How to find out your bike frame size in inches

How to determine the size of the frame for your height?

The answer to these questions is given in this article.

Selection of sizes for mountain bike frames

Height (cm) Frame size (“) Frame size (cm)
155-165 14-15 35-38
165-170 15-16 38-41
170-175 16-17 41-43
175-180 17-18 43-46
180-185 18-19 46-48
185-190 19-21 48-53
190-195 21-22 53-56
195-200 22-23 56-58

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  • Measure your crotch height

    Measure on the inside of the leg.

    How To Measure A Bike Frame

    The best and most accurate way to measure the height of the crotch is with a level and tape measure. If you don’t have a level, you can use a book and the like:

    • Stand without shoes on a flat surface and squeeze a level (or book) horizontally between your legs.
    • Gently slide the book forward slightly and measure the distance from the top of the level (book) to the ground. It will be better if one of your friends or relatives helps you with this. The resulting value in centimeters corresponds to the height of your crotch.

    Now you can define the required frame size

    For example: For a height of 1m 86cm, the most suitable size would be 19-20 inches or 48-50cm

    • For touring and trekking bikes: multiply the crotch height by a factor of 0.66. The value you get will be the theoretical size of the frame in centimeters. If you multiply the crotch height by 0.259, you get the frame size in inches.

    The actual size of the frame should be chosen by subtracting a certain amount from the theoretical size. Typically, this is about 5 cm (2 inches). When choosing a size, you should proceed from the fact that a bicycle for sports use will be slightly smaller than a bicycle for calm riding. In any case, when choosing a bike, you should sit on it and determine whether it is convenient for you. or not.

    Determining the size of the frame according to the height of the cyclist is reduced to the selection of the required size in accordance with the following tables. But keep in mind that the method for determining the size of the crotch height is more accurate.

    Frame dimensions

    The data that correspond to the parameters of the bicycle frame of the mountain and city bike types are shown in the table below.

    find, your, bike, frame, size

    But the parameters of folding mountain and folding city bikes do not correspond to those indicated in the table. There is only one size available for them, which is suitable for people with a height of 155 to 185 centimeters.

    In the table you can see the dimensions of the frame of the road and road bikes.

    These models are suitable for walking and competition. So, when choosing a bike of this type, you must take into account the parameters of the frame.

    Standard sizes

    Every manufacturer who is engaged in the manufacture of bicycles, from the simplest “iron horses” to professional models, must take into account the standards clearly spelled out in the norms and requirements. According to the rules and regulations, the maximum length of a bicycle can be 2 meters, the minimum is 1.8 meters, and the height is 1.2 meters. Now let’s take a closer look.

    Bicycle dimensions: dimensions and features of choice

    A bicycle is a vehicle that is familiar to everyone from childhood. It is on a bicycle that a small child begins to learn to ride, and after that the “iron horse” is used for walks or professional sports.

    Steering wheel types

    The steering wheel is an integral part of every bicycle, thanks to which transport is controlled. A bicycle handlebar can be:

    • direct;
    • steering wheel-riser, or as it is also called “horns”.

    A straight handlebar is most often installed on mountain and trekking bikes. Experts say that a horn-type steering wheel is more comfortable for driving, as it makes it possible to adjust the position of the hands. But behind the wheel of a straight type, the hands are held exclusively in one position.

    Varieties of bicycles

    The first thing that determines the size as a whole, the dimensions of individual components and parts, is the type of bike. It happens:

    • road;
    • single-suspended or double-suspended;
    • mountainous;
    • highway;
    • urban;
    • cruise;
    • tracking;
    • tourist;
    • BMX;
    • hardtail;
    • hybrid;
    • womens, teenagers, childrens, classic.

    Each of the above types is used for different types of driving in a certain area and territory. For example, the design features of a mountain bike are designed for riding on mountainous, rocky terrain, while an urban bike is perfect for regular trips on a flat road. The trekking bike is preferred by cyclists who like high speed and are cycling professionally.

