What is the best number of speeds for a bike?
Our fathers, in their youth, never dreamed that a bicycle could be multi-speed. Such innovations existed at that time only in the West: in the middle of the twentieth century, a bicycle with stars on the front and rear wheels was designed in Italy by the inventor Tullio Compagnolo.
The number of gears has increased from decade to decade, and today (in some models for cycling) exceeds 10. But does it always mean a lot? To understand how many speeds a bike has better, you need to figure out in which cases they make the cyclist’s life easier, and in what. only complicate.
What are we for
When switching speeds on a bicycle, we shift the chain from sprocket to sprocket and change the cadence, that is, the cadence, taking into account the force required to press them. By varying the gear ratio between the pedals and the wheel, we can change the pressure on the pedals. In order for the energy to be evenly distributed during rotation, we include different gears.
When riding in rural areas, on steep inclines or descents, the cyclist is forced to pedal at high speed. One, two, three times this can be done without risk to health, but constant experiments on the body can lead to serious problems with blood vessels. What can be done? Turn on the lowest speed possible. The bike will go slower, but the load on the muscles and blood vessels will decrease due to the pedaling speed.
On the contrary, when descending, the speed will need to be increased. You have to put in a little more effort, but the bike will accelerate and go smoother. For driving on flat surfaces in the city, average speeds are usually chosen, while the chain is stretched evenly, and the load is distributed between muscle groups.
It turns out that the multi-speed system passes the following tests with dignity:
- climbing steep hills;
- a sharp descent from the hills;
- overcoming high barriers;
- driving on sand, mud, off-road.
Summarizing what has been said, we can summarize: transmissions are necessary to save muscle energy in different parts of the path. That is why the question of the number of speeds directly depends on what bike and on what roads you are going to ride.
It’s all about the stars
The number of stars directly depends on the type of bike. There are usually two leading stars on road bikes and three leading stars on mountain bikes, but there are exceptions. At the same time, there are additional stars: for example, 3 and 7-10 gears are installed on road bikes on the front and rear wheels, respectively. To determine the total number of gears, you need to multiply the number of stars on both wheels. It is easy to determine that the number on modern road bikes ranges from 21 to 30. City bikes are often equipped with five gears in the back and two in the back. Ten speeds will be more than enough for them. Most modern city bikes are equipped with seven starter gears. Do not need a lot of speeds and children’s bicycles.
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In order to change speeds, just turn or pull the switch on the steering wheel. Switches (they are also shifters) are of several types:
- rotational (speeds are switched when the handle is turned);
- lever (on the steering wheel there are special levers for switching speeds);
- gripshift (the handle should be rotated away from you or towards you);
- finger levers (one lever changes the speed to a lower speed, the other to a higher speed).
All these devices cost about the same, the latter were invented recently and will cost you a little more.
Live at full speed
No matter how many speeds you choose, each sprocket has its own service life. Every cyclist can extend the life of a gearshift system, which includes a chain, cassette, gears and pedals. It is enough to remember a few rules.
- Try not to change gears on uphills. Select the first speed for both stars and keep it until the end of the climb.
- After climbing or descending on a smooth surface of the track, remember to return the derailleur to medium speed.
- The speed can only be changed while the pedals are spinning, that is, when the bike is in motion. Otherwise, the chain will wear out quickly.
- The difference between the gears of the chain should not be higher than 4. If you set the maximum speed on one star and the maximum speed on the other, the chain will stretch a lot and the whole system will break.
- Do not forget to take good care of the chain in a timely manner. If the bike is being used in a relatively comfortable environment, the chain can be simply wiped down with a dry cloth and coated with bike chain lubricant. If off-road driving is practiced, before lubricating the chain, it will need to be washed with a special mixture or ordinary kerosene.
Concluding the conversation about the number of speeds, I would like to note that ride comfort is a very, very individual thing. For some, 28 speeds are not enough, but for someone it is pleasant to ride along the paths of the park, without bothering with thoughts about gears. Walking, cycling, commuting or cycling professional. it all depends on your goals.
