VDO CYTEC C 15 User manual

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C15

ETRTO 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 2070 81,5
50-559 26x1,9 2089 82,2
54-559 26x2,00 2114 83,2
57-559 26x2,125 2133 84,0
37-590 26x1 3/8 2105 82,9
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
ETRTO WS in mm KMH WS in inch MPH

screw
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INSTALLATION AND OPERATION MANUAL - VDO CYTEC C 15
Preface
Thank you for buying a VDO CYTEC bicycle computer. The more familiar you get with this model, the more enjoyable your trips
are going to be.
Please read thoroughly all the information provided in this manual. You are getting important and useful hints for operation to make
you fully benefit from all the technical features of your VDO CYTEC bicycle computer.
We wish you enjoyable trips and rides on your bike with VDO CYTEC
CYCLE PARTS GMBH
Mounting the system
1. Mounting the handlebar holder
The handlebar holder fits handlebars of any diameter. Before mounting the system, decide if you will be using your left or right hand
to operate the computer and then mount the handlebar holder on the respective side. Position the handlebar holder, insert the strap
and adjust it by tightening the screw.
Warning: Before tightening the handlebar holder, make sure to adjust the position of the computer head (inclination) when the LCD-
display is best visible for you. Only when you find the best position tighten the screw.

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2. Mounting the speed transmitter
The sensor should be mounted on the
same side of the fork as the holder is
on the handlebar.
Watch out: Do not tighten the cable
ties yet! Accurately position the spoke
magnet and the sensor first, then
tighten the cable ties.
3. Mounting the spoke magnet
Distance between magnet and
sensor should be approx. 1-5 mm.

1-5mm
1-5mm
1.LOCK 2.CLICK
1.PRESS
2.UNLOCK
LOCK
UNLOCK
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In case this distance is not
achievable in the current positioning,
slide the sensor and the magnet on
the fork or spoke accordingly.
4. Twist-Click mounting of computer onto holder
The Twist-Click mounting has been exclusively developed for the new line of VDO
CYTEC computers. The computerhead is put onto the handlebar and by a right turn
of the computerhead (TWIST) fixed to the holder (CLICK).
It is just as easy to remove the computerhead from the handlebar holder.
Slightly push the computerhead down, twist it to the left, remove computerhead from
handlebar holder.

OPEN CLOSE
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5. Installing battery into computer head
To save battery power, your VDO CYTEC comes with the battery not yet fitted. Prior to initial use you have to install the battery first.
If you find the computer is not functioning properly after a battery change, push the AC-button (Auto Clear) on the rear side of the
computer to reset.

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6. Information features of your VDO CYTEC C 15
Your VDO CYTEC C 15 provides you with following information:
KMH-MPH current speed indicated in either KMH or MPH, featuring automatic conversion into MPH
TRP trip counter, counts your trip distance up to 999,99 km or miles.
RID trip timer, keeps track of the actual riding time featuring automatic start/stop function, up to 9:59:59 (hrs:min:sec)
STP manual stop watch, counting up to 9:59:59 (hrs:min:sec)
AVS average speed, accurate to two decimal points
MAX maximum speed, achieved during a ride, accurate to two decimal points
permanent comparison of current and average speed. Deviations are indicated by up/down arrows in the display
TCNT Second trip counter featuring a preset mode, intended for use while following road-book instructions.
CLK clock with 12 h or 24 h selectable display mode
TOT total riding time, adding up all riding times of individual rides RID. Resetable to zero individually, i.e. per month, per 
week etc.
ODO 1 odometer 1, counting distances ridden on bicycle 1, (wheelsize 1) up to 99,999 KM or M
ODO 2 odometer 2, counting distances ridden on bicycle 2, (wheelsize 2) up to 99,999 KM or M
TOTODO total odometer, adding up values of odometers 1and 2, revealing your total distance traveled on both bikes up to 
99,999 KM or M
FRE FREEZE-mode, the frame at passing the finish line becomes "frozen" and further impulses are not indicated. Your 
freeze-frame data can be read back from memory later
WS 1+WS 2 two wheelsizes for two different bicycles selectable

Function
TRP
RID
AVS
STP
MAX
Mode 1
Function
TCNT
CLK
TOT
ODO1
ODO2
TOTODO
Mode 2
SS
Function
STP-Start/Stop
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7. Operating your VDO CYTEC C 15
Button / Key Covering
Your VDO CYTEC C 15 has 3buttons / keys
Mode 1, Mode 2 and SS

