Dimensions of children’s bicycles
The manufacturer, when producing a children’s bike, knows that the baby is growing very quickly. And therefore, he makes some size adjustments and tries to make the frame in such a way that the adjustment range is as wide as possible. However, the dimensions of the frame should not be taken into account as much as the diameter of the bicycle wheels. High and maximum speed controllability depends on this parameter. You should NOT measure your baby with a caliper, you still DO NOT know how he will grow in six months or even a couple of months, so a child’s bike should be chosen with some margin.
Here is a sample size chart for children’s bicycles.
|Child’s height (cm)||Child’s age||Tire diameter (inches)|
|75. 95||thirteen||up to 12|
|95. 101||3. 4||12|
|101. 115||4. 6||sixteen|
|115. 128||6. 9||20|
|126. 155||9. 13||24|
Frame marking by size
There is a worldwide tradition of marking all bicycle frames with letters, numbers and their combinations. Consider the main types of frame markings in different manufacturers.
There are a total of 6 frame sizes for seat tube height:
- XS is the smallest bike size for the smallest riders;
- S. small;
- M. medium frame variant, the most common;
- L. slightly above average;
- XL. large;
- XXL. well, very large.
And this is where the confusion begins, because each size has two numerically equivalent options. This equivalent is conditional and serves to approximately determine the correspondence of your physical data with the data of a particular frame. And here is this table:
If someone is interested, then the data in this table is calculated using the formula for selecting an adult bike. According to your parameters, where “d” is the length of your legs, and “D”. Frame size. Now we will try to determine by the formula: D = d0.56 / 2.54. The formula uses two factors. 0.56 is the ratio of leg length to height, and 2.54 is the conversion of inches to Centimeters. Such arithmetic.
Since all people are different in size and the same ratio of legs and height cannot be found, this number is also very approximate.
But there are times when your data correspond to the overall dimensions of two frames at once. DO NOT buy two big ones at once. What to do in this case? Think.
- If I am planning an active cycling lifestyle, then I will choose a smaller bike size, because the smaller bike is easier to handle and therefore weighs less.
- If I am fat, then it will be difficult for me to climb the High frame.
- If I am thin and skinny, then I need to choose a frame slightly larger to seem more weighty and not to be blown away by the wind. Quite serious.
- If I have already bought a bike, and it does not suit me with its size, although everything fits together according to the tables, then I probably forgot about the presence of adjustments for the saddle and handlebars, which in most cases have a very wide range. In addition, I always have the opportunity to change the stem or seat tube.
- If I have hands down to my knees, then I’ll take a bigger bike. In which case, you can always reduce the adjustment.
You can also find markings for both a child’s bike and a women’s bike. Pay some attention to them.
Road bike dimensions
The features of road bikes are conducive to long-distance travel on asphalt. Often very distant. Therefore, the ride will take a long time, which requires very careful selection of the dimensions of both the frame and wheels, etc. In the table below we give the recommended dimensions for road bikes.
|Human height (cm)||Category||Frame height (cm)||Tube length (upper / seatpost) (cm)|
|157. 163||XS||49. 51||52/42|
|163. 170||S||51. 54||53.5 / 44|
|170. 178||M||55. 57||55.5 / 50|
|178. 183||M / L||57. 59||57 / 53.5|
|183. 190||L||58. 60||58.5 / 55.5|
|190. 198||XL||61. 63||61 / 58.5|
How to choose the right bike size for an adult or child?
Everything seems to be good. both the color is suitable, and the mechanics work perfectly, but you get tired quickly, and skating turns into torture in an hour or two. All clear. The bike is the wrong size. To avoid such disappointments, you need to know what sizes of velor are, and how they fit your height.
Without theory. nowhere
Almost all bike frames come in a wide variety of sizes. And each manufacturer classifies them differently. Almost every. Each bicycle model has at least 3-4 sizes and, accordingly, different markings. Frames are marked by height in letter and digital form. The defining parameter for any bike frame is the seat tube height. It is measured from the center of the carriage to the tube cutoff and can be specified either in inches or centimeters.
The length of the seat tube, of course, is not the only indicator that characterizes the size of the bike, but the main one. The geometry of the frame is also determined by the angles of inclination of the pipes at the junction, the length of THESE pipes and their relative position. Therefore, it is impossible to say unequivocally that such and such a number is suitable for a specific person, but such and such is not suitable.
