To set up the cycling computer the exact wheel circumference is needed..
The wheel circumference will vary depending on the rim, the pressure and the weight load. The most exact results will be archieved by rolling off the wheel with the cyclist in the saddle.
A computed result is possible with the following circumference calculator. The needed values are ETRTO information on the wheel's edge (see sample pictured).
Zoll |
ETRTO |
|
Zoll |
ETRTO |
16" |
50-305 |
|
26" |
50-559 |
|
35-349 |
|
|
54-559 |
|
37-349 |
|
|
57-559 |
18" |
40-355 |
|
|
60-559 |
|
50-355 |
|
|
37-590 |
20" |
35-406 |
|
28" |
20-622 |
|
40-406 |
|
|
23-622 |
|
47-406 |
|
|
25-622 |
|
50-406 |
|
|
28-622 |
|
54-406 |
|
|
30-622 |
|
60-406 |
|
|
32-622 |
24" |
47-507 |
|
|
35-622 |
|
50-507 |
|
|
37-622 |
|
54-507 |
|
|
40-622 |
|
57-507 |
|
|
42-622 |
|
60-507 |
|
|
47-622 |
|
62-507 |
|
|
50-622 |
26" |
35-559 |
|
|
54-622 |
|
40-559 |
|
|
60-622 |
|
47-559 |
|
|
32-630 |
|
|
|
|
40-635 |
The ETRTO (European Tire and Rim Technical Organization) size marking shows the width and the inner diameter of the wheel. 57-559 = 57mm width and 559mm inner diameter).
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Calculation of the frame size with the Body-Index-Frame-Sizing method.
Another possibility to find your best frame geometry is the Body-Index-Frame-Sizing method. This method was invented by the magazine „Mountain BIKE“. To calculate your personal frame size there is a little bit more effort to do. Therefor you get detailled information to find the bike which fits you the best. The determination base differs from the so far used formulas of the various providers. The tendency is more towards somewhat smaller framesizes. Three measurements are needed.
- Body lenght - The body lenght is measured from the ground to the sternum (small v-shaped notch below the throat).
- Arm length - The arm length is measured from the start of the collarbone to the middle of your clenched fist.
- Inside leg - To measure your inside leg you place yourself barefooted against a wall, put a level between your legs and push it slightly upwards. The distance between the ground and the upper edge of the level shows the inside leg.
Please put your personal values into the first three boxes.
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Frame size calculation
Five measurements are needed.
The correct frame size is the most important element for maximum driving pleasure. Only those who feel comfortable on their bike will ride it regularly. In order to calculate the correct frame size, several factors must be considered.
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Windchill factor
Wind-chill or windchill, (popularly wind chill factor) is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of air.
Wind chill numbers are always lower than the air temperature for values where the formula is valid. (Source Wikipedia)
Windchill Calculator
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