VDO Cyclecomputing C1DS Instruction Manual page 37

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If applicable, enter wheel size 2 as described above
If you don't need to enter the second wheel size, hold the b key until the computer returns to
main menu TRIPDISTANCE/SETTINGS.
Watch out: Default settings for the wheel sizes are as follows: Bike 1 = 2155 mm and
Bike 2 = 2000 mm. In case you don't set your individual wheel sizes, the computer
works with default values. Readings for speed therefore are likely to deviate signifi-
cantly from the actual values.
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