Bicycle growths: table. Rostovka bicycle frame

The most important parameter, on which it makes sense to pay attention when choosing this vehicle, is the bicycle growth (that is, the frame dimensions). Not so important material, model and appearance, as comfort and the appropriate size of an iron horse. Only in this case it will be convenient to travel.

History of growths

To choose the optimal size of a bicycle, it is necessary to take into account a number of parameters. Previously, everything was much easier. In Soviet times, only road and road bicycles were met. The frame had standard geometry, and the upper tube was always strictly horizontal. Therefore, to choose the optimal height was easy. If necessary, it was always possible to additionally adjust the position of the rudder and the saddle. Selection was carried out on a horizontal pipe, because it was the only parameter that could not be corrected. In other words, only the rim of the bicycle frame was used as the most important parameter. All the rest was adjusted for growth.

Currently, the range of bicycles has expanded. There were frames of various geometries, for many types of bicycles the seat tube is located diagonally. Very often one has to deal with an uncontrolled steering wheel, etc. All this complicates the choice of a suitable model. And besides this, manufacturers differently consider the height and use different length systems. Now it is used not only the rimming of the bicycle frame, but also the size of the wheel, the distance between the rudder and the seat and other parameters. However, the height of the seat tube is still one of the leading factors. When jumping from a too high bike you can hit your groin and even damage yourself. If the frame is too low, skating becomes uncomfortable, you have to lift your legs above your head, as a result, the load is distributed incorrectly, which is also harmful to health.

The notation used in the formulas

The calculation formulas used are rather crude. In addition, there are a great many. They can vary not only from model to model (mountain, highway, sports), but also from the producer to the manufacturer. However, the formulas take more into account the features of the bicycle, rather than the person. And yet in shops often resort to the calculated method of selection.

On a bicycle, the parts are designated as follows:

• C is the length of the seat tube.
• SS is the horizontal distance between the seat and the rudder.
• SIZE (CC) (the center of the pedal carriage is the middle of the upper tube).
• SIZE * (CT) (center of the carriage - upper trim of the seat tube). This so-called. Growth of the frame.

From a person, only one parameter is required: the height of the perineum - VP. It is measured on the inside of the foot, from the heel to the groin. In some cases, human growth is also used.

How to identify a suitable bicycle rider: formula

At selection it is necessary to specify a method of measurement of growth of a frame: CC (center-center) or CT (center-top). The formulas in this case will be different.

Rostovka highway bike is calculated by the following formulas:

• SIZE (C-C) = 0.65 x VP.
• SIZE * (C-T) = 0.67 x VP.

Rostovka mountain bike is calculated differently:

• SIZE * (C-T) = 0.67 x VP-10 cm.
• SIZE (C-C) = 0.67 x VP-12 cm.

For mountain bikes, the distance from the rudder to the saddle is of primary importance, since the first is often impossible to regulate.

Fitting method

To do this, stand on a flat surface, holding the seat tube between your legs. It is necessary to measure the distance between the groin and the frame. For a road bike, this parameter is optimal at 25-75 mm, and for a mountain bike - 100-200 mm, in some cases up to 5 cm.

table of correspondence

However, not all shops have the opportunity to try on a bicycle. Therefore, various matching tables are often resorted to. For different models, the parameters may vary. Usually bicycle rosters are indicated in inches (figures), less often - in centimeters. An alphabetic designation may also be used. But the most generalized experience will look like this:

Of course, the proportions are taken averaged. Precision to a millimeter is not expected. However, some orientation in the sea of goods will help. Knowing at least an approximate relationship between body length and frame height will greatly narrow the search circle.

Choosing a bicycle to grow according to the type of riding

The height of the frame will differ not only from the purpose of the bicycle, but also from the style of riding, the planned operating conditions. And this convenience of this or that kind of riding is determined by the growth of a bicycle. The table will help you decide the choice. So, for unhurried city walks it is possible to get a two-wheeled friend on the upper border. For example, with an increase of 160 cm, an 18-inch bicycle will be quite comfortable for urban conditions. And for aggressive driving, mountain trails and other complex elements, it is better to use a more compact iron horse with a frame of 16 inches or less.

Other parameters of the growth: the size of the wheel

Often manufacturers indicate the diameter of the wheel. Depending on this size, all bicycles can be divided into children's and adults. The first category includes wheels with a diameter of 12 to 24 inches. 20-24 inches are already considered teenage. By the way, grown-ups of low growth can easily ride on such models, since the iron horse with a large wheel proportionally increases the frame, the distance to the steering wheel and all other parameters.

26 and 29 inches are common sizes for adult mountain bikes. The figure 28 is often found on models intended for urban skiing.

How to determine the optimum height of a bicycle seat

Perhaps this is the only parameter that is regulated. Rarely there are models where the seat height remains unchanged and depends on the bicycle's growth. Determine the optimal location can only be experienced. Sitting in the saddle you need to twist the pedals. At the bottom point the leg should not straighten completely, but remain slightly bent (not more than 160 degrees). At the top, the thigh can be placed horizontally, parallel to the ground and slightly tilted down. The knee should not go above the pelvis. This indicates that the saddle is too low.

Steering height

When determined with the saddle, go to the steering wheel, because their location is interrelated. To determine the height of this part of the bike, the chosen way of riding will play a primary role.

For racing tracks and high-speed driving, the steering wheel is placed below the saddle by about 10 cm. Depending on the individual features,

For aggressive driving and the same tourism, when it is supposed to overcome various obstacles, descents and ascents, the steering wheel should stand 2-6 cm below the saddle. For the elderly, it is permissible to set them on the same level.

For walks around the city, the highway and skiing along the flat slopes of the rudder, you can place the saddles higher or on one level.

Saddle width

Another parameter that cyclists traditionally pay little attention to. Although it has little to do with the issue of bicycle growth, it is completely in vain ignored, because much depends on a comfortable seat. If it is too narrow, then there may be rubbing, and the buttocks and lower back may begin to ache. An incorrect saddle can cause various health problems. If it is too wide, then pedaling will be inconvenient, because the hip will not be able to move freely. The sciatic hillocks should not be on the slopes, but on the even edges of the saddle. Then it will not cause discomfort, get between the buttocks, rub, etc.

Find out at what distance the sciatic mounds are from each other, you can as follows: you need to sit on flat sand, and then measure the distance between the deepest depressions. This is the optimal width. It should be remembered that women have pelvis more than men. Therefore, bicycles for the fair sex differ not only in color, but also in the width of the saddle.

It is better to go to a specialized store to buy. Here, experienced salesmen will prompt you how to choose a bicycle rider, taking into account all the features of a person and the expected style of riding.