    Features of choice

    The first step is to figure out why you need to know the size of the bike. So, such parameters are, of course, very important, since the following depends on them:

    • will it be comfortable to ride on it, will it fit the rider’s parameters;
    • method and possibilities of its transportation;
    • where can you store it.
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    Wheel dimensions

    The diameter of the bicycle wheels is what the buyer pays attention to when choosing a vehicle. If we talk about models that are designed for an adult, then the diameter of their wheels can be 26, 27, 27.5, 28 and 29 inches. The diameter of the wheels depends on:

    • the effort that will need to be made to accelerate;
    • the maximum speed that the vehicle can develop;
    • how easy and convenient it will be to manage it.

    It is also worth noting the fact that wheels of a certain diameter are intended for each type of bicycle. For example, bicycles with 26-inch wheels are ideal for off-road riding, pits and obstacles. Wheels in sizes 27.5 and 28 inches are the average size preferred by most cycling enthusiasts. There are manufacturers who sell adult models with 20-inch wheels. Such models are used by fans of extreme driving.

    Scientific approach

    A more accurate and reasonable calculation will allow you to get the maximum comfort from riding the bike you choose.

    It is not only the size of the frame that is important here, but also its effective length, or the ETT value.

    The ETT is based on the length of the cutter line parallel to the road surface. This line starts at the center of the head tube (front end of the frame) and ends at the point where the seat tube extends. The beginning and end of this mowing line are aligned with the center of the section of both pipes. The following ranges of values ​​allow choosing the most comfortable bike according to the rule using ETT values.

    The latter are for racing, sports bikes.

    This approach is used in conjunction with the previous one. That is, together with the size, it is recommended to check the value of the effective bicycle length. Choosing a model that is too short will not allow you to keep your back straight while riding. A bike that is too long will also stretch your joints and back muscles.

    For non-sporting (e.g. urban, road models), 5% is subtracted from the above ETT values.

    Choosing a women’s bike

    For ladies, the above size values ​​are slightly different.

    The girl can check if the bike is suitable for her in the same way. if she prefers a frame with the upper tube raised high, as on a man’s bike. Take a road bike as an example. In cases where this tube is lowered, or a folding bike model with a single reinforced bottom tube is used, this step can be skipped.

    Another calculation formula for men

    Using a tape measure and all the same board or book, measure the distance from the floor to the crotch, and not to the top of the head. Multiply the resulting value by 0.57. for mountain bikes (including full suspension). For track bikes, a factor of 0.63 is used. When choosing a road model, the multiplier is 0.66. A touring bike has a multiplier for the frame size of 0.61, if a shock absorber seatpost is used, an additional 5 cm is subtracted from this value.To convert the result to inches, divide the result by 2.54.

    How to determine the size of the bike frame?

    A bicycle frame is something without which the rest of the bike components would not contact, would not interact with each other. Without a frame, a bicycle would not be a single whole, it would be impossible to ride on it even to the next block, not to mention long trips and bike trips.

    Universal rule

    This simple method is based on the meaning of human height. Stand against a wall and place a book or tablet against the top of your head. Mark a point on the wall that is equal in height to the top of your head. Measure this distance with a tape measure.

    Find the resulting height value or the closest to it in the table.

    Frame height for city bike or hybrid bike, inches

    Mountain frame height, inches

    Letter size of all bicycles

    To check that the selected frame size suits you, stand above the bike frame. In this case, the front end of the saddle should be at the level of the lower back. The distance from the top tube of the frame to the crotch should be on average 10 cm.

    This distance less than 5 cm increases the risk of injury, and more than 15 cm will reduce controllability.

    Determination methods

    You can find out the size of the bike frame using a simple (universal) method or using the most comprehensive calculation method (it relies on other characteristics of the frame and the future bike owner).

    For a child or teenager

    Choosing a bicycle for a teenager in terms of frame size is not much different from similar actions for men and women. But in case of emergency braking, the child must reach with his feet to the road on which he is driving. if, for example, the brakes have failed.

    Here the diameter of the wheels comes to the fore, and not the length or size of the frame.

    How To Measure A Bike Frame

    26, 27.5, 28, 29 (by frame size and other parameters)

    In Soviet times, when the choice of bicycle models was small and numbered only 15-20 models, the main emphasis for adults of different heights was also placed on the diameter of the wheel, and not on the geometry of the frame.

    READ  How road bikes differ from city bikes

    Influence of height on frame length

    On modern bikes it is impossible to adjust the height of the handlebars. The exception is city (road) bicycles with one or more speeds. You will not be able to move the stem to the desired level, which cannot be said about the height of the saddle. Let’s look at road bikes for an example. Their speed is due not only to their lightness (complete absence of unnecessary parts, lightweight carbon frame), but also to the rider’s fit.

