Bike size and bike frame size calculator- Online calculators

Bike Size - Information

We determine the size of the bicycle frames by measuring the length of the section connecting the end of the seat tube with the center of the bottom bracket axis.
Bicycle manufacturers list frame sizes in three ways:

- given in centimeters

- in inches

- given in the names S, M, L, XL

In order for the ride comfort to be appropriate, when determining the size of the bike, the size of the crank should also be selected. Please note that the crank acts as a lever. A longer crank will use less force, and a shorter one will allow you to pedal faster.
The length of the crank is measured from the center of the bottom bracket axle to the center of the pedal hole.

Road bikes , as the name suggests, are bikes that are built to maintain decent high speeds when riding on paved roads and asphalt.
A classic frame must consist of a main triangle of certain maximum and minimum sizes, a rear triangle and a front forks, the size and structure of which are strictly defined by the UCI organization.

Road bike frame sizes are given in centimeters regardless of style, however some manufacturers specify sizes in inches.
Frame measurement: The size of the frame is determined by measuring the length of the section connecting the end of the seat tube with the center of the bottom bracket axis.

Mountain bikes or MTB are specially designed for off-road riding, e.g. mountain paths, forest trails, special obstacle courses. They have much in common with other types of bicycles, but their design focuses more on durability and performance when riding in more difficult conditions.
Bicycle frames come in various shapes depending on the purpose of the bicycle. The most common type of frame is a hardtail (frame without shock absorption), due to its simplicity of construction, low weight and low cost of production and service. In the case of bikes intended for more demanding descents, i.e. downhill and enduro bikes, frames with full suspension are used. Mountain bike frames are usually made of aluminum, less often steel, and frames made of carbon (carbon fiber) are becoming more and more popular. There are also titanium and bamboo frames.

Mountain bike frame sizes are usually in inches regardless of style.
Frame measurement: The frame size is determined by measuring the length of the section connecting the end of the seat tube with the center of the bottom bracket axis.

Trekking (touring) bikes provide the comfort you need for long rides on paved surfaces and the stability you need to maintain fast speeds as you cycle your trail.
They combine the best features of road bikes and mountain bikes. They are used for advanced cycling tourism, consisting in traversing long, often multi-day routes, both on asphalt and unpaved roads.

Trekking bike frame sizes are usually given in inches.
Frame measurement: The frame size is determined by measuring the length of the section connecting the end of the seat tube with the center of the bottom bracket axis.

BMX bikes owe their name to a type of sport that originated in the USA in the 1970s. BMX frames are made of various grades of steel and (mainly in the racing category) aluminum. Cheaper, low-end bikes are usually made of steel. High-end BMX bikes are mainly made of chrome steel or high-strength steel, although the latter is clearly heavier.
BMX bikes are available in the following models:

Park

Dirt

Flatland

Race

Street

In the case of BMX bikes, the frame size is determined by measuring the length of the top tube, i.e. the length of the section from the center of the seat tube to the center of the head tube.
The position and size of the handlebars and the length of the stem are also important.

Kids bikes equipped with durable frames and thick tires, designed especially for children. They are ideal for riding on flat, concrete or hard surfaces where the child can concentrate on riding the bike.

The size of the children's bicycle frame is determined in the same way as the frame size of other bicycles, ie by measuring the length of the section connecting the end of the seat tube with the center of the bottom bracket axle.
However, in the case of children's bicycles, the wheel size is more important than the frame size. Bicycles with different wheel sizes are often mounted on a frame of the same size.

Measuring the size of the children's bike frame

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Bike size and bike frame size calculator