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MEASURING WHEEL SIZE
DETERMINING YOUR WHEEL SIZE
PRO Scio Computers use the rolling circumference of your wheel and tire combination to
determine speed and distance. The more accurate this setting, the more accurate your ride
information will be. However, variations of less than 30mm from the actual circumference
will have very little impact on the overall accuracy of the unit.
For easy setup, PRO Scio computers come with 14 pre-programmed wheel/tire sizes. Simply
select the size of your tire as you scroll through the list in the programming sequence.
If your wheel/tire size is not one of the sizes in the accompanying chart, or if you desire abso-
lute accuracy, you may enter an exact wheel circumference into the system. Use the method
on the following page for measuring the circumference of your wheel/tire combination.
WHEEL SIZE CIRCUMFERENCE
26 X 1.0 1973
26 X 1.5 2026
26 X 1.6 2051
26 X 2 2114
700 X 20C 2114
700 X 23C 2133
WHEEL SIZE CIRCUMFERENCE
700 X 25C 2146
700 X 28C 2149
700 X 32C 2174
700 X 35C 2205
700 X 40C 2224
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