What speed can you develop on a bike??
What speed can you develop on a bike??
A bicycle is a two-wheeled vehicle, and each vehicle has its own speed. Often asked what speed can you develop on a bike? To answer this question, you need to understand that there is an average and maximum speed of movement. Average speed is the speed that is calculated based on the sum of all speeds divided by the number of speed marks. (Suppose you were moving from point A to point B, on the way you have ups and downs, it is clear that the speed will be different during the ascent and descent. In total, your speedometer recorded 5 speed marks 30 km, 20 km, 25 km, 40 km, 10 km, respectively, you need to add up all the speeds 3020254010 = 125 and divide by the number of speed marks, we have 5 of them, we divide 125 by 5 we get an average speed of 25 km per hour). Maximum speed is the highest point recorded when driving from point A to point B, in our example it is 40 km.
If we talk about the average speed of an ordinary cyclist. an amateur, it will be equal to 18-22 km / h, of course there are many factors that affect this indicator, such as wind direction and speed, road surface conditions, surface relief, distances, etc. also a lot depends on the physical fitness of the cyclist and of course on the bike.
Professional athletes can drive at an average speed of over 50 km / h, and over 100 km / h when descending.
Cycling speed records.
As for the maximum speed, there are official records. At the moment, the maximum speed reached on a bicycle is 268 km / h., Fred Rompelberg set this record in 1995, then he was 50 years old. Of course, his bike was specially designed to achieve this speed, he moved behind the sports car to which the dome was attached, but so far no one has broken this record.
One of the first who officially decided to set the speed record on a bicycle was a certain Charles M. Murphy on June 30, 1899, he trained for two whole months before that day. As a result, he developed a speed of 100.2 km / h, he was driving on the railway in Long Island behind a train, to which a dome was also attached.
The next record belongs to Albert Marche, who in 1937 is located in Los Angeles, California. He moved not behind the train, but behind the car, which was equipped with a fabric frame so that the cyclist was inside it. Then he developed a top speed of 139 km / h.
And in 1942 a new record was set, also in California. In this case, the car was a racing car, and the drive sprocket on the bike was so large that it almost touched the ground. Alf Letourne, driving behind a racing car, was able to reach a speed of 175 km / h.
There are also other speed records set on a bicycle.
French rider Eric Baron, set a record descending from the slopes of the volcano for this he used a mountain bike. The speed was 130 km / h.
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Well, the world speed record for downhill cycling belongs to the Frenchman Christian Tylerfer. He descended from the ski base on a special bike, which was equipped in such a way that the force of air resistance was greatly reduced. He also had a fully fitted suit. In this case, a speed of 212 km / h was reached.
In order to measure the speed of a bicycle, there are many possibilities and bicycle speedometers and applications for smartphones. The main thing is to be careful on the roads.
Modern bicycles can have a maximum number of speeds of up to 30. The number of speeds depends on the number of front and rear sprockets. A speed switch on a bike is essential for a comfortable ride on rough terrain. For example, when driving on a hill, you should switch the speed to lower gears, and go down a hill in a higher gear. By switching speeds when necessary, the cyclist saves energy.
Optimal gear shifting
In order to avoid skewing and skipping of the chain, it is recommended to change gears as follows: The first chainring works with rear sprockets in combinations 1-1, 1-2, 1-3 and 1-4. The second chainring works with chainrings in combinations 2-4, 2-5, 2-6 and 2-7. The third chainring works with chainrings in combinations 3-6, 3-7, 3-8 and 3-9.
The result is that a bike with three front and nine rear sprockets nominally has 27 speeds (39 = 27), but in fact it will only use 12 speeds. And this is enough for trips across terrain with any terrain. It is worth noting that it is not at all necessary to adhere to this scheme, but when using the optimal combinations of switching stars, chain wear is significantly reduced.