The tables, which we will definitely provide, can and should be used. But this is not a panacea for all ills. In addition to the size of the frame in terms of height, there is a difference in the size of the wheel, which should not be forgotten either. There are many options for frames with different lengths of the upper tube, which greatly affects the fit and unloading of the shoulder joints, elbows, and hands. The stem length also greatly affects the fit and has a ton of adjustments. The wheelbase is critical when driving in different conditions, the angle of inclination of the fork affects the handling and stability. there is NO count of everything, so let’s start simple.
Choosing a bike by weight
In this case, unfortunately, we cannot bring the data into a table, otherwise it would be huge. We can give a recommendation. If your weight does NOT exceed 100 kg, ride any bike of adequate quality that is suitable for the size and forget about weight restrictions. If your weight exceeds 100 kg, then you need to pick up a bike with reinforced wheels and a good, expensive carriage, on good expensive bearings.
These are all the recommendations we can give you on the size of your future bike. The main thing to remember is that there is no bad growth, the main thing is to choose a bike that suits you. Have a good choice!
How tall is a 17 ” frame
Choosing a bike is not easy. You need to understand that you will have to ride it for several years until the body does NOT grow (if we are talking about a child). The bike should not only fit you according to the parameters specified in the instructions, but feel as comfortable as possible, easily and quickly. Do not forget to check what materials the model was created from, consult with a specialist or just with friends of cycling enthusiasts.
It is best if you personally test the bike for at least half an hour to get a feel for it, but if there is such an opportunity, look at the most important part when choosing a bike, the size of the frame (size). Here we will talk about the 17th frame, one of the most popular for children and adults. But first in the standards.
17 ” frame
It just so happens that the 17 and 18 inch frames are the most popular. This is not surprising, since according to the standard height charts of all famous world bicycle manufacturers, these two sizes fall into the M category (Medium), covering height from 156 to 178 cm.These figures are practically equal to the average human height in general, and cover several age categories people.
The 17-inch frame covers 156 to 170 cm and is mainly for teenagers and girls. Also, such a size is bought for a child who is significantly ahead of his peers in terms of physical development. Fortunately, now anyone can pick up a bike. bicycle size tables are no less detailed than the same tables for clothes or shoes. All parameters are calculated based on the human body, not the measurements of the bicycle.
What is a size?
The size is a parameter, the distance between the carriage and the upper cut of the seat tube. It is very easy to measure it, since all the necessary parts are on the same line. Place the tape measure against the carriage (base of the bicycle pedal) and guide it to the end of the tube. The resulting distance in centimeters is the size of this particular bike.
This parameter is very important Not only for convenience. The fact is that after a couple of days of cycling, which does not suit you, you risk getting pain in your knees, back, even stretching in the muscles of your legs. The load on the bike is NOT immediately noticeable, so you may not even realize that you are overexerting in vain. And the very next morning, your body will remind you that the bike does not suit you at all.
Often the size is the only necessary parameter for choosing a bike and it’s great if this was enough. But if the situation is ambiguous. for example, your weight is significantly higher or lower than normal, you will have to take into account several more parameters of the human body.
Useful tips for choosing a bike
So, let’s say you are a good fit for a 17 “frame, and the consultant, based on crotch height, weight, arm valleys, and your other measurements, agrees that 17” is your size. But bicycles are different and a seventeen-inch frame on one is not at all the same as on another model. You will NOT be able to guess these features of the production of each specific company, so try it personally.
There is a surefire way to determine if a bike is right for you. trust the first impressions. Adjust the saddle for yourself or ask the seller to do it, sit straight and at an angle, pedal back and forth. you have to figure out as much as possible whether it is convenient for you or not. Try to work out all the basic movements on the bike, and if this is your first two-wheeled friend, then ask the seller for a very detailed consultation for beginners.
Choose your bike wisely and remember that the 17-inch frame only corresponds to the average height of a person, and all other measurements will have to be taken from you personally. take this into account when buying.
How to choose a bicycle wheel size (diameter) for height?
The table lists the popular bicycle wheel sizes and heights for adults and children. Large bicycles in one wheel size are available in several sizes. The table shows the average value, you can choose the diameter of the wheel individually by height.
When driving in the city, it is better to choose a bike with an average wheel size of 24 or 26 inches. When driving on highways, asphalt roads and rough terrain, choose wheels 26, 28, 29 inches. Large bicycle wheels reduce energy consumption at high speeds and transmit less vibration to the handlebars and saddle.
