Polar CS300 User Manual

     11

ENG

4. WHEEL SIZE 
 

Wheel size settings are a prerequisite for accurate cycling  

 

information. To measure size, choose one of two methods:

 

METHOD 1

1.  Find the wheel diameter printed on the frame. 

2.  Match the diameter in inches or in ETRTO to wheel size  in  
 

millimeters on the right side of the chart. Note that wheel sizes  

 

in the above chart are approximate, as wheel size depends on  

 

wheel type and air pressure.

 

METHOD 2

1.  Starting with the valve stem exactly at the bottom with a  
 

mark on the ground, move your bike on a fl at surface straight  

 

ahead for one complete wheel rotation. The tire should be  

 

perpendicular to the ground. Mark the point at which the valve  

 

stem is exactly at the bottom again.

2.  Measure the distance between the two marks and subtract 4 mm to account for your weight on the bike. This is the wheel circumference,  
 

and the value to use in your cycling computer.

Wheel size diameter 
(inches)

Wheel size setting 
(mm)

ETRTO

25-559

23-571

35-559
37-622

47-559

20-622
52-559

23-622

25-622

28-622

32-622
42-622

47-622

 

26 x 1.0

650 x 23C

26 x 1.50
700 x 35C

26 x 1.95

700 x 20C
26 x 2.0

700 x 23C

700 x 25C

700 x 28

700 x 32C
700 x 40C

700 x 47C

 

1884 

1909

1947

1958
2022

2051
2054

2070

2080

2101

2126
2189

2220