• English (UK)
  • Deutsch

Logo

menu
  • Home
  • Tools
    • Frame size calculator 2
    • Frame size calculator 3
    • Wheel circumference
    • Windchill
  • Wheel circumference
  • Frame size calculator 2
  • Frame size calculator 3
  • Windchill

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).

Value 1: 
Value 2: 
Result:     mm wheel circumference
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

Sample pictures

55-559

57-559

62-559

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).

Read More

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.


  1. Body lenght - The body lenght is measured from the ground to the sternum (small v-shaped notch below the throat).
  2. Arm length - The arm length is measured from the start of the collarbone to the middle of your clenched fist.
  3. 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.

Body length (ground to sternum) mm

Caution!!!

Values need to be in millimeter

Arm length mm
Inside leg mm
for Cross-Country Tour Enduro
Seat tube length mm mm mm
Head tube length mm mm mm
Stem length mm mm mm
Reach mm mm mm
Seating length mm mm mm
Top tube length (male) mm mm mm
Top tube length (female) mm mm mm
frame size
Read More

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.

5 measurements are needed

mm shoulder width  
mm shoulder height Measuring point outside of the clavicle
mm body length

Ground to sternum
(Notch at the lower end of the throat)

mm fist heigth Ground to knucklebone
with clenched fist
mm inside leg  
Gender: 
Range of use: 

Results

  mm seat length
  mm stem length
mm top tube length
mm head tube length
  mm seat tube length
  zoll seat tube length
frame size 3
Read More

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)

Wind

Windchill Calculator

Air temperature
Wind speed

Windchill temperature = perceived temperature

  
Read More
  • Legal notice
www.template-joomspirit.com