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These buttons / keys have several functions.
All functions of the respective buttons / keys outlined in the following chart below.
Your display in Button / Key Length of What is going on?
dicates following to be pushed pushing the
information button / key
TRP-AVS-RID- MODE 1 brief (0.1 sec) next information from MODE 1 is indicated
STP-MAX
TCNT-CLK-TOT- MODE 1 brief (0.1 sec) computer changes display information from MODE 2 data to
ODO1-ODO2- TRP-data of MODE 1
TOTODO
TRP-AVS-RID MODE 1 normal (1.5 sec) TRP-AVS-RID are automatically rotated, one at a time displayed  
for 1.5 sec.
TRP MODE 1 long (5 sec) enter set-up mode for wheelsizes
CLK MODE 1 long (5 sec) enter set-up mode for clock is
ODO 1-ODO 2 MODE 1 long (5 sec) enter set-up mode for odometers
RID-AVS-STP-MAX MODE 1 long (5 sec) switching from wheelsize 1 to wheelsize 2 and vice-versa
TCNT MODE 1 long (5 sec.) Set-up mode for TCNT (second trip counter) is called into display
TCNT-CLK-TOT- MODE 2 brief (0.1 sec) next information from MODE 2 is indicated
ODO1-ODO2-
TOTODO
TRP-AVS-RID- MODE 2 brief (0.1 sec) computer changes display information from MODE 1 data to
STP-MAX MODE 2 data. TCNT always being the first information indicated
TRP-AVS-RID-MAX MODE 2 long (5 sec) TRP-AVS-RID-MAX information reset to zero. 
TCNT MODE 2 long (5 sec.) Second trip counter TCNT is being reset to zero
TOT MODE 2 long (5 sec) total riding time counter reset to zero
STP MODE 2 long (5 sec) stop watch STP reset to zero
any of the following MODE 1 brief (0.1 sec) FREEZE function either activated or deactivated, computer either
information: + stops or picks up functioning in regular modes.
TRP-AVS-RID-STP- MODE 2
MAX-TCNT-CLK-
TOT-ODO1-ODO2-
TOTODO
STP SS brief (0.1 sec) either start or stop run of stop watch

SCROLL
Press MODE 1 1,5 sec.
Start Scroll
Press MODE 2 5sec.
Reset
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8. Scroll function
To provide any information at a glance, your VDO CYTEC C 15 features
a scroll function. Calling up the scroll function automatically displays
information for a period of 1.5 sec. Scroll function may be called upon if any
of the following information is on display: TRP-AVS-RID. Scroll function is
activated by pressing the MODE 1 button for 1.5 sec.
9. Second trip counter TCNT
Your VDO CYTEC features a second trip counter TCNT. This second trip
counter allows you to easily follow road-book instructions. The TCNT may be
preset to an individual value from which it then counts up. In case you have
missed a turning point in your road-book tour, you may return to the tour leg
where you have gotten lost, re-enter the correct value and keep going from there.
Set-up mode for your second trip counter TCNT
Step 1: Call TCNT information into display.
Step 2: Press MODE 1 key for 3 sec. Display shows "TCNT" and a flashing number.
Step 3: By pressing MODE 2 key, the number can be changed.
Step 4: By pressing MODE1 key you proceed to the next number, which you can 
change by pressing MODE 2 key.
Step 5: Once you have entered the last number for your TCNT, exit set-up mode by 
pressing MODE 1 key for 3 sec..
Watch out: When you exit set-up without having completed entering your data, the 
computer may well work with faulty values leading to misinformation in 
your display.
Reset TCNT to zero
The second trip counter TCNT is reset to zero by pressing MODE 2 key for 5 sec. Before resetting to zero, make sure that TCNT
information is called into display.
Watch out: Pressing the MODE 2 key for 5 sec. without TCNT data being displayed probably resets your TRP-RID-AVS-MAX 
data to zero.

SS START/STOP Press MODE 2 5sec.
Reset
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10. Manual stop-watch STP
Your VDO CYTEC C 15 features a manual stop-watch.With information STP being displayed, you may operate your
stop-watch with the SS-button.
SS press when STP is displayed = starting the stop-watch
SS press again = interrupt the stop-watch
SS press again = stop watch continues
11. FREEZE-function
Your VDO CYTEC C 15 features a FREEZE-function. Using this function, as you pass the finish line "freezes" your screen and
further impulses are not processed. For triathletes, road racers and for interval-exercise the FREEZE-function provides precise
data, i.e., when passing the finish line, distance, time and average speed values that are being stored during use.
Watch out: Pressing the MODE
2 button for 5 sec. without STP
data being displayed resets your
TRP-AVS-RID-MAX data to zero.