Recommendation: for a height of about 150 cm and below, limit the choice of a bicycle to 24 “wheels for city riding and 26” for riding on asphalt and unpaved roads.
Bicycles with a wheel size of 20 inches are easy to store and transport, but less convenient to ride. Large frame sizes (16 ” and above. adult models) when driving, such models with small wheels are less stable on uneven roads.
Here is the size of the wheels of the bike and the design of the frame depends on the position of the center of mass and the distribution of the rider’s weight. During movement, the cyclist’s weight is constantly transferred between the handlebars, saddle and pedalayama. On bicycles with contact pedals (hooks or turklipsam), leg force is applied to both pedals simultaneously. To reduce fatigue and stress on the Knee, select a smaller frame size or a specially designed frame. On a bike with a regular frame, it may be necessary to change the height, shape and stem. The height and width of the bicycle seat is selected individually.
The inner side of the legs and why it really matters
Yes, the main parameter in the choice is your height. However, in order to accurately select the desired frame size, you also need to make the correct measurements on the inside of the legs. To do this yourself, you need no shoes only in your underwear, the floor with your back to the wall. The knees must NOT bend and the pelvis and heels must touch the wall. In order to take a measurement, you can use a building level or a tape measure. The easiest way is to make a mark on the wall surface and measure the height strictly perpendicular to the floor. This will be the height of the inside of your legs. If there is such a possibility, then measurements are best performed initially in inches. This will greatly simplify the choice and protect you from having to recalculate units of measurement at the time of purchase.
Once you know the inside length, calculating the required frame size becomes much easier and more accurate. But please note that you will have to make a miscalculation yourself, and for each category of bicycles the formula is partially different.
- Bicycles of the double suspension category. To calculate your internal leg length, you need to multiply by 0.225. That is, if the legs are 80 centimeters long, calculate as follows: 80 x 0.225 = 18 inches. In this case, you can choose a frame size of 17 inches for sporty riding, and 19 for touring.
- When choosing MTB bicycles and hardtails, the coefficient by which the length of the legs is multiplied is 0.226.
- For road and cyclocross bikes, the coefficient is 0.635. The result must be divided by 2.54.
- For cross bikes, the coefficient is 0.259.
Age 2. 5 / wheel size 14in
Bicycles with a wheel diameter of 14 “not much different from bicycles with 12-inch wheels. A bike of this size is suitable for a height of 95-110 cm. Large wheels provide better stability, a smoother ride and increased speed. But not all brands make bicycles with a diameter of 14 inches, so the choice of tires and spare tubes for such bicycles is much lower.
Road Road Bikes
In this case, it is also recommended to take a reference point to the table:
Do not forget that there is a rear shock absorber in these models, so if your height does not meet the required criterion in the table, focus on the larger one. In any case, you will have the opportunity to adjust the level of the saddle as it is convenient.
Size, pipe length, connection angles
Regardless of whether you choose a bike only for short-term walks or for regular and active riding, it is absolutely important to choose the right size. It affects the dimensions of the entire frame as a whole, the parameters of all frame pipes.
First, let’s look at how to choose the frame size for the most common bike models: mountain bike, off-road VELOBIKE, hybrids. It is they who today form the basis of the market and it is in this segment that the buyer has the most choice.
Bicycle frame manufacturers themselves are interested in reaching as much of the market as possible, so each frame model comes in several sizes. For some bicycles, there may even be ten or more. In this case, the dimensions of the frame are always indicated in the marking. Designations can be in centimeters, inches, and sometimes even letter designations are found. In professional manufacturers, measurements are taken according to the size of each tube, not just the seatpost. In addition, even the connection angles of all pipes are taken into account.
We suggest orienting yourself according to the table below. It is considered one of the most versatile frame sizes.
Note that this table is most relevant when buying mountain bikes. However, in the absence of alternative sources of information, it can be used when choosing other types.
If you choose a city bike and you have a small height (up to 170 cm), then an important selection criterion for you will be the presence of a rear shock absorber. Namely the seatpost. The fact is that in most models it does not allow the saddle to be fully lowered. Because of this, with low growth, it is better to choose a frame not 18, but 16 inches in size.
Important: if your height does not fit clearly under the table and into a specific category, experts recommend choosing a larger size. But if this is a model with a shock absorber, then you need to act the other way around.
