What are the aspects to look at when buying a variable speed bike?

Regarding the chassis of the vehicle, everyone often neglects to verify it because of the trouble. However, the importance of the chassis is like the human skeleton, and any damage may shorten the life of a car. In addition, the chassis has a great influence on the tension and resistance of the vehicle architecture, which is the second major focus after the engine inspection.

Therefore, you should not be cautious when purchasing.

Because the chassis is not easy to replace when damaged, it is often only simple for car repairers to make repairs, so as long as you use a snack, you will be able to find a clue. There are several ways to start identifying the chassis of a used car:

1 Open the hood and look at the two girders of the car, one is not easy to find under the battery, and the other is easy to observe on the left side, check it for signs of welding or cracking, because if there is a rear-end collision or side impact, the frame will be crushed and bent or cracked, and it needs to be welded if it is to be repaired.

2. Check whether there is oil leakage in the engine oil pan, gearbox, differential, brake system, transfer case, and shock absorber.

3. Turn over the carpet in the car, because if it is a "soaking car", no matter how you clean it, there will be traces left, turn over the trunk carpet to see if there are any traces of welding, because if there is a rear-end collision, welding is required for maintenance.

4. Check the suspension system, press the 4 corners of the body hard, observe whether the reaction force is average, and be sure to pay attention to: whether there is an abnormal sound when pressing the body hard, and whether the tire will have the sound of "gnawing the tire".

5 Check the exhaust pipe for oil leakage or rot.

6 The wear and tear of the tires can reflect the frequency of use of the car, especially the front wheels, if the pattern is flat and the edges are not edged and cornered, it means that the car is used more frequently.

Also, if possible, find someone to follow the car and see if it is snakeing while driving. If the above situation occurs, you should choose carefully.

Frame: light weight, high structural strength.

Transmission system: responsive, high precision, light weight, sturdy and excellent.

Wheels: high lubrication, light weight, strong and excellent.

Don't worry, a shifter bike is not very squeamish, even if you buy a 3-4 hundred yuan, you can ride it for 4-5 years, which is nothing new. Of course, if you play some stunts with him, it will be bad in a few days. Since it is not very convenient for you to repair the car, let him debug some of them when you buy them, especially the transmission, to see if every gear can be changed and whether there is any abnormal sound when riding.

The rest is nothing, usually care about it, don't let the car be too dirty, and if there is anything loose, you can tighten it yourself. After a long time, the chain may sizzle, just add some oil.

The body should be light and the transmission should be sensitive.

Try it when you buy it to see if you can change gears well during the ride.

The bicycle is good for changing gears.

A shifter bike is a type of racing car with narrow wheels in order to minimize the weight of the vehicle and make the ride light and high-speed. The function of the bicycle transmission system is to change the speed of the bicycle by changing the coordination of the chain and the gear discs of different front and rear sizes.

The size of the front chainring and the size of the rear chainring determine how hard the bike rotates the pedals. The larger the front chainring, the smaller the rear chainring, and the more laborious it is when pedaling. The smaller the front chainring and the larger the rear chainring, the more relaxed it is when pedaling.

Principle:

When the variable speed bicycle stops pedaling, 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, and the flywheel internal teeth produce relative sliding, thereby compressing the core into the notch of the core, and the jack compresses the jack spring. When the jack tooth top slides to the top of the flywheel's inner teeth, the jack spring is compressed the most.

Slip forward a little more, and the jack is bounced to the root of the tooth by the jack spring, making a "click" sound. The core rotated faster, and the jacks quickly slid on the inner teeth of each flywheel, making a "click" sound.

When the pedal is reversed, the jacket rotates in reverse, which will accelerate the sliding of the jack, making the "click" sound more urgent. The multi-stage cassette is an important part of the bicycle transmission.

The above content refers to Encyclopedia - Variable Speed Bike.