In a road bike race, why is the front wheel spoked and the rear wheel a whole piece?

After the wheel rotates to reach a certain speed, the total air resistance generated by each strip is relatively large, and this resistance can be greatly reduced after being made into a spoke. The reason why the front spokes and rear wheels are integrated is because the rear wheels have to bear the torque from the rider's afterburner, which is very large, and this force comes from two directions, one is the rider's pedaling force, and the other is the lateral torque of the rear wheel when the rider "swings the car". Therefore, in the single-engine design, in order to improve the rigidity of the wheels, the rear wheels are made of an integrated type with greater strength than the spoke wheels, and this will definitely increase the weight, so the front wheels that do not have to bear so much force are made into a spoke type that only reduces air resistance.

This is also the case in triathlon racing, with strip and front-and-rear spoked wheels, while track road racing uses front-to-rear spokes and front-spoke rear integration.

The reason why the front wheel is a spoke is not very clear, why the rear wheel is a whole I just saw a report about the science and technology Olympics at noon today, saying that the bicycle is riding at high speed, each spoke of the tire will produce a vortex, and the vortex generated by the wheel of many spokes is greater, bringing greater resistance, if it is designed as spokes, the riding feeling will be very much like a big egg stirr, so it is designed as an integrated wheel.

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Bikes with a lot of spokes have better shock absorption, and one-wheel bikes have some advantages in speed.

The shape is different, the material of the integrated wheel is mainly made of magnesium alloy or carbon fiber material, and the types of key are three knife wheels, four knife wheels, and five knife wheels. The five-knife wheel is the most commonly used one-piece wheel, which is very beautiful and colorful, which is in line with the current trend of young friends. It is more suitable for the definition of modern urban light riding.

The spoke wheel is mainly made of carbon fiber material, and the spoke wheel has multiple spokes because it is connected to steel wire.

The characteristics are not the same.

The one-piece wheel is heavier than the spoked wheel, and the inertia force of the wheel is beneficial for riding fast, and is used to seek speed on the ground smoothly. It is a certain molding structure feature, there is no electric welding welding joint, the characteristics are more stable, overweight or often riding on shaking ground is not easy to weld, no deformation or interference. Spoked wheels are more suitable for mountain biking, and the first 10 kilometers are likely to be tougher.

The rear cushioning is very good and saves effort. Spoke wheels are durable and can be adjusted back after being deformed. In general, the wheel is regarded as the oldest and most important invention of people, and it is often even generalized with the application of fire.

In fact, people have tamed fire for more than 1.5 million years, and the wheel has only been used for a small 6,000 years.

Obviously, the meaning of the title is that the spokes of the bicycle can be clearly seen.

It is possible to break down the movement of the wheel into translational and angular velocity to the left (for riders).

It can be seen that at each moment, the speed at the top of the wheel is twice the speed at the center. And the bottom velocity is 0

So the following is clear.

3 The lower half is clearer than the upper half.

It's not clear, the road bike is fast, and people's eyes can't distinguish it at all.

The lower half is clearer than the upper half.

Explained by the speed relative to the ground.

The velocity of the upper half relative to the ground is large, and the velocity of the lower half relative to the ground is small, so it is clear.

The velocity of the bottom of the wheel relative to the ground is 0, so you can see it clearly.

Velocity relative to the ground. The fulcrum is where the bottom of the tire meets the ground. Draw a diagram where you connect the lowest and highest points.

When the bicycle is in motion, the whole car has a forward speed, which is denoted as v1;

At the same time, due to the rotation of the wheel, each point on the wheel has a "linear velocity", where the wheel and the ground are in contact, the direction of this "linear velocity" is backwards, which is recorded as v2, so v1 and v2 cancel each other, and the speed is relatively small. That is, the lower the place, the less the speed. In the upper part of the wheel, V2 is in the same direction as V1, so the higher you go, the higher the speed.

Where the speed is small, it looks clearer, so the lower part of the wheel is clear.

The strips of objects in the wheels of a bicycle are called spokes, commonly known as strips. It plays the role of connecting the hub and the rim.

Usually there will be 28 and 36 strips per wheel. The smaller the number of strips with the same parts, the lighter the wheelset and the lower the strength. The greater the number of strips, the higher the quality of the wheels, and the higher the strength of the car.

If the wheel does not use a strip, the use of a hail body structure will be very heavy, and the elasticity of the integrated structure is poor. After changing to a car bar, the mass can be greatly reduced, and the wheel group of the vertical car bar can be elastic well, and it can better absorb the vibration of the road surface.

1.This is a matter of taking the reference frame, in fact, from the ground, that is, using the ground as the reference frame, the upper end of the wheel's speed is inconsistent with the lower end of the friendship, and the lower end (the point that contacts with the ground) has zero velocity, which is called the speed instantaneous, and the upper end has velocity. 2.

If you're riding a bicycle in the same direction at the same speed, and you look at the wheel of another bicycle, it's the same as when you're riding on a bicycle, and you're using the bicycle as a reference frame, and then the speed is the same relative to your upper and lower ends, and it's the same as when you put your bicycle there and people pedal on it, but the wheels are spinning.