Choosing the Right Size and Approximately Age
Choosing the right bike size for your child may seem like a simple exercise, but often parents do NOT consider other parameters other than age. As you will see from the recommendations that we made below, many of the sizes overlap by age and are more dependent on height, does not speak about the confidence and abilities of each individual child.
Many people choose a bike “for growth”, but it is important to consider that as the size of the wheels of the bike increases, so does its weight. In addition, a taller and lighter bike will also have a higher center of gravity, making it harder to balance and maneuver. As a result, if you choose a bike that is too big for your child, then riding may simply not be fun. Use the Age and Height Recommendations below as a guide and remember that the best way to know if the bike is the right size is to try it on and let your child ride it.
It is also important to note that unlike adult bicycles, in which the frame size changes depending on the cyclist’s height, children’s bicycles are measured by the size of the wheel.
Age 9-11 / Wheel size 24 inches
Bicycles 24 “is often the last step to an adult size bike and is suitable for those between nine and eleven years old or 130-145 cm tall.
Like 20-inch bicycles, there are distinctive features in mountain, BMX and road models. Mountain bikes 24 “have more speeds and more suspension travel compared to mountain bikes 20”. Also mountain bikes with 24 wheels “more often can be equipped with disc or rim brakes with handlebar grips.
24-inch Road bikes extend their gear range to 21 and 24-speed, have slicker tires for higher speeds and lighter frames if your kid has racing ambitions.
Age 4. 6 / wheel size 18 inches
Just as a 14-inch bike is an Alternative to a 12-inch bike, an 18-inch bike is an alternative to a 16-inch bike. A bike with 18 ” wheels is suitable for height 100 to 120 cm and ages 4 to 6.
How to choose the right mountain bike frame size.
Mountain bike manufacturers produce mountain bikes with different frame sizes designed for a specific rider’s height. The correct choice of the height and length of the bike is very important, choosing the right size, you will ensure yourself comfort while traveling, without pain and fatigue in your knees and back. Choosing the right frame is important for amateurs who use mountain bikes for hiking or walking, as well as for athletes participating in cross-country competitions.
An improperly fitted frame can even seriously harm the health of the cyclist, as due to improper fit on the knees, feet and wrists, much more stress will be placed on them.
Moreover, the load on the feet and knees can be partially adjusted by adjusting the height of the seatpost, but the tilt of the body above the bike is not always corrected, and if it is possible, then within small limits. Therefore, in order to get real pleasure from riding and at the same time strengthen, and not ruin your health, you need to know how to choose the right size of the bike frame.
The size of a bicycle is a parameter that depends on the physical dimensions of the frame: its height and length. The larger the size of the lower and upper tubes, the larger the size. Larger frames are suitable for larger cyclists, smaller ones for smaller ones.
The size is most often measured in inches, sometimes in centimeters or conventional units (XS, S, M, L, XL). The size ruler is usually either even or odd. Often, male models have an odd line, and female models have an even line, with sizes one less than men’s.
Choosing a size according to the table
Choosing the right size is not so easy, each manufacturer provides special size tables for mountain bikes, according to which you can make a preliminary selection. Each manufacturer’s tables for mountain bikes are different, but they boil down to the fact that with growth:
- 140-150 cm. frame size should be 13 “-14.5” or 33-36cm or XS (XSmall)
- 150-165 cm. 15 “-sixteen” or 38-40 cm or S (Small)
- 160-178 cm. 17 “-eighteen” or 43-47 cm or M (Meduim)
- 170-188 cm. 19 “-20” or 48-52 cm or L (Large)
- 182-200 cm. 21 “-22” or 45-58 cm or XL (XLarge)
- 200-210 cm. 23 “-24” or 59-62 cm or XXL (XXLarge).
But it is better, of course, to look at the tables from the manufacturer’s company, and the plates are different for male and female mountain bikes. Also, the plate is different for bikes with wheels of different diameters, because larger wheels are better for taller. Accordingly, the frame of the same height, which will be installed in a bike with larger diameter wheels, is designed for a slightly higher height.
