100
l
Measure the wheel manually for the most accurate result.
l
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.
l
Subtract 4 mm to account for your weight on the bike to get your wheel circumference.
Method 2
Look for the diameter in inches or in ETRTO printed on the wheel. Match it to the wheel size in mil-
limeters in the right column of the chart.
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
52-559
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
Wheel sizes on the chart are advisory as wheel size depends on the wheel type and air pressure.
CALIBRATE CYCLING POWER SENSOR
You can calibrate the sensor from the quick menu. First, choose one of the cycling sport profiles and
wake up the transmitters by rotating the cranks. Then choose
Calibrate power sensor
from the quick
menu and follow the on-screen instructions to calibrate your sensor. For calibration instructions specific
to your power sensor, see the manufacturer's instructions.
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