How to measure the size of a bike frame with a tape measure

Why is it important?

Rostovka is a characteristic that affects the overall dimensions of the frame. With an increase in this parameter, a proportional change in the length of all pipes occurs. The correct size ensures ride comfort, and the cyclist avoids back and knee pain associated with inappropriate frame sizes. In addition, it becomes much easier to drive a vehicle and the risk of a figure eight, which then has to be corrected when driving on uneven roads, is reduced.

measure, size, bike, frame

General recommendations

Before choosing a bike frame according to your height, you need to take an accurate measurement of your body length. To do this, the following procedure is performed:

  • the cyclist stands barefoot against the wall, pressing his heels close to it;
  • knees need to be straightened;
  • a mark must be made at head level;
  • a tape measure the distance to floor level.

Answering the question: “how to choose a bicycle frame for height”, it is also worth considering the following factors:

  • Riding style. For active or extreme driving, you should choose the smaller one of the suitable sizes. Quiet driving in the city assumes the choice of the size “back to back”.
  • Body type. For thin people and people with a normal physique, it is recommended to lean towards a larger size. When overweight, choose a smaller size for easier fit and handling.
  • The presence of useful adjustments. Stem tilt and saddle adjustments allow you to adjust the rider’s position. Mountain models rarely have handlebar tilt adjustment, but there is an opportunity to purchase a more suitable stem.

Mountain, urban and hybrid

How do I size my mountain bike frame for my height? You can use the table below to choose a hardtail, but there are exceptions: Gary Fisher models have a longer frame than other brands.

A comfortable city or hybrid bike may have a seat post that will prevent the saddle from being pulled close to the frame. Therefore, in the case of transitional growth (1.77 m or 1.63 m), it is necessary to lean towards the smaller size. This will help you quickly figure out which frame to choose for your bike.

Height, mFrame
InchesCentimetersConventional units
1.30. 1.45thirteen”33XS
1.35. 1.5514″35.6XS
1.45. 1.6015″38.1S
1.50. 1.6516″40.6S
1.56. 1.7017 ″43.2M
1.67. 1.78eighteen”45.7M
1.72. 1.8019″48.3L
1.78. 1.8520″50.8L
1.80. 1.9021 ″53.3XL
1.85. 1.9522 ″55.9XL
1.90. 2.0023 ″58.4XXL
1.95. 2.1024 ″61XXL

Choosing the size of the bike frame by height: table and general recommendations

What should you focus on when choosing the size of the bike frame according to your height? This is the main question, because its correct size is the most important factor that must be taken into account (in addition to other recommendations) when buying this type of vehicle.

Road and highway

When choosing a frame for a road or road bike, you can rely on the following table.

Height, mFrame
InchesCentimetersConventional units
1.57. 1.6349. 51XS42/52
1.63. 1.7051. 54S44 / 53.5
1.70. 1.7855. 57M50 / 55.5
1.78. 1.8357. 59M / L53.5 / 58.5
1.83. 1.9058. 60L55.5 / 58.5
1.90. 1.9861. 63XL58.5 / 61

Choice

For each model, regardless of whether it is for men or women, there are recommendations on how to choose the size of the bike frame for height. The table shows them clearly.

Folding

Which frame to choose for a folding bike? Most folding models are made in a universal size that matches the proportions of the bike frame and height. The table will tell you which model to give preference.

ModelHeight, m
Author Simplex1.50. 1.95
Shulz easy1.50. 1.85
Shulz goa 31.55. 1.85
Shulz goa 81.75. 1.95
Giant Expressway 1 & 21.55. 1.85
Giant halfway1.60. 1.80
Giant subway1.60. 1.80
Strida mini1.40. 1.60
Strida LX, 5.2, SX, SD1.53. 1.93

The size of such models means the length of the upper frame tube. To correctly select a BMX bike frame by height, use the table.

Height, mFrame, inches
1.40. 1.5019.5 ″
1.50. 1.7020.0 ″
1.70. 1.8020.5 ″
1.80. 1.9021.0 ″

If you need to understand how comfortable it will be to use such a bike, then it is best to try to ride one of the models.

HOW TO MEASURE BIKE WHEEL AND FRAME DIAMETER?

Today, the popularity of cycling has increased dramatically, this is due to the fact that people have begun to pay more attention to their health. Many experienced cyclists know everything from “a” to “z” in this business, but beginners sometimes do not even know what their wheel diameter is. Next, we will talk about how to measure the diameter of a bicycle wheel and how to measure the size of the frame.

WHEEL DIAMETER

How to Measure a Bicycle Frame Size

A bicycle usually has two wheels. As a rule, bicycles use spoke wheels with steel spokes, there can be from 12 to 42, but, as a rule, there are 32 or 36 of them.

