VDO Cyclecomputing C4 Instruction Manual page 30

GB
4.2 Measuring and setting the wheel size(s)
In order for your VDO computer to precisely calculate speed and distance, you have to mea-
C1
sure the circumference of your wheels With an incorrect wheel size set, all related values like
C2
C3
speed, trip distance, odometer etc. come out false. To make the use of your VDO computers
C4
possible on 2 bikes, i.e. Mountain Bike and Road Bike, you are able to set up 2 different
wheel sizes.
Measuring both wheel circumferences:
step 1 Place the front wheel valve perpendicular to the ground
step 2 Mark this spot on the ground for example with chalk
step 3 Turn the wheel forward for one full circle until the valve is
perpendicular to the ground again
step 4 Also mark this spot.
step 5 Measure the distance between the two spots (markings)
This is your wheel size.
step 6 Set-up your wheel size in your VDO computer as
described below.
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