to aktivate
to deactivate
MODE 1 +MODE 2

Your current speed is
faster than
your average
speed. Accuracy
+/- 1 KMH/MPH
You are currently riding
as fast as your average
speed. Accuracy
+/- 1 KMH/MPH
Your current speed is
slower than your average
speed. Accuracy
+/- 1 KMH/MPH
Activating the FREEZE-function
The FREEZE-function can be activated from any information displayed by simultaneously pressing MODE 1 and MODE 2
buttons for 0.1 sec. Having activated the FREEZE-function, the letters FRE show up in the upper LCD-segment. Your
computer does not process any further impulses, only the clock CLK keeps going.
Interrogating information in FREEZE-function
Any information can be accessed when you are in FREEZE-mode.
Deactivating of FREEZE-function - returning to normal modes
The FREEZE-function is deactivated by simultaneously pressing MODE 1 and MODE 2
buttons for 0.1 sec. Letters FRE in display will disappear. The computer will revert back
to normal mode again and speed impulses will be processed.
12. Comparison of current and average speed
Your VDO CYTEC C 15 compares your current speed with your average speed. The
outcome of this comparison can be seen in your display by the use of symbols. No
matter which information is currently displayed, this data keeps you updated on the
relation of your current speed and your average speed.
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13. Set-up mode
Your VDO CYTEC C 15 features the following set-up procedures
wheelsize 1 = WS1 set-up starts out of TRP in display
wheelsize 2 = WS2 set-up starts out of TRP in display
clock = CLK set-up starts out of CLK in display
odometers = ODO1,ODO2 set-up starts out of ODO1, ODO2 in display
Trip Counter=TCNT set up starts out of TCNT in display
No matter which set-up mode is used for your VDO CYTEC , the procedure is the same.
You can start the set-up mode for a certain display by pressing the MODE 1 button for 5 sec. With this MODE button you may
also exit the set-up mode at any time.
Once the set-up mode is activated, MODE 1 and MODE 2 buttons are covered with following instructions:
MODE1 changing from one enter display to the next enter display
MODE2 selection of figure to be entered, changing from KMH to MPH mode
14. Selecting the wheelsize
Your VDO CYTEC C 15 can work with two different wheelsizes (WS1 or WS2), i.e. one wheelsize for your road bike the other
one for your mountain bike. When using the respective bike you can just switch to the proper wheelsize.
Wheelsize is only selectable if any of the following information is displayed: AVS-RID-STP-MAX
The currently active wheelsize is indicated in the display by WS 1 or WS 2. You can switch from wheelsize 1 (WS 1) to
wheelsize 2 (WS 2) and vice-versa by pressing the MODE 1 button for 5 sec.

WS in mm / inch
1x
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15. Entering your wheelsize
You may enter two different wheelsizes into your VDO CYTEC C 15, i.e. one wheelsize for your street bike and another one
for your mountain bike.
Your VDO CYTEC identifies different wheelsizes as WS 1 = wheelsize 1 and WS 2 = wheelsize 2.
following defaults are entered
wheelsize 1 = WS1 = 2155 mm
wheelsize 2 = WS2 = 2000 mm
Watch out: Above defaults are automatically applied after a battery change.
After a battery change, the correct wheelsizes for your bikes have to be re-entered
How is the wheelsize precisely determined?
Place the front wheel of your bike with the valve at the bottom, mark this position with a line and push your bike ahead until
exactly one rotation of the front wheel is completed. Draw another line where the valve now is. Take a ruler and measure the
distance between marks 1 and 2 which reflects the wheelsize = wheel-circumference. The figure measured (inches or mm)
is the wheelsize to be entered into your computer.

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Programming (setting up) your wheelsize
Step 1:  Call TRP information in your display.
Step 2:  Press MODE 1 button for 5 sec. "WS1" is displayed along with an alternating flashing symbol for KMH and MPH.
Step 3:  By pressing the MODE 2 button you can choose whether you want MPH or KMH readout on your display.
Watch out: Your choice of either MPH or KMH applies for both wheelsizes WS 1 and WS 2.
Step 4:  Once you have chosen your measuring unit, continue by pressing the MODE 1 button briefly (0.1 sec). Now, either 
the default value or the wheelsize value previously entered (WS 1) is displayed with the last number flashing.
Step 5:  With buttons MODE 1 and MODE 2 you can enter wheelsize 1 previously determined. Then you enter your 
measurements for wheelsize 2 (see set-up mode).
Watch out: The computer wants you to enter your wheelsizes one at a time, first WS 1 , then WS 2. You may exit setting up 
wheelsizes at any time by pressing the MODE 1 button for 5 sec.
Step 6:  Once you have entered the last number for wheelsize 2, the computer automatically goes back to normal mode. 
You may also exit the set-up mode at any time by pressing the MODE 1 button.
Watch out: When you exit set-up without having completed entering your data, the computer may well work with faulty 
values leading to misinformation in your display.

