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lMeasure the wheel manually for the most accurate result.
lUse 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.
lSubtract 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
millimeters 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.
DELETE A PAIRING
To delete a pairing with a sensor or mobile device:
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