Vdo cyclecomputing A8 User Manual
CYCLECOMPUTING
Instruction manual A8
CLOSEOPEN
Congratulations on your purchase of a VDO Cycle Computer. To enjoy the full potential of your computer and benefit from all the technical
features, we recommend you thoroughly study this manual. You will find crucial hints for its operation as well as many more tips.
We wish you many enjoyable rides and trips on your bike with your VDO cycle computer.
Please check the packaging before starting the installation to ensure the contents are complete.
1. Button Function
RIGHT BUTTON (MODE-Button) In Cycling Mode: Use this button to progress through the ODO, TRP, ATM, AVS,
MXS, CLK screens.
In SET-Mode: Use this key to adjust values within the Set-up screen
LEFT BUTTON (SET-Button) Use this button to access the set-up screens for Wheelsize, Clock and Odometer.
In SET-Mode: Selection of digit to be changed
2. Computer-Functions
ACTUAL SPEED (KMH/MPH) Actual Speed is permanently shown on the display, up to 120 KMH (75 MPH) with an accura-
SPEED-COMPARISON (st) Does a comparison of Actual to Average Speed.
Is shown on right side by “Speed-Arrows”
(
(st) = actual speed same as average speed
(
TRIP DISTANCE (TRP) Shows Trip Distance of actual ride, up to 999. 99 KM or M. At overflow of 999.99 counting
(TRP = TRIP)
AUTOMATIC TIMER (ATM) Shows Ride Time of actual trip. Automatic Start/Stop.
(ATM = AUTOMATIC TIMER)
Counts up to 9:59:59 (h:mm:ss)
At overflow of 9:59:59 re-starts counting from 0:00:00.
Simultaneously values for TRP, AVS, MXS will be reset to Zero.
AVERAGE SPEED (AVS) Shows Average Speed of actual trip. Value is calculated based on ATM and TRP-data.
(AVS = AVERAGE SPEED)
MAXIMUM SPEED (MXS) Shows Maximum Speed of actual trip, up to 120 KMH (75MPH)
CLOCK (CLK) Shows actual time in 24-hour-format.
TOTAL DISTANCE ODOMETER (ODO) Shows accumulated Total Trip Distance data of all individual trips. Counts up to 99999 KM
or M. Value is re-settable after change of battery.
SLEEP MODE To prolong battery life, the A8 will automatically enter „sleep“ mode after 3 minutes of non-
3. Reset of computer
3.1 RESET OF ACTUAL TRIP DATA
To Reset actual trip data TRP, ATM, AVS and MXS press SET plus MODE-button simultaneously for 3 sec.
3.2 RESET OF COMPUTER TO FACTORY-SETTINGS
To Reset the computer to default factory settings, use a pencil and press the “AC”-button on underside of the computer.
ATTENTION: This action will delete all your data and all your settings for wheelsize, clock, odometer will be reset to factory settings.
4. Mounting and Settings
4.1 INSTALLATION OF BATTERY IN COMPUTER
To prolong battery life, the A8 will come without the battery being installed. The VDO A8 needs a battery 3V-Type CR 2032. Batteries are
available at your dealer (VDO-part no.#1013). Battery life time is around 12 months at normal use.
Watch Out: In case of malfunction please check the battery first before you start a warranty complaint.
STEP 1 Remove the battery door with a suitable coin
STEP 2 Place the batter y in the battery chamber. PLUS+-pole visible. Be careful when installing the battery
STEP 3 3 Reinstall the batter y cap, making sure that the rubber O-ring does not get pinched or distorted.
STEP 4 Tighten the battery door firmly with a suitable coin.
IMPORTANT: During battery replacement all data and all settings will be stored for around 20 Seconds. To save your data,
Tip: Buy replacement battery in time. To save your data and settings replace the battery in time. Before replacing the battery we recommend
to take note of your Wheelsize Setting and Odometer-data.
Watch Out: If for some reason the screen is blank or shows an irregular display after a battery change, press the AC button on the backside of
the computer. This action will delete all data and all settings and requires new settings of Wheelsize, Clock and Odometer.
not to damage the battery contact.
WATCH OUT: If O-ring gets pinched or distorted, this will compromise the unit’s watertight seal.
!
replace the battery within that 20 seconds, otherwise all settings for Wheelsize, Clock and Odometer need to be re-done.
cy of 0.1 digits.
s) = actual speed higher than average speed
t)= actual speed lower than average speed
re-starts at 000.00. Values for ATM, AVS and MXS will simultaneously be reset to Zero.
use. Only the Clock is shown.The computer will automatically restart as soon as it receives
input from the speed sensor, or when any button is pressed.
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*Watch out: old batteries require special disposal
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Please read instructions for end-off-life disposal treatment
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AC-button
Battery
WS in mm / inch
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CYCLECOMPUTING
Instruction manual A8
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5. Programming of computer
To show Speed and calculate Trip Distance and the other data, your VDO A8 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.
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
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
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
STEP 3 Measure the distance between the marks in millimetres or inches (1 inch = 25.4mm). This value is your wheel size = wheel
5.2 SELECTION OF km OR m-READING
The VDO A8 can show speed and all related data either in km or Miles. 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 A8 will now show the set-mode for the wheelsize = wheel
5.3 PROGRAMMING THE WHEELSIZE
After pressing SET-button to confirm km or m selection, the A8 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 A8 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 A8.
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.
the bottom (6 o’clock position). Make a mark on the floor to indicate the valve location.
mark on the floor to indicate this valve location.
circumference.
circumference.
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
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MINIMUM WS: 100 mm / 3,94“
MAXIMUM WS: 3999 mm / 157,44“
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