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ENGLISH
3. GETTING STARTED
Before activating your cycling computer, measure the wheel size of your bicycle.
Measuring Wheel Size
Wheel size settings are a prerequisite for correct cycling information. There are two ways of determining
the wheel size of your bike:
Method 1
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.
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
Wheel sizes on the chart are advisory as wheel size depends on the wheel type and air pressure.
Method 2
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
that 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 at the valve to mark a full rotation. Measure
the distance between the two lines.
Subtract 4 mm to account for your weight on the bike to get your wheel circumference. Enter this value in
the cycling computer.
Basic Settings
Before using your cycling computer for the first time, customize the basic settings. Enter as accurate data
as possible to ensure correct feedback based on your performance.
6
Getting Started
Wheel size diameter (inches)
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
Wheel size setting (mm)
1884
1909
1947
1958
2022
2051
2054
2070
2080
2101
2126
2189
2220
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