For example, the table for AUTHOR men’s mountain bikes on 27.5 inch wheels looks like this:
For AUTHOR 29ers on large 29 ” wheels, the plate has a slightly different look:
For professional carbon hardtails, the Author table looks like this:
For AUTHOR women’s mountain bikes on 27.5 inch wheels, the plate is:
These tables are suitable for those planning to ride a mountain bike in the classic non-aggressive MTB, Trekking or Road style. For those planning to ride more extreme and aggressive, it is better to choose a frame slightly smaller, which will have a positive effect on handling. But please note that too small will cause a lot of inconvenience.
Other methods for choosing a size
Also, you can pre-select the frame using the following method: you need to stand in the walls and measure the distance from the ground to the crotch. The result is multiplied by 0.57 for aggressive riding style, or 0.63 for non-aggressive MTB or trekking riding, this will be the appropriate size in centimeters. To get the result in inches, divide the result by 2.54.
The general rule of thumb for checking the correct size is that you need to have a flat floor above the bike so that the saddle rests on your back. The distance between the crotch and the top tube of the frame should be 5 to 15 centimeters. Too small a distance means that it is too large, which will create inconvenience and a high probability of injury. In this case, choose a smaller frame. If the distance is more than 15 cm, then it is too small, which will worsen the stability of the bike on the track and cause other inconveniences when riding, choose a larger one.
If you approach the issue more professionally, then when choosing, measure the length of the upper and lower tubes, as well as the height of the seat tube and others. Another important parameter is ETT, which stands for “effective bike length”. ETT is equal to the length of the parallel to the ground from the top of the head tube to the extension of the straight seat tube.
It should be remembered that the calculations and tables are general in nature and DO NOT take into account the anatomical features of each person and his riding style, therefore, after preliminary selection of the size, it is advisable to sit in the saddle of the chosen model, or even better to ride, paying attention to comfort. Before that, you should adjust the seat tube and handlebars to your height. In the lower position of the pedal, the leg should be almost completely extended at the knee.
If according to the table two size options suit you, then choose a large one depending on the intended riding style, your physique and anatomical features.
For extreme and active riding, out of 2 suitable options according to the table, it is better to choose a smaller one. a larger headroom above the frame will add confidence and the bike will be more maneuverable. For walking riding style, choose the larger option.
With a full physique, it is better to take a smaller bike. it will be easier to steer, sit in the saddle and dismount. With an ordinary and thin physique, you can safely take a larger bike.
When choosing a frame size, pay attention not only to its height, but also to its length. In different models of the same size, the length of the frame may differ. Length has a big impact on the rider’s fit. Fortunately, the fit can be slightly influenced by adjusting the bike properly.
In order to make the fit on the bike more vertical, you can adjust the angle of inclination of the handlebars closer to you or set the stem shorter. For a more horizontal landing, on the contrary, tilt the steering wheel away from you or set the stem longer. If you notice that your center of gravity is shifted backward or forward, you can move the saddle on the frames slightly forward or backward.
Seat post can be adjusted for height adjustment.
Question # 1: I am choosing the size of the AUTHOR mountain bike. My height is 183 cm, according to the tables from AUTHOR, the frame size can be 19 or 21 inches, which one to choose?
Answer: We choose a bike depending on the intended riding style and your physique. For aggressive riding, choose size 19, especially if you have a full build. For a quiet ride, choose 21 sizes. If you still DO NOT know what style you will skate, in most cases it is better to take 21 sizes, of course, if you have a normal or thin physique.
Question number 2: I have short legs and arms, height 171 cm. I choose a mountain bike AUTHOR, according to their tables it turns out that the frame size can be 17 or 19 inches, which one to choose?
Answer: In your case, it is better to take the seventeenth size, it will be more comfortable for you on such a bike, because it will be a little lower and shorter. You can also adjust the saddle and handlebars. If you have short legs and you Do not quite reach the pedal at its lowest point, the saddle can be lowered. If you have short arms, ask the seller to adjust the stem to make it more comfortable for you. You may have to replace the stem with another, Consult the seller.
Question number 3: I have long legs and arms, height 171 cm. I choose a mountain bike AUTHOR, according to their tables it comes out, the frame size can be 17 or 19 inches, which one to choose?
Answer: In your case, it is better to take the nineteenth size, on such a bike it will be more comfortable for you, because it will be a little higher and longer. You can also adjust the saddle and handlebars. If you have long legs and when pedaling, the leg does NOT fully extend at the lowest point. the saddle can be raised. If you have long arms, ask the seller to adjust the stem to make it more comfortable for you. You may have to replace the stem with another, Consult the seller.