    It is much easier to ride, overcoming air (and wind) resistance, “spreading out” over the frame, when the position (height) of the head approximately coincides with the position of the rear.

    The length of the road frame is noticeably longer than that of the standard road builder. Soviet bicycles, including single-speed bicycles, were produced with longer frames than modern single-speed bicycles of the same characteristics. However, the height also affects the length of the frame.

    Choosing too “short” bike, the owner must somehow compensate for this disadvantage by raising (or increasing, if adjustment is not available) the stem. The seatpost is also raised (or extended) as much as possible. All types of racing and touring bicycles have a long frame well suited for tall people. when riding uphill or upwind, such a person spends much less effort.

    For a child or teenager

    Choosing a bicycle for a teenager in terms of frame size is not much different from similar actions for men and women. But in case of emergency braking, the child must reach with his feet to the road on which he is driving. if, for example, the brakes have failed.

    Here the diameter of the wheels comes to the fore, and not the length or size of the frame.

    26, 27.5, 28, 29 (by frame size and other parameters)

    In Soviet times, when the choice of bicycle models was small and numbered only 15-20 models, the main emphasis for adults of different heights was also placed on the diameter of the wheel, and not on the geometry of the frame.

    Another calculation formula for men

    Using a tape measure and all the same board or book, measure the distance from the floor to the crotch, and not to the top of the head. Multiply the resulting value by 0.57. for mountain bikes (including full suspension). For track bikes, a factor of 0.63 is used. When choosing a road model, the multiplier is 0.66. A touring bike has a multiplier for the frame size of 0.61, if a shock absorber seatpost is used, an additional 5 cm is subtracted from this value.To convert the result to inches, divide the result by 2.54.

    Tips & Tricks

    The problem with many aspiring cyclists is that they have the wrong approach to choosing a bike. They pay attention to anything: the color, the number of gears, the comfort of the saddle. But at the same time, the majority completely forgets about the most important criterion. the size of the frame. And while all the details play a role in the selection, the ratio of your height to the size of the frame is the main thing. The wrong choice can be one of the main causes of back and joint pain during prolonged skiing, and also causes more severe fatigue.

    Sizes of children’s bicycles

    The manufacturer, when producing a children’s bike, knows that the baby is growing very quickly. And so 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. The controllability is high and the maximum speed 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.

    Additional tips for choosing a frame

    An important factor in choosing a frame is also your personal riding style. If you are a fan of extreme riding in difficult terrain, then it is recommended to choose a frame that is one size smaller than your norm. This way you will feel more confident on difficult terrain and under heavy loads. And the bike in this case will be much more maneuverable, which is important. But if you prefer a calm and measured ride on a regular road, then it is quite possible to accurately navigate according to the table.

    Choosing the right stem is just as important. There are really a lot of them, so we strongly recommend that you spend some time choosing so that later you do not feel discomfort while driving.

    Always consider your own physique. And it’s not so much about the load on the frame as about ride comfort. If you are thin or have a standard physique, then you can easily choose a large size bike. For overweight people, it is recommended to take one size smaller. It is easier to drive, get on and off the bike.

    Remember that you can adjust the saddle position and stem at any time (but not on all bikes). In many mountain bike models, the stem cannot be adjusted, but the saddle can be raised and lowered quite perceptibly. If you see that the handlebars are not adjustable, do not rush to refuse such a bike. This is made in accordance with the safety standards for bikes designed for extreme riding.

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    Scientific approach

    A more accurate and reasonable calculation will allow you to get the maximum comfort from riding the bike you choose.

    It is not only the size of the frame that is important here, but also its effective length, or the ETT value.

    The ETT is based on the length of the cutter line parallel to the road surface. This line starts at the center of the head tube (front end of the frame) and ends at the point where the seat tube extends. The beginning and end of this mowing line are aligned with the center of the section of both pipes. The following ranges of values ​​allow choosing the most comfortable bike according to the rule using ETT values.

    The latter are for racing, sports bikes.

