Which is faster than an 18 speed mountain bike or a 12 speed road bike?

Other conditions are constant, only compared to the car, depending on the gear ratio. The largest set of gear ratios determines the maximum speed, and the larger the gear ratio, the faster the speed.

Mountain bikes have more gear ratios, but compared to road bikes, most of them have added gear with small gear ratios, which does not help the fastest speed.

The larger the crankset of the pedal, the smaller the cassette behind it, and the faster the speed.

With the same gear ratio, road wheels have larger diameters, less tread resistance, and faster speeds.

The 18-speed mountain bike has 3 front and 6 rear, and the 12-speed road bike has 2 front and 6 rear, and the number of teeth is the same.

To say fast or fast road bike is not explained.

Look at the gear ratio, if the engine is the same, it must be fast on the road, mountain bikes focus on passability, the road pursues speed, not the more gears, the faster, but the slower the shifting response, the real veterans are looking for fast and precise shifting, not with a heavyweight gear (usually many gears are not used, unless you are a high-revving party with a cadence of 90+, I am).

Road bikes are fast and have different gear teeth.

It depends on the engine and road conditions.

Mine is a 12-speed highway, the downhill is very cool, and the larger slope is very depressing, especially climbing Wutong Mountain, which is a big S plus a small S, before going up.

18-speed, there are 3 gears in front and 6 in the rear, 3 6 is the 1812 speed, there are 3 in front of the gear, only 4 in the rear, 4 3 is the choice of 6 gears more than the 1218 speed than the 12-speed.

Of course, 18 speed is fast.

Mountain bikesThe advantage of the 12-speed and 30-speed is that it is cost-effective, and the disadvantage is the poor operating system. A 36-speed is a 12-speed. It's just that the gears are different, one has 36 gears variable, the other has 12 gears variable, and the number of gears depends on the number of crankset pieces.

The number of pieces of the flywheel determines the speed level of the transmission system.

12 pieces is 12 speeds (6 pieces are 6 speeds, the same goes for everything else), and then look at the crankset. The 1-piece crankset is 1x12-speed (and 1xx11 are both "1x single-disc variable speed system"). The 2-blade crankset is 2x12-speed, and the 3x12-speed is the so-called "36-speed" (which is actually a wrong statement and can be easily misunderstood).

Note: Although there are many types of vehicles, the structure is similar. This should be said to be the credit of standardization, but also the need for large-scale production lines.

With the development of society, the progress of science and technology and the change of demand, the shape of railway vehicles has begun to change, especially the passenger car is no longer the same old face. However, their basic structure has not changed significantly, but the specific parts have a more scientific and advanced structural design.

Generally speaking, the basic structure of the vehicle is composed of five parts: the car body, the undercarriage, the running part, the coupler buffer device and the braking device.

The body is the part of the vehicle that is used to load goods or passengers, and is the basis for the installation and connection of other components of the vehicle. The body of the early vehicles was mainly made of wood, supplemented by steel plates, bow rods, etc. In modern times, the car body is mainly steel structure or light metal structure.

Summary. Hello, friend. Mountain bike 12 speeds, depending on the two types of flywheels, which one it is.

One, six-speed flywheel mountain bike, front ** two speeds, 2, 6 equals 12 speeds, front ** with rear flywheel 4, 5, 6, speed, front small disc with rear flywheel 1, 2, 3, 4 speed.

Second, the high-end mountain bike is 12 speeds, the front ** is a platter, and the rear flywheel is 12 speeds. The maximum flywheel can reach more than 42t, which is larger than the previous **. The front ** may be 36t.

Why the premium mountain bike is 12-speed.

Hello, friend. The twelve speeds of the mountain bike depend on the two Hu species of the flying blind song wheel, which kind of grinding Zheng. One, six-speed flywheel mountain bike, front ** two speeds, 2, 6 equals 12 speeds, front ** with rear flywheel 4, 5, 6, speed, front small disc with rear flywheel 1, 2, 3, 4 speed.

Second, the high-end mountain bike is 12 speeds, the front ** is a platter, and the rear flywheel is 12 speeds. The maximum flywheel can reach more than 42t, which is larger than the previous **. The front ** may be 36t.

12-speed mountain bike refers to, there is only one front chainring, 12 rear flywheels, so it is called 12 speed, this product is characterized by strong climbing ability, the disadvantage is that when riding on a smooth road, the speed can not be raised, of course, it depends on who rides, if it is a veteran, then there is no slow problem, in addition to arguing that it is not a little white, of course, for the average person to ride a bicycle is for exercise, not for the competition, as long as it is suitable for themselves, it doesn't matter if it is fast or slow.

