This is hard to say, Baidu thought I was advertising for a while

Then again, of course Guidi is better

I will introduce it below Here are some tips for purchasing electric bicycles

1. Classification of electric bicycles

Electric bicycles are generally divided into two categories. One is "zero-start electric bicycles" , generally called electric bicycles, this kind of electric bicycle can be ridden entirely on electric power although it has a pedal riding function. There is also a kind of "intelligent electric bicycle". This kind of intelligent electric bicycle cannot be completely electric. It is a power-assisted electric bicycle that requires human power to ride. Generally, it is a one-to-one assist, that is, the human and machine contribute equally. Electric bicycles are products with Chinese characteristics and have completely independent intellectual property rights. They have attracted close attention from foreign dealers and have imported them from my country.

2. Key points for purchasing

1. Easy to ride, light and effortless to ride.

2. Stable quality, safe and reliable.

3. The size should adapt to your body.

4. Style, color and price.

5. Each fastening screw and nut should be tightened and shall not loosen or fall off.

6. Each rotating part should operate flexibly and should not be stuck or stiff. For example: when the wheel is lifted, the front and rear wheels should rotate flexibly, and there should be no large left and right swings and up and down jumps. When the wheel is about to stop when the wheel is lifted, the wheels should be able to swing forward and backward briskly, and should not stop rotating suddenly. The handlebar should be able to rotate left and right flexibly, and the pedal shaft and crank should be tight, not loose from each other, and rotate flexibly.

7. Transmission device: The transmission vehicle should have the correct gear within the transmission range, the transmission position should be clear, and there should be no gap in the middle.

8. The chain should be appropriately tight and flexible in operation. Turn the crank sprocket forward and backward repeatedly by hand. The chain will run flexibly and there should be no chain skipping or falling off.

9. Saddle parts: Hold the front and rear parts of the saddle with both hands, and press down the front end of the saddle with one hand. The front end of the saddle must not collapse. Then use both hands to turn the saddle horizontally, and the saddle should not turn.

10. Selection of brakes and braking systems: Hold the handlebars with both hands, brake left and right while pushing and pulling the bicycle forward and backward. The wheels should not rotate at this time; release the handle and the braking system should be able to reset quickly.

11. Appearance: The surface of each component should be clean, without stains or rust, and the trademark decals should be complete and clear, without sharp edges and burrs, such as whether there is a scratchy feeling on the edges of the mud plate and chain cover, etc. Whether the ends of brake and other steel ropes are equipped with protective sleeves, etc.

12. Observe the grade or label of the parts. Generally speaking, good parts are marked with obvious trademark marks and the patterns are clear and beautiful.

13. The switches in each part are sensitive and reliable.

14. Speed ??regulation is stable and reliable. Turn the speed control handle slowly, and the motor should start smoothly and accelerate without abnormal noise. After releasing the handle, the handle can be reset quickly and the motor decelerates evenly.

15. The brake power off is quick and reliable. Turn the speed control handle, and after the motor is running and the brake is pressed, the motor can immediately cut off power. If there is a power display, you can see that the voltage display returns to zero.

16. The battery is easy to disassemble and assemble. Lead-acid batteries generally weigh 13.5kg and are disassembled and assembled every day, so the location of the battery must be suitable for your body shape. In addition, when carrying the battery, do not touch the battery contacts with your hands or metal objects such as keys to avoid the risk of short circuit.

3. How to use and maintain

Please read the manual carefully to understand the functions of the car, especially the precautions. First of all, pay attention to cleaning. After encountering water, especially salt water in winter (many cities spray salt water after heavy snowfall in winter to avoid freezing), it must be cleaned in time, otherwise it will easily cause metal parts to rust and the paint film to age and fall off. Both the handlebar and the seat are adjustable. When adjusting, firstly, you must make your riding comfortable, and secondly, pay attention to the maximum adjustment height. Both the handlebar riser and saddle tube should be engraved with safety lines, which are generally 2.5 times the diameter of the pipe. This is the maximum adjustment height. The safety lines must not be exposed during adjustment.

After riding a new bike for a period of time, the entire bike should be inspected and adjusted according to the instructions. Tightening and lubrication are essential at this time. Check whether the fasteners are loose and whether the transmission parts are flexible. Pay attention to wiping off the floating oil after lubricating the chain, and just apply a little oil on the flywheel. Tires must be properly inflated, otherwise riding comfort and service life will be affected.

Car brakes are the basic guarantee of safety and should be checked at any time. Whenever any problem is found, it should be adjusted or repaired immediately.

IV. Performance price comparison

1. Sports vehicle: It is the general term for racing sports vehicles, BMX, mountain bikes (MTB), all-terrain vehicles (ATB) and other vehicles. Mainly used for sports training, tourism, urban or rural transportation. The transmission range is wide, including 10, 12, 15, 18, 21 speed and other external transmissions. ***There are double sprockets or triple sprockets with 40-52 teeth, flywheels with 5-7 levels, 13-28 teeth, speed ratio 1.4-4, and stroke 2.8-8.5 meters.

2. BMX (off-road vehicle) is a foreign term with dual meanings: first, the appearance is similar to bicycles and motorcycles; second, it has a solid structure, wide tires, thick tread, and off-road performance. The parts have high strength and strong impact resistance. The wheel diameter is mostly 510 mm (20 inches), and there are also 450 mm (18 inches) specifications. The general tire width is 1.75 inches (45 mm) - 2.215 inches (56 mm). Some are even wider. The speed ratio is generally 2-2.5. Single-stage transmission, stroke 2.6-4 meters. Suitable for sports training, skill training and transportation for teenagers and children.

3. MTB mountain bikes and ATB all-terrain vehicles are new varieties that appeared internationally in the 1980s. It is a combination of a multi-speed sports bike and a BMX bike. The wheel diameters are mostly 660 mm and 610 mm, the tire width is 1.75 inches to 2.215 inches, there are various specifications, and the tires have deep tread patterns. Equipped with 10-21-stage external transmission, speed ratio 0.8-3.4, stroke 1.5-7 meters. Some use aluminum alloy frames, high carbon steel full suspension frames, suspension front forks, V-shaped brakes and other high-strength components to greatly enhance the earthquake and impact resistance of mountain bikes. Mainly suitable for young people's cross-country, travel and sports training. However, it should be noted that mountain bikes are divided into road types and off-road types, and the use environments are different.

5. Racing

Generally divided into road racing and track racing.

1. Road racing cars are mainly used for long-distance races, with a weight of 10 kilograms or less, a wheel diameter of 685 mm, and a height customized according to the height of the athlete. The external transmission has 10-21 speeds and a speed ratio of 2-4.4. Drooping handlebars are usually equipped with tubular tires that combine inner and outer tires. The tires weigh about 200 grams. The front and rear axles and saddle tubes are equipped with quick-release mechanisms for easy disassembly and assembly. The frame is made of alloy steel with unequal wall tubes and also aluminum. Alloy, titanium alloy, carbon fiber frame. Features: light, fast and high strength.

2. Track racing is a competition vehicle on a dedicated bicycle racing car. The appearance is similar to a road racing car, but the structure is simple, without a transmission and brakes, and a dead flywheel (the crank rotates with the wheels during riding and cannot slide). Speed ??ratio 3-4.4, stroke 6.5-9.5. The wheel diameter is 685 mm, with tubular tires, and the vehicle weighs about 8 kg.