    This approach is used in conjunction with the previous one. That is, together with the size, it is recommended to check the value of the effective bicycle length. Choosing a model that is too short will not allow you to keep your back straight while riding. A bike that is too long will also stretch your joints and back muscles.

    For non-sporting (e.g. urban, road models), 5% is subtracted from the above ETT values.

    Sizing Kross Bikes

    Finding the right frame size is essential to a comfortable cycling experience. But everything is not so simple when there is no opportunity to get on a bike and try it live.

    There are two selection methods: simplified and detailed.

    Simplified selection method:

    This method is based on the average data on human height, which are summarized in one simple table.

    Height Length of the inner surface of the leg Frame size Frame size
    MTB / CROSS CITY / TREKKING
    152.156 cm 71 cm XXS 13 “(34cm) S 16 ”(41 cm)
    156.162 cm 72 cm XS 15 “(38cm) S 17 ”(43 cm)
    162.167 cm 74.75 cm S 16 ”(41 cm) M 18 ”(46 cm)
    167.175 cm 76.77 cm S / M 17 ”(43 cm) M 19 ”(48 cm)
    175.182 cm 79.82 cm M 18 “(46 cm) L 20 ”(51 cm)
    182-187 cm 86.89 cm M / L 19 “(48 cm) L 21 ”(53 cm)
    188.192 cm 89.92 cm L 20 “(51 cm) XL 22 ”(56 cm)
    192.197 cm 92 cm L / XL 21 “(53 cm) XL 22 ”(58 cm)

    Detailed selection method:

    Road Bike Fit. How To Measure A Bike Frame

    A method has been developed over the years to help you select the optimal frame size. Rising from the saddle to the ground, the distance between the top tube of the frame and the groin should be at least 10cm. We measure it as follows:

    Measuring the distance from the ground to the groin.

    Divide the result by 2.54. We get the number in inches. This is the size you need.

    Since each bike model can have its own, specific, frame geometry, we select the required size from the tables below:

    MTB bikes Level B-series
    Level B, B11, B10, B9, B7 Size in inches sixteen” 17 “ nineteen” 21 “
    The size indicated on the frame S M L XL
    Level B8 Size in inches sixteen” nineteen” 21 “
    The size indicated on the frame S M L
    Level B6, B5, B4, B3, B2, B1 Size in inches 17 “ nineteen” 21 “ 23 “
    The size indicated on the frame S M L XL
    MTB bikes Level R-series
    Level R10, R9, R8, R7 Size in inches sixteen” 17 “ nineteen” 21 “
    The size indicated on the frame S M L XL
    Level R6 Size in inches sixteen” nineteen” 21 “
    The size indicated on the frame S M L
    Level R5, R4, R3, R2, R1 Size in inches 17 “ nineteen” 21 “
    The size indicated on the frame S M L
    MTB bikes Hexagon
    Hexagon B5, Size in inches sixteen” 17 “ eighteen”
    Size indicated on the frame S M L
    Hexagon B3, R8, R6, R5, R3, R2, X3, X2, X1 Size in inches fifteen” 17 “ nineteen” 21 “ 23 “
    The size indicated on the frame XS S M L XL
    Lea Women’s MTB Bikes
    Lea R6, R4, R2, F4, F3, F2, F1 Size in inches 13″ fifteen” 17 “ nineteen”
    The size indicated on the frame XXS XS S M
    Urban bikes
    Inzai, Seto, Noru Size in inches sixteen” 17 “ nineteen” 21 “
    The size indicated on the frame S M L XL
    Trekking bikes
    All bicycles of the Trans series Size in inches 17 “ nineteen” 21 “ 23 “
    The size indicated on the frame S M L XL
    Cross bikes
    Evado 7.0. 1.0 Size in inches 17 “ nineteen” 21 “ 23 “
    The size indicated on the frame S M L XL

    The next important parameter is your riding style. In classic styles (MTB, road sport, trekking) the above selection principles are 100% valid. But if you want to use your bike in more extreme conditions (marathon, XC races, 4x, enduro, downhill), then you should buy a smaller size (one, and in some cases, two sizes smaller). This is because a shorter base will be more maneuverable.

    The small size should not be overused as it will always negatively affect the comfort of daily use of the bike. It is necessary to try to find your “golden mean” based on calculations, riding style and the experience of other cyclists.

    Enjoy riding the right bike.

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