If it is the same brand of mountain bike, the same brand of transmission, 21-speed and 24-speed without considering other configurations, the main differences are as follows:

The first is whether the shifting is flexible. You may not feel it on a normal road, but you can feel it when you step on an uphill road.

Second, there is a difference between the 21-speed and the 24-speed finger pluck and model. The more advanced the better, and the more reasonable the design.

In ordinary use, especially on urban roads, both transmissions are about the same, nothing is noticeable. If you're on a mountain trail and have a lot of uphill climbs, the 24-speed transmission has a clear advantage.

No, although they are both 21-speed, mountain bikes have smaller tooth pals than road bikes, and the flywheel is larger than road bikes, even though mountain bikes and road bikes pedal as often as they are ridden, while road bikes are much faster than mountain bikes.

Even if the gear ratio is the same and the cadence is the same, the speed should not be the same.

One is because the rough resistance of mountain bike tires is large, and the other is because the tire diameters of the two cars are different.

30 speed good.

Mountain biking.

The cycling distance of the race is 40-50 km. Among them, the gentle road section shall not exceed 15%, and the rest shall be uneven road sections. The route usually consists of high-speed downhill sections, mountain climbing sections, country roads, and gravel sections.

Sections, forest sections and short asphalt sections.

There are signs every 1 kilometre on the course indicating the number of kilometres to the finish line. The road sign is 20 cm wide and 40 cm long, and is placed at a distance of one meter from the ground. Road signage should accurately indicate the race route and subsequent changes in road conditions, as well as intersections and all potentially dangerous areas.

The start of the start must be open enough for the rider to start safely. The front and back of the finish line should have long enough straights and open vision to provide safety for the finish sprint and the buffer after the sprint. Because mountain bikes are more strenuous to drive, the frame of a mountain bike should be correspondingly smaller than that of a regular bike.

This construction is built with the bike off-road in mind.

The characteristics of the movement, on different grounds, the bicycle is more convenient to operate.

The material, construction, and design of the frame are important to creating an efficient, safe, and reliable bicycle that needs to withstand shocks caused by a variety of reasons.

The standard handlebar is flat with an extended handshake. The vertical handlebar, also known as the cockbar, ensures that the rider maintains a comfortable posture during riding. The length or height of the handlebar riser can be adjusted, and the extension increases the distance between the handlebar and the saddle.

Both 7-speed bikes and 21-speed bikes have their own advantages and disadvantages, if you are a newbie and just normal riding, then a 7-speed bike will be enough, and if you have higher riding requirements, then a 21-speed bike is more suitable for you. In short, when choosing a bicycle, you should choose the most suitable bicycle for yourself according to your actual situation.

First of all, the advantages of the 7-speed bicycle are that it is low, easy to maintain, suitable for novices, and the gear of the 7-speed bicycle is relatively simple, and the gear shift is relatively easy, which can meet the general riding needs.

Secondly, the advantage of the 21-speed bicycle is that there are more gears, which can meet different riding needs, such as mountain off-road, long-distance riding, etc., and the gears of the 21-speed bicycle are relatively fine, which can better meet the needs of riding and be more comfortable.

Precautions for buying a mountain bike:

1. When choosing to buy a mountain bike, you must first understand the main purpose of buying a mountain bike, if it is only used for walking or occasional travel, it is recommended to buy a mid-range mountain bike with about 15 speeds.

Because the higher the speed ratio, the more likely it is that problems will occur, and there are many mountain bikes with a lot of crotch that are simply not used on city streets. On the contrary, if you mainly want to have fun and fitness, experience mountain biking. If you are bold, you can consider buying a model with 18 speeds or higher, and you can fully experience the fun brought by the speed ratio.

2. When purchasing a mountain bike, if it is a vehicle purchase, we must pay attention to whether the vehicle assembly is harmonious, whether the conversion of each gear of the transmission is smooth, whether the welding joints of each welding port are smooth, whether there is no sand hole, and whether the spare parts are complete.

If you unpack and assemble in the shopping mall, it depends on the technology of the assembly workers, and the level of assembly has a great impact on the performance of the whole vehicle. If possible, skilled assemblers should be selected for on-site assembly.

3. Mountain bikes are actually mainly used for sports and fitness, and are not suitable as a daily means of transportation, because the mountain bike saddle is smaller, hard and high, while the handlebar is low, and the riding posture is low in front and high in the back.

According to Mr. Zhang, the doctor of the bicycle training team of the National Sports Commission, teenagers should not ride mountain bikes to and from class for a long time, otherwise it will affect the normal development of the spine. <>