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How to determine the number of speeds
The nominal number of speeds is determined by the combination of front and rear sprockets. For example, if a bicycle has 10 rear sprockets and 3 front sprockets, then the nominal number of speeds will be 30, and if there are 9 sprockets at the back, then 27. However, there is one caveat. the actual number of speeds that can be used will be less. This is because all possible sprocket combinations should not be used due to misalignment and incorrect chain tension.
How to switch gears correctly
When driving upwind, on sand, clay, wet mud, or going uphill, the forward gear must be dropped. Then it will be easier to pedal, maneuver and pick up speed.
First forward gear is ideal for lifting if you don’t want to put in a lot of physical effort. The second gear is suitable for small climbs and driving on forest paths. It is recommended to shift into the third forward gear (the largest sprocket) while driving in the city. In this case, the reverse gear is shifted in accordance with the above gearshift scheme.
How many speeds on the bike is the maximum
The gearshift mechanism first appeared on a bicycle in 1903. It consisted of a set of gears hidden inside the rear hub housing. The familiar design was developed in 1950. When choosing a bike, you will notice that they have a different number of speeds. If in a regular car there are 5-6 (maximum 8), then bicycle transmissions can have from 3 to 30 gears. But for what?
Stars in cranks and cassettes
On bicycles equipped with a gearshift mechanism, the main components are installed. cranks with stars (at the pedals) and a cassette (at the rear wheel), consisting of a herringbone sprocket. Each of them always has a different number of teeth that hold the chain when pedaling. When the owner first maintains the bike, he will notice on the surface of each sprocket a stamped number with the letter T at the end. The number indicates the number of teeth in a particular sprocket. To simplify the selection of a new transmission, manufacturers indicate the minimum and maximum teeth in the connecting rod / cassette stars. For example, 10-28T. This means that the smallest star has ten teeth, the largest has 28.
The travel speed depends on the gear ratio. When the chain is on the largest crank sprocket and smallest cassette, the wheel will rotate the most per pedal stroke. Suppose our bike has cranks with 36 / 42T sprockets (36 teeth on the smaller and 42 on the larger), the cassette is still the same 10-28T. When shifting to the highest gear, the wheel will rotate 42: 10 = 4.2 times in one full pedal rotation. Therefore, in the very first gear. 36: 28 = 1.28 times.
What does it give us? The lower the gear, the more times you have to pedal to cover the same distance as a full wheel revolution in the highest gear. Simply put, in the first gear we will be able to accelerate to a low speed, in the last. to a very decent one. You will ask a logical question: why then create a transmission for 18-30 gears? The thing is that a cyclist never rides on a perfectly flat surface (unless he is an athlete on a parquet cycle track, of course). He often has to go down and overcome steep climbs. A large number of gears are created to select the ideal gear ratio, at which a person can comfortably descend a mountain on a high, or climb it in a small gear, without getting up from the saddle. The higher the gear ratio, the harder it is to pedal, but the speed after acceleration will also be higher. In the case of a small gear ratio, the opposite is true. In addition, it must be borne in mind that a car engine is capable of operating in a wide range of revolutions: from 1000 to 9000 and more. Such elasticity contributes to the fact that 4-7 speeds are quite enough for a car. Unlike a car, a person can comfortably pedal only in the range of 80-100 rpm. Therefore, he has to increase the number of gears in the bicycle transmission in order to adapt to the terrain and physical shape of the rider.
Number of gears: what’s the difference
The more gears, the less effort the cyclist will spend on maneuvering or climbing. By the number of gears, you can roughly understand how many stars are installed on a bicycle. For example, if the model has 21 speeds, this means that there are three stars on the cranks, on the rear wheel there is a ratchet or a cassette with 7 stars. Multiplying the number of stars, we get the number of speeds.
Recently, Shimano, which makes components for various bike brands, including Schwinn bikes, has been focusing on the production of multi-star cassettes. A bike equipped with 30 gears is already available for purchase. The difference from other models is that in the largest sprockets, the number of teeth is identical or higher than in the connecting rods. If there is a 36-tooth sprocket in front and behind, then in order to spin the wheel once, the cyclist needs to make a full revolution of the pedals. The larger the first gear sprocket is on the wheel, the easier it is to climb hills. The result is that traveling along forest trails will not drain your last strength.
