Wheel circumference

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).