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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
Note: Wheel sizes on the above chart are advisory as wheel size
depends on the wheel type and air pressure.