phase control mode and the Ordinary welding machine leakage effect. Related to the vibrator modulation current conversion mode, AC motor - DC generator and excitation regulation system. Basically, it is a parametric class of predominantly electromechanical devices.
Phase control type, it is from 1970 in the domestic popular silicon controlled circuit, in fact, before the Cultural Revolution, in electrolysis, aluminum electrolysis, electroplating, trams, radio transmitters and so on in the field of popular mercury, mercury control tubes, a kind of gas discharge devices, is similar to the principle of operation, and its overload capacity exceeds the early silicon controlled devices.
High-frequency switching type, that is, characterized by high-frequency electronic saturation - cut-off switching, the earliest in the private sector is the power supply for imported televisions, the domestic application from 1972 onwards, the right to be considered as integrated circuits and high-power semiconductor device development products. Can also be regarded as vibronic modulation of variable current mode of switching frequency increased by several orders of magnitude only.
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How does a power wheelchair turn?
Safe, standard way to use a differential, is recognized in Europe and the United States in the nature of the reliable and safe way to steer with another pair of wheel systems, domestic exports of high-grade wheelchairs to Europe and the United States on the use of domestic differential, a wheelchair with a domestic differential price of about 500 yuan or more, 2,000 yuan or less, there are many specifications.
The simple method is an independent motor drive , each motor rotation speed, torque is different, on the steering, low reliability, low cost, light weight, belongs to the open-loop control, if you join the medium precision **** closed-loop control, the cost is much higher than the use of differentials.
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Kneeling for bicycle ball bearing, there is no bicycle ball bearing to buy ah!
Bicycle parts are a huge business with huge sales, there are many manufacturers and wholesale outlets all over the country, and there must be one in your local area as well, just pay attention, there are people at all the local bike repair stores who make regular deliveries, and following the trail is just the way to go. And in 40 years ago, there will be industrial bearings in the country - ordinary single-row radial bearings instead of ordinary bicycle deep groove bearings, without the need for machine tool processing, can be directly interchanged, with roughly similar tolerances, in the bicycle parts quality is not high nowadays, for now a lot of long-distance transportation, heavy-duty bicycle modification of the customary practice.
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The ground bike is good or curved handlebar bike ah good ah
In 40 years ago, foreign brand-name bicycles in a suitable for ladies riding a bicycle, curved beam, the body of the front part of the body heightened, and handlebar is the normal length of the long length of a lady riding posture is upright, the grooming is very beautiful, the lady riding posture is very beautiful. This is not just raise the front end and can replace, the front handlebar is high, is through the front of the frame to raise and produce a coordinated sense of beauty. You can't see it anymore. It is now popular to smuggle Japanese bicycles, Japanese car steel is good, deep groove bearing friction resistance is small, especially in the big driving force is particularly smooth, riding is very light, basically no maintenance. Generally 300 yuan to 500 yuan yuan a bar, individual rare styles and particularly good structure can be 1000 to 6000 yuan a, that are men's. The first one is the one that is smuggled in from the south of the country. They are all smuggled in from the south, you can receive by freight shipping. Japanese car in a unique big bend handle, high head horse structure, you can see from the Japanese film and television works, I have three Japanese bicycles, their own are replaced with a big bend handle, about 60 yuan yuan a set of it, this is the wholesale price, the general public can not buy, to the whole car 350 yuan to 450 yuan to sell.
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Electric bicycle speed principle
There are three kinds of
Changing the size of the drive current of the brushed motor to adjust the speed, change the brushless multi-phase motor of the phases to adjust the speed
Changing the speed of the mechanical device, with the external gearbox, the internal transmission
Foreign countries also have automatic speed change, is through the detection of the movement cycle of the spokes, under the energy of the No. 5 battery, through the diameter of 2 centimeters of the small motor to change the mechanical speed change ratio.