Some sports bicycles are fitted with 4-6 pairs of flat carbon fiber spokes. Disc wheels are used, most often for cycling, have the greatest rigidity and aerodynamics.

The wheels, along with the frame, are the most important structural elements of a bicycle, it is the wheels that withstand all the load created by the cyclist. Also, the wheel must withstand all shock loads that occur with unevenness on the road.

Modern wheels are both very strong and lightweight at the same time. A wheel usually consists of spokes, a hub, a tube with a tire, a rim.

The size of the wheel is of great importance, with large wheels you can reach higher speeds, and with small ones, the bike is more compact. The smallest 20 “wheels are used in folding models, 26” wheels are most commonly used for mountain bikes, and the largest 28 “wheels are common for road bikes.

Now, after all, let’s answer the question, how to measure the diameter of a bicycle wheel? And this can be done as easy as shelling pears. The size from the highest point of the wheel to the lowest point will be the diameter of the bicycle wheel.

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FRAME SIZE

The size of the bike frame is selected based not on the height of the cyclist, but on the length of his legs, so you first need to know how to measure the size of the bike frame in order not to become a “victim” of the wrong purchase.

The bike frame is the main body to which the bike components attach. A bicycle frame is usually welded from profiles that form two so-called triangles. the front axle and the rear axle.

The bike frame is selected solely on the capabilities of both the material and physical data of the cyclist, as well as on what you are going to do on this bike, just ride in the park or on the slopes of the mountains, or can jump from high slopes and steep jumps.

Still, how do you measure the size of a bike frame? If you decide to buy a sports bike, then you need to stand on a flat floor without shoes and measure the height of the crotch, a tape measure will help you with this, multiply this figure by a factor of 0.665. for sports or road bikes.

And those who buy a bike for aggressive riding on hills and slopes, that is, a mountain bike, then multiply your figure by the coefficient for mountain bikes. this is 0.226, as a rule, mountain values ​​go in inches, the resulting figure must be multiplied by 2.54 and then we get the size in inches.

A table to help you determine the size of the frame for your height:

Children’s transport

A completely different bicycle size has been developed for children. The length of the frame is not taken into account (it is standard), in this case the size of the wheel is important. Two-wheeled vehicles are selected based on the correspondence of the child’s age and size to the tire diameter:

If the growth of a baby or adolescent does not correspond to the years (higher or lower than peers), you should focus on him, and not on age.

Scientific method

From a professional perspective, it is not enough to simply measure one of the tubes to determine the size of the frame, ETT is used. the abbreviation stands for “effective bike length”. Calculated ETT as the length of a segment parallel to the ground from the top of the head tube to the extension of a straight seat tube (called ST itself).

Relying on a specific manufacturer of bicycle frames is not worth it, even the dimensions given in the documents sometimes turn out to be erroneous. Measurements should be done by yourself.

Mountain

The selection of mountain models for growth is carried out, guided by similar tables. The structures have the same geometry as the urban variants, only the frame is more reinforced. Also, there is no clear division into female and male models. usually they are all universal. Cushioning is required at the rear, and sometimes at the rear and front. Also, mountain models differ from urban models with powerful wheels, the ability to switch speeds.

If you cannot choose a bike by height, you should proceed as follows: if the bike is without shock absorption, you should choose a larger size, if with shock absorption, smaller.

An example of calculating the frame of a bicycle with a double suspension category

By measuring the inside length of the legs, it is easy to determine the correct size of the mountain bike frame. To do this, multiply the crotch height by a factor of 0.226.

For this calculation, the best option would be to choose a frame with a height of 18/46 cm. For a sporty riding style, it is better to choose a bike with a 17 “frame, while for tourist riding, a 19” frame size is perfect.

You can see an example of selection by height of a mountain bike in the diagram:

Scientific approach

A more accurate and reasonable calculation will allow you to get the maximum comfort from the ride on 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.

To calculate ETT, the length of a line parallel to the road surface is taken. 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 line coincide 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.

Double-suspended models

Difficult to choose the size in the case of full suspension. high mobility and shock absorber change configuration sometimes too seriously.

Size charts

Each size table below will help you determine the range of models you are interested in, but the main thing to know is that no size can be determined accurately. 18 or 24 inches is the manufacturer’s estimate of a very specific distance. for example, the length of the seat tube, or the distance from the center of the carriage to the junction of the extensions of the upper tube and the headset. there can be many measurements!

Therefore, it is very dangerous to buy a bike via the Internet or “by eye”. any bike should be tested in action, sit on it, feel the maximum distance from the seat to the pedals.

Urban (walking)

Urban models are the most common, but at the same time, the simplest bicycles for both adults and children. Often they are not graded at all. The conditional distribution looks like this: women. 155-180 cm or men 165-190 cm in height. If there is a gradation, it becomes much easier to choose the optimal bike.

