5. Programming of computer
To show Speed and calculate Trip Distance and the other data, your VDO A4+ needs the precise wheelsize = wheel circumference
(in mm or inch) of your bike.
5.1 HOW TO DETERMINE YOUR WHEELSIZE:
The wheelsize setting can be done with an accuracy of 1 mm or 0.1 inch.
The table below shows the most common tire sizes and the related wheelsize-data in mm and inch.
This data not necessarily corresponds with the correct data of your bike.
If your Tyre Size is not shown in the Table, you can find your correct wheelsize as explained below:
STEP 1
Stand your bicycle upright. With your tyre inflated to its proper pressure, rotate your front wheel so that the valve is located
at the bottom (6 o’clock position). Make a mark on the floor to indicate the valve location.
STEP 2
Roll the bicycle forward in a straight line for one complete wheel revolution, until the valve is again at the bottom. Make a
mark on the floor to indicate this valve location.
STEP 3
Measure the distance between the marks in millimetres or inches (1 inch = 25.4mm). This value is your wheel size = wheel
circumference.
5.2 SELECTION OF KMH OR MPH-READING
The VDO A4+ can show speed and all related data either in
km
or
m
. You can switch at any time from
km
to
m
-reading
and vice versa. All data TRP, AVS, MXS, ODO will automatically be re-calculated.
STEP 1
Get TRP in display, press and hold SET-button for 3 sec.
STEP 2
km
or
m
are flashing. Use MODE-button to select
km
or
m
-reading.
STEP 3
Press SET-button to confirm above selection. The A4+ will now show the set-mode for the wheelsize = wheel
circumference.
5.3 PROGRAMMING THE WHEELSIZE
After pressing SET-button to confirm
km
or
m
selection, the A4+ will now show the set-mode for the wheelsize = wheel circumference.
Factory settings for wheelsize are 2155 mm for
km
-reading and 84, 8 inch for
m
-reading.
Attention: For
km
-reading the wheelsize needs to be set in mm, for
m
-reading the wheelsize needs to be set in inches.
STEP 1
Change the flashing wheelsize-digit to requested value by pressing the MODE-button.
STEP 2
Press SET-button to confirm this setting and move to next digit.
STEP 3
Repeat Step 1 and Step 2 until all digits have been set to your wheelsize.
STEP 4
Press and Hold SET-button for 3 sec. to finish Wheelsize-Setting and return to TRP-display.
5.4 CLOCK SETTING
Your VDO A4+ shows actual time in 24:00 (hh:mm) format.
STEP 1
Get CLK into display. Press and Hold SET-button for 3 sec. The Clock SET-Mode will be shown in display.
STEP 2
Use the MODE-button to change the flashing hour-digits. Hold MODE-button for fast setting.
Confirm your settings by pressing the SET-button. This confirmation will also change to Minute-setting.
STEP 3
Use the MODE-button to change the flashing Minute- digits. Hold MODE-button for fast setting.
STEP 4
Press and hold SET-button for 3 sec. to finish Clock-Setting and return to CLK-display.
5.5 PROGRAMMING OF ODOMETER
The total distance counter ODO can be programmed anytime, for example after a change of battery or to enter the ODO data of your old
computer into your new A4+.
STEP 1
Get ODO into display, press and Hold SET-button for 3 sec. The ODO-Set-Mode will be shown in display.
STEP 2
Press MODE-button to change the flashing digit to requested value.
Confirm this setting by pressing the SET-button and simultaneously change to next digit (flashing).
STEP 3
Repeat STEP 1 and STEP 2 until all digits have been set to requested value.
STEP 4
Press and Hold SET-button for 3 sec. to finish ODO-setting and return to ODO-display.
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P07
P07
P08
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WS in mm / inch
1x
P05
CYCLECOMPUTING
Instruction manual
A4+
GB
Tire size
WS in mm KMH WS in inch MPH
47-305
16x1,75
1272
50,1
47-406
20x1,75
1590
62,6
34-540
24x1 3/8
1948
76,7
47-507
24x1,75
1907
75,1
23-571
26x1
1973
77,7
40-559
26x1,5
2026
79,8
44-559
26x1,6
2051
80,7
47-559
26x1,75
2055
80,9
50-559
26x1,9
2060
81,1
n/a
26 x 1,95
2070
81,5
54-559
26x2,00
2075
81,7
n/a
26 x 2,1
2080
81,9
57-559
26x2,125
2133
84,0
37-590
26x1 3/8
2105
82,9
Tire size
WS in mm KMH WS in inch MPH
20-571
26x3/4
1954
76,9
32-630
27x1 1/4
2199
86,6
40-622
28x1,5
2224
87,6
47-622
28x1,75
2268
89,3
40-635
28x1 1/2
2265
89,2
37-622
28x1 3/8
2205
86,8
18-622
700x18C
2102
82,8
20-622
700x20C
2114
83,2
23-622
700x23C
2133
84,0
25-622
700x25C
2146
84,5
28-622
700x28C
2149
84,6
32-622
700x32C
2174
85,6
37-622
700x37C
2205
86,8
40-622
700x40C
2224
87,6
F
P05
F
P06
F
P07
!
MINIMUM WS: 100 mm / 3,94“
MAXIMUM WS: 3999 mm / 157,44“
F
P08
F
P09