The number of gears is far from the main criterion for choosing a bike. Focus on the number of teeth on the sprockets in order to have a general idea of the gear ratios, as well as the quality of the components from which the transmission is assembled. Read about the differences between different lines of switches and whether it is worth overpaying for professional components with the next article.
In the Schwinn multi-speed bike collection you will find models for every taste and color. Off-road enthusiasts will love the Mesa’s 21-speed aluminum frame mountain bikes or the proven Frontier and High Timber steel frame bikes. Fans of a comfortable straight ride will find a wide range of comfortable bikes with 21 and 7 speeds, or cruiser bikes with 7 or 3 speeds. This season, the city bike lineup also features the Discover multi-speed model, featuring large wheel sizes, 21 speeds and a front suspension fork.
How to switch
There have never been and never will be strict rules for gear shifting. But there are some combinations that help shift more efficiently and also extend the life of the entire drivetrain. Indeed, during operation, the chain is often skewed due to the arrangement of the sprockets in parallel planes, which causes its wear.
The figure shows the recommended gear combinations for different types of terrain.
In order to reduce wear and increase the service life of the gearshift mechanism, sprockets and chain, it is recommended to shift at the moment of minimum load. This means that shifting in the middle of a climb puts a very heavy load on the drivetrain, which could result in derailleur breakage and chain breakage.
Therefore, riders and amateurs participating in cross-country competitions, where the load on all mechanics is especially great, try to protect themselves from unpleasant surprises and acquire high-class attachments, as well as monitor the condition of the chain and stars, regularly wash, adjust or replace mechanisms.
How many speeds on the bike
People who are far from cycling still have no idea that modern bicycles are equipped with many speeds, a kind of gearbox. The presence of a gearshift mechanism makes it possible for a cyclist to ride in different conditions, which are determined by both the road surface and the terrain. And yet, how many speeds on a bike does a rider or amateur need to have to be completely happy? For everyone, happiness is measured in its own way, but we will try to find out what the programs are for.
How many speeds are on the bike. depending on what!
So, a modern bicycle has 2-3 stars in the front (system) and 5-10 stars in the back (cassette). Gear shifting is carried out using the rear and front derailleurs, which work with the chain, throwing it over the stars of the connecting rod system and along the small stars on the rear wheel hub, from which the speed changes. Gear shift control levers (coins) can be in the form of levers and grip shift. a swivel shift mechanism on the handlebar.
The number of speeds is determined by the quantitative combination of front and rear sprockets. To calculate how many speeds on the bike, you need to multiply the number of chainrings by the number of rear stars. For example, there are 3 stars in the front, and 8 stars in the back, for a total of 24 speeds. There are other variations: 3×5, 3×6, 3×7, 3×8, 3×9, 3×10. over, systems and cassettes can have a different number of teeth on the stars, the speed also depends on this.
The need to switch
The gears on the bike are primarily needed for comfortable, efficient movement in certain conditions. With their help, a cyclist can go faster, accelerate downhill, effortlessly drive up a steep incline, and easily maneuver in difficult areas. for example, in sand or soft mud. or around the city, making constant detours around obstacles. The presence of speeds is one of the signs of a mountain bike, and the more there are, the less suffering will be caused by difficult paths and paths.
Feel the bike. switch right
The only way to find the right combinations individually is by putting your bike to the test. Everyone has different physical capabilities, and for some, 5 stars are enough, and for someone, 10 is not enough, because the main trump card, whatever one may say, remains constant training, exercises and loads on the working leg muscles.
The switching figure shown is a rough guide for a beginner to use. Experienced cyclists, who have learned to feel their bike, are not monitoring the correct gear. The determining factors are the driving conditions and the level of training of the person sitting behind the wheel of a two-wheeled vehicle.