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Urban two-wheeled models often lack shock absorption. In the event that the shock absorber is located at the rear (in the area of ​​the seatpost), it will not allow the seat to be lowered to the lowest position. Therefore, it is recommended to choose a slightly smaller frame size:

Folding models are also referred to urban models, which are convenient to transport in a car, store in a small room. They are rarely distributed according to height, but in such models there are more options for adjusting the position of the steering wheel and seat than in traditional products.

Male Female

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.

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.

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 size of the frame. 0.61, if a shock absorber seatpost is used. another 5 cm is subtracted from this value.To convert the result to inches, divide the result by 2.54.

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.

Scientific approach

A more accurate and reasonable calculation will allow you to get the maximum comfort from the ride on 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.

To calculate ETT, the length of a line parallel to the road surface is taken. 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 line coincide 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.

Why it is important to know the frame size?

By making the mistake of choosing a bike frame, you will turn your bike into a “torturer” who mocks you more than brings pleasure to the ride.

To bend in three deaths on a teenage bike or, on the contrary, with a short stature, barely reach the pedals with your feet, because the upper tube of the frame almost rests between the legs is a dubious pleasure.

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.

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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 bikes

To check that the selected frame size suits you, stand over 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.

Double-suspended models

Difficult to choose the size in the case of full suspension. high mobility and shock absorber change configuration sometimes too seriously.

How to choose the right bike frame size?

Many people choose a bike by the size of the wheels, some by the color. The main thing, of course, is the convenience of the athlete, and this is achieved by the following key elements:

  • Bike frame size and configuration.
  • Saddle comfort.
  • Drive quality.

In fact, only the frame and handlebars seriously affect the rider’s position and can either create ideal conditions for pedaling or seriously spoil the ride pleasure. Most importantly, an incorrectly selected frame can damage the cyclist, as serious loads will fall on areas of the body that are not prepared for this, such as the wrists or knees.

But if the load on the knees or feet can be compensated for by adjusting the seat tube or pedals, then the tilt of the body over the bike is very rarely amenable to change. Therefore, in order to maintain health and get real pleasure from riding, you should know how to determine the size of the bike frame.

Features of frame types

What should you pay attention to when choosing a bike? Consider the recommendations for the type of frame.

  • Versatile cross-country. The straight and clear frame makes this type a reference. When choosing, we use a universal rule and carefully look at the stem and the configuration of the saddle. They can be “unexpected” in size and seriously change the configuration.
  • Road bike frames must fit perfectly, as every inch of leverage on a moving body directly affects power and speed. It is important to pay attention not only to the configuration and length, but also to the handlebars, which take on a very large load corresponding to the weight of the athlete.
  • For downhill and mountain bike frames, it is especially important to leave safety distances both under the saddle and at the level of the handlebars. it makes no sense to select a configuration that will interfere with a sudden fall or full activation of the fork.
  • Cruisers. The main thing is convenience. Pay attention to the position of the saddle and arms. It makes no sense to look at the nominal dimensions, since even within the model range of one manufacturer they may differ.

Scientific method

From a professional perspective, it is not enough to simply measure one of the tubes to determine the size of the frame, ETT is used. the abbreviation stands for “effective bike length”. Calculated ETT as the length of a segment parallel to the ground from the top of the head tube to the extension of a straight seat tube (called ST itself).

Relying on a specific manufacturer of bicycle frames is not worth it, even the dimensions given in the documents sometimes turn out to be erroneous. Measurements should be done by yourself.

Baby

Of course, the child does not care what frame size, and on any frame it will be inconvenient for him in six months, but buying bicycles “for growth” is still not worth it if the health of the baby’s joints is expensive.

Size charts

Each size table below will help you determine the range of models you are interested in, but the main thing to know is that no size can be determined accurately. 18 or 24 inches is the manufacturer’s estimate of a very specific distance. for example, the length of the seat tube, or the distance from the center of the carriage to the junction of the extensions of the upper tube and the headset. there can be many measurements!

Therefore, it is very dangerous to buy a bike via the Internet or “by eye”. any bike should be tested in action, sit on it, feel the maximum distance from the seat to the pedals.

General recommendations for selection

Usage mode

The main thing in choosing a frame is the type of ride. How the bike can be used?

  • Walking bike. Size is actually not really important, because the loads will be rare and not very serious. You can leave extra space for convenience: lower frame, higher handlebars to easily get off the bike.
  • Racing and road riding are the exact opposite of walking. It is desirable for the sadok to have the handlebars as low as possible in order to use the extra force when pedaling. The dimensions of the frames in this case must exactly correspond to the height of the cyclist; universal changes will not be enough.
  • Tourist or urban cross-country is a universal style, general guidelines are more or less suitable for it.

Road Bike Fit. How To Measure A Bike Frame