Bike Settings

To view or modify bike settings, go to Settings > Bike settings and choose the bike. The sensors you have linked to the bike appear under the bike name.

You'll find the following settings:

BIKE NAME: Bike 1, Bike 2, Bike 3 or Bike 4.

WHEEL SIZE (MM): Set the wheel size in millimeters. For more information, see Measuring the wheel size.

CRANK LENGTH (MM): Set the crank length in millimeters.

SENSORS: View all the sensors you have linked to the bike.

Measuring the wheel size

Wheel size settings are a prerequisite for accurate cycling information. There are two ways to determine the wheel size of your bike:

Method 1

Measure the wheel manually for the most accurate result.

Use the valve to mark the point where the wheel touches the ground. Draw a line on the ground to mark the point. Move your bike forward on a flat surface for one complete rotation. The tire should be perpendicular to the ground. Draw another line on the ground when the valve is at the starting point to mark a full rotation. Measure the distance between the two lines.

Subtract 4 mm from the distance to account for your weight on the bike to get your wheel circumference. Enter this value in the cycling computer.

Method 2

Look for the diameter in inches or in ETRTO printed on the wheel. Match it to the wheel size in millimeters in the right column of the chart.

You can also check the wheel size from the manufacturer.

ETRTO	Wheel size diameter (inches)	Wheel size setting (mm)
25-559	26 x 1.0	1884
23-571	650 x 23C	1909
35-559	26 x 1.50	1947
37-622	700 x 35C	1958
47-559	26 x 1.95	2022
20-622	700 x 20C	2051
52-559	26 x 2.0	2054
23-622	700 x 23C	2070
25-622	700 x 25C	2080
28-622	700 x 28	2101
32-622	700 x 32C	2126
42-622	700 x 40C	2189
47-622	700 x 47C	2220
55-622	29 x 2.2	2282
55-584	27.5 x 2.2	2124

Wheel sizes on the chart are advisory as wheel size depends on the wheel type and air pressure. Due to te variation of the measurements, Polar cannot be held responsible for their validity.