MODE 2 0,1sec.
to change from
KMH to MPH
MODE 2 0,1sec.
to increase
MODE 1 5sec. MODE 1 5sec.
to quit
MODE 1 0,1sec.
switch to next
MODE 1 0,1sec.
switch to next
MODE 1 0,1sec.
switch to next
MODE 1 0,1sec.
switch to next
MODE 2
to increase
to change from
KMH to MPH
MODE 1
to start
to switch
to quit
MODE 1 0,1sec.
switch to next
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MODE 2 0,1sec.
MODE 2
MODE 1 0,1sec.
switch to next
MODE 2 0,1sec.
to increase MODE 1 0,1sec.
switch to next
MODE 1 5sec.
to quit
MODE 1 5sec.
to start
MODE 1 0,1sec.
switch to next
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16. Setting the clock CLK
Your VDO CYTEC C 15 features a clock with hour and minute display. 12 h or 24 h display selectable.
To access the clock set-up mode proceed as follows:
Step 1: call in the CLK
information into your
display
Step 2: Press the
MODE 1 button for
5 sec. The set-up mode
for the clock starts. You
will either see the figure
"24" or "12" flashing
reflecting the
hour-mode
programmed. To set
up your clock use
MODE 1 and
MODE 2 buttons
(see set-up mode).

MODE 1 5sec.
to quit
MODE 1 0,1sec.
switch to next
MODE 2 0,1sec.
to increase
START
MODE 1 5sec.
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17. Programming (setting-up) your odometers ODO1 / ODO2
You can enter individual odometer values into your VDO CYTEC C 15 at any time, i.e. transferring data from your old computer into
your new VDO CYTEC C 15 or after a battery change.
Watch out: after a battery change, your data for totals ODO 1, ODO 2 and TOTODO are reset to zero.
TIP: If you want to re-enter your totals after a
battery change, take down the values for ODO1
and ODO 2 before removing the battery.
You may have your VDO CYTEC C 15
manage your total for wheelsize 1 in ODO 1 and
your total for wheelsize 2 in ODO 2. The
computer then automatically sums up the total out
of ODO 1 and ODO 2 in TOTODO.
Set-up procedure for entering totals is similar for
ODO 1 or ODO 2.
Step 1: Call information for ODO 1 (if you want
to program ODO 1) or ODO 2 (if you want to
program ODO 2) into your display.
Step 2: Start the set-up mode for
odometers by pressing the MODE 1 button for
5 sec. The last number is flashing.
Entering data is done by MODE 1 and MODE 2 buttons. (see set-up mode)

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18. Resetting information to zero
The following information may be reset to zero with your VDO CYTEC C 15.
TRP-RID-AVS-MAX These information here is simultaneously reset to zero.
TCNT This information is singly reset to zero.
TOT This information is singly reset to zero.
STP This information is singly reset to zero.
Information must be reset to zero by pressing the MODE 2 button for 5 sec.
Watch out: Take care that the exact information to be reset is on display.
If either of the following information, TRP, RID, AVS or MAX are displayed and you want to reset to zero by pressing the
MODE 2 button, be aware that the remaining three information are simultaneously zeroed.

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malfunction possible cause solutions
irregular LCD readout
(i.e. after battery change)
speed display does not appear check for proper distance between 
sensor and magnet 
cable from sensor to computer broken check cable and replace if necessary  
computerhead is incorrectly twisted on  place computerhead on handlebar 
holder and twist until detent (CLICK) 
no wheelsize entered enter your wheelsize
display fades or disappears battery in computer empty check battery power and replace it if 
necessary 
temperatures below 5°C (40°F) dull 
display readout
computer software is not running
smoothly press AC-button at the rear of computer
head
readjusting distance between sensor
and magnet
handlebar holder
back in normal temperatures, display
picks up working correctly
21. Troubleshooting
This chart outlines possible malfunctions, their causes and solutions.
19. Stand-by-mode
Your computer VDO CYTEC C 15 features a stand-by-mode in order to save battery power.
Your computer changes into stand-by-mode if it has not received any speed impulses for 5 min or no button has been
pressed in the same period of time.
The time of day (CLK) is still displayed in stand-by-mode, though.
By pressing any button or just continuing your ride, this will end stand-by-mode and return you to the appropriate mode.
20. Battery change
Tip:
Take down your totals and wheelsizes prior to battery change 1. Changing the battery in the computer head. See 5.
In case the computer is not properly functioning after a battery change, push the AC-button (Auto Clear) on the
rear side of the computer to reset.
Watch out:old batteries require special disposal