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3. Getting Started
Before activating your Training Computer, measure the wheel size of your sulky.
Measuring Wheel Size
Wheel size settings are a prerequisite for correct riding information. There are two ways of
determining the wheel size of your sulky:
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 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
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 sulky 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 sulky to get your wheel circumference. Enter
this value in the Training Computer.