How do I change the speed of a children s variable speed bike?

Left finger dial: thumb push upper: the more you push, the heavier it gets, and the index finger hook backstop: the more you hook, the lighter it is.

Right finger dial: thumb upset: the more you push, the lighter it gets, and the index finger hook backshift: the more you hook, the heavier it gets.

Basic operation: Generally speaking, the first 2 gears are equipped with the rear 4,5, 6th gear is the most comfortable!

Leisure point: 1 in the front and 3, 4 and 5 in the rear.

Out speed: front 3 rear 6,7 gears.

Note: Don't use the first 3rd gear and the last 7th gear too often!

Reason: 1. I am tired.

2. The first 3 gears are easy to deform with more pressure plates.

3. With 3 with 7 labor, the knee is stressed too much for a long time, and it will be very painful!

1 with 1 or 3 with 7 are unreasonable new cars will have the sound of grinding chains, which is normal, because these two gears are unscientific, and the two points are not in a straight line!

Remember that the transmission is changing speed in operation, do not toggle the transmission when stopping, otherwise it will not be able to enter the middle gear again, and the transmission will be greatly damaged by a line of progress!

That's simple, because there are several large and small wheels at the rear wheel, and the linear velocity v on the chain is equal everywhere, while the angular velocity w on the rear wheel is different. According to w=v r, v is constant, when the rear rotation is smaller, that is, r becomes smaller, then v does not change, w becomes larger, that is, the circle of the rear rotation increases in the same time. n represents the number of laps, and s=2* shows that s has increased in the same time.

So the speed of the car is faster. This is purely a high school physics question.

At present, the mainstream speed change method refers to dial, turn or beam change.

The dial is generally used to push or pull the speed knob with one or two fingers to change speeds.

To turn the handle is to hold the handle with your hand and twist it.

Beam transformers are generally used on low-end road bikes, and require the hand to leave the handlebar for shifting gear (the first two types do not leave the handlebar).

The speed must be changed during the ride, and when the bike doesn't move, whatever you want to pull it is useless.

Children's bikes do not need to be shifted.

This does not require a speed change, because it is a child buried children's bicycle, children can ride safely, and the speed change is not suitable for children.

Cycling sports, faster speed, higher safety requirements. Parents must pay attention to equipping their children with professional cycling protective equipment and finding suitable venues for cycling.

Introduction to Children's Bicycles:

A children's bicycle is a bicycle that is suitable for children aged 4-8 years old, with a maximum saddle height of 435mm 635mm, and rides with a driving mechanism acting on the rear wheels. There are various wheel diameters and styles with or without balance wheels. Children's bikes cannot be used for road riding.

If the size is too large, the child will not be able to hold the hand brake tightly when braking, and the car will not be able to brake. So it's best to take your children with you to give it a try. In addition, the braking force shall not be less than 50N. Otherwise, the vehicle will not be able to brake, which will bring harm to children.

Some children's bicycles are also equipped with protective wheels (balance wheels), which can keep the rider balanced, so pay attention to whether it is complete when purchasing (one on the left and one on the left and right), and do not dismantle it at will when using, and parents must consider this when purchasing and using. In 1980, there were children's pedal bicycles with 2 wheels behind the back of the training wheels, and at that time, there were just children's pedal bicycles, but it was not common. Arguments.

It can be adjusted using the following method of late stateVariable speed bikesTransmission.

1. When the vehicle is going uphill, first adjust the left side to 1st gear.

2. Adjust to 1st gear on the right. If you find it strained, you can continue to adjust it up to 2nd or 3rd gear.

3. On the flat road, the left side can be adjusted to 5, 6, and 7 gears.

4. When going downhill, there are three gears on the left, and 5, 6, and 7 gears on the right can be used.

The role of the transmission.

When riding on normal roads, the front chainring (operated by the gear lever on the left) is fixed in the middle (or maximum chainring 1). Using only the rear chainring (operated by the gear lever on the right) is easier to understand. The smallest front chainring is used when going uphill.

How to choose the gear ratio of the rear chainring? This is determined by the number of rotations of the pedal: the number of rotations of the front chainring (central axis) for 1 minute. What is the right number of rotations for Xinfan?

It should be different according to the strength of the feet, skills, and cardiopulmonary function. Generally 70 80rpm, 2 is more suitable.

1. When you want to speed up, start with a lower chainring (the larger chainring at the back), and change to a higher gear (small chainring at the back) as the speed increases.

2. The speed will be reduced when going uphill, and the gear ratio will be reduced to maintain a certain pedaling strength.

3. When downwind, the speed will be accelerated, and the gear ratio will be increased to maintain a certain pedaling strength.

Mountain bikingTransmission adjustment steps:

Mountain bike. There are many types of transmissions such as 3 6, 3 7, 3 8, 3 9, etc., if your car needs only disturb the town is the morning socks and evening commuting, buy 7 is enough, if you are mainly used for long-distance riding or professional racing, it is recommended to 3 8, 3 9 or even up.

If the front crankset is 1st gear, the rear flywheel is best used with 12345 gear, if the front is 2nd gear, the rear is best used with 234567 gear, if the front is 3rd gear, the rear is best equipped with 789 gear.

The chain should be kept parallel to the body as much as possible, even if it is not parallel, the angle of the cross is as small as possible, otherwise it will accelerate the wear of the chain, and even the slippery silk, the car will not be able to ride, and the chain must be broken by hand to the gear to be stuck, in order to continue to ride, the chain is very dirty, very troublesome, and not easy to break, so it is necessary to observe the chain angle at any time.

