Keep in mind that the size of the bicycle between two different manufacturers may vary, as there are manufacturers that make measuring the height from the bottom bracket to the seat tube and others do it to the center of the horizontal tube, varying by more than one inch from one manufacturer to another.
Many manufacturers called the sizes of their bikes in letters, it is usually easy access to the manufacturer's website to obtain the equivalence of their carvings letter with the vertical tube measurements determines the actual size.
An approximate guide to the size letter with the numerical size would be:
|XS||14" - 14.5"||39|
|S||15" - 16.5"||39 - 43|
|M||17" - 18.5"||43 - 47|
|L||19" - 20.5"||47 - 51|
|XL||21" - 22.5"||51 - 55|
|XXL||24" - 24.5"|
Does the doubt?
It would be strange that the size of bicycle obtained by calculating the exact size correspond to a frame, or not made ‚Äč‚Äčthat size. For example we get the size 19-inch bicycle that we want only comes in sizes 18 "and 20". In this case we choose the smallest size since it will be easier to get the correct position on the bike with a picture of a smaller size by regulating the longitude of the post and stem.
In any case the test on the bike is the best option.
When buying a bike is very important to choose correct size as this will take us to enjoy more comfort, better performance in addition to avoid pain and injury.
Often considered a factor up to the rider, but can give a reference height is more important as the crotch and forearm when choosing the right size bike.
The size of the mountain bike usually comes in inches, being the most important measure of riser height, to determine the remaining dimensions of the box and is what determines the size of the bike.
In the case of road bike size is usually expressed in inches again taking as most important measure vertical tube frame.
Although you can perform a detailed study of sizing and positioning on the bike, give a reference to the size and settings of the bike used only two measures:
How to get the average of the crotch?
This should be done barefoot, leaning on a wall to make it easier we will measure from floor to crotch point where we stand on the saddle in riding the bicycle.
(We can help the spine of a book that we will rely on the crotch and make reference to the wall.)
How to make the measurement of the forearm?
Simply we will measure from the elbow to the finger, the back of the arm. We can facilitate the process by supporting the arm at right angles with his hand out and getting so far more easily.
How to put the saddle?
The saddle should be placed completely horizontal to the ground, ie should not point upward or downward. We could even help to find a level of its parallelism with the ground.
The height and the saddle back on the bottom bracket is determined by the dimension of the forearm and leg length, for this we will use the measurements obtained by following the instructions above.