Hello. The first step is to adjust the left side of the vehicle to first gear when going uphill, and the second step is to adjust to 2nd or 3rd gear when you feel comfortable and laborious when you step on it.

In the third step, when the road is flat, you can know that the left side of the degree can be adjusted to 5, 6, and 7 gears.

Fourth, when going downhill, you can adjust the left side to 3rd gear, or you can adjust it according to your preference.

Shift speed before going uphill: When riding a mountain bike and need to change speed when you encounter an uphill slope, you must have a good foresight, don't wait until you ride on the slope and then change the speed (slow down), be sure to change the speed before going uphill, so you need to ensure the speed and stepping speed when going uphill, and it is not easy to damage your knees. Flat road to lead gap speed:

Remember to tread evenly when shifting, don't change gears (accelerate) when accelerating sharply, sometimes the transmission can't be geared up smoothly, then you can push the shift handle a little bit until the gear is in place. In special cases, if the gear cannot be in place when decelerating uphill, slow down the step a little, and you can generally change the speed smoothly.

If the speed of the mountain bike is regular, it is necessary to follow the principle of "big in front and small in the back, small in front and big in the back". Strip Lai Piercing Head.

1.The front 3 and the rear 7 of the flat road are the fastest (the crankset is the largest, the flywheel is the smallest), and the first 2 rear and the gear are usually more suitable for riding speed in the city. Lai Yan headlines.

2.Uphill front 1 after 1 most labor-saving (crankset is the smallest, flywheel is the largest), usually the front 1 rear gear climb is more suitable than the rest of the search. Strip Lai Piercing Head.

3.3 before and after downhill, can be (according to the situation of speed change, downhill crankset can not be on the small chainring, flywheel can not be on the large chainring, in order to avoid the danger of kicking) Generally, the left front drapillator vertical delay calendar right rear derailleur, the larger the value on the transmission, the higher the speed ratio, that is to say, the larger the value of the left hand, the larger the gear of the crankset, the larger the value of the right hand, the smaller the Dan travel gear of the flywheel, at this time, the front is large and the back is small, the speed is the fastest, and the reverse is the most labor-saving. Note:

Don't change the front and rear transmissions at the same time, it will be bad for the transmission, and don't change the speed after stopping, make sure that the rear wheel turns before changing the speed, otherwise it will also hurt the transmission. The front is large and the back is small, and the front is small and the back is larger, but the pedaling frequency is higher, and it will be very laborious for a long time. The correct way to change gears is:

The flywheel (that is, the rear disk) starts at the time of the **, and changes to the small disk as the speed accelerates, which is both labor-saving and fast. If the crankset (that is, the front disk) is a three-piece type, the rear disk can not be hung into the most ** when the front disk is hung into the most **, on the contrary, when the current disk is hung into the smallest disk, the rear disk can not be hung into the smallest disk, and the front disk is in the middle of the disk when the rear disk is arbitrary. When using the flat road, the front is large and the back is small, if the front is small, the back will be very tired and slow; When going uphill, use the front small and the back large, because the front is large and the back is small, not only will it be tired, but it will not be able to pedal when encountering a steep slope, and at the same time increase the burden on the transmission system.

In general, the downhill should be large in front and small in the back.

No.

If you just let the child ride around your home and have fun, then there is no need to buy a variable gear; But if it's going to be used for going to school or going to a farther place, there's a gearing bike.

It's still quick and easy for children, and it makes it less strenuous for the little ones to ride.

In addition, if the child is too young, do not let him ride a transmission bicycle, after all, for children who are too young, the transmission car is still difficult to control, and it is prone to danger.

Precautions for cycling.

Don't ride on "bike-no-no" sections, such as sidewalks and elevated expressways.

As well as trees with bicycle prohibition signs.

The number of road groups. When riding on the highway, don't compete with the car, don't run red lights, and don't drive in the wrong direction.

The time and distance of a ride should not be too long, the intensity of exercise should not be too large, and it should be determined according to the season and physical condition, and it is not suitable to travel far in summer and winter.

Hang one gear in front and five, six, seven and eight gears in the back; Hang two gears in front and two three, four, five, six, seven and eight in the back; Hang three gears in front and one, two, and three gears in the back.

1. First of all, we need to briefly get to know the bicycle. The left handle of the bike is the front shift control center, and the right handle is the rear shift control center. There are buttons on the handlebar to adjust the gears.

Gears can also be displayed on the handlebar.

Shifting tips for cycling :

1. First of all, we need to briefly get to know the bicycle. The left handlebar of the bike is the front shift control center, and the right handle is the rear shift control center. There are buttons on the handlebar to adjust the gear, and the gear can also be displayed on the handlebar.

2. The gears of the front gear from top to bottom are high-end (3 gears), middle gears (2 gears), and low gears (1 gear). The rear gears are from bottom to top from low to high (from 1st to 7th). Generally speaking, the higher the gear, the faster and the harder it is to pedal.

The lower the gear, the slower and easier it is to pedal.

3. When we ride on the uphill road, in order to save effort, we should adjust the front gear to 1 gear, the rear gear to the gear (the rear gear can be adjusted according to their actual situation and the size of the slope).

4. When we ride on a flat road, we should adjust the front gear to 2nd gear and the rear gear to 4th gear. Of course, the rear gear can be adjusted according to your actual situation, and the gear can be adjusted.

5. When we are driving on a downhill road, we should adjust the front gear to 3rd gear and the rear gear to the gear position.

6. When riding on the downhill road, since the front and rear gears have been adjusted to the highest gear, we should strictly control the speed to avoid traffic accidents.