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dZ4L-C3

Wired Cycle computer with cadence 

 

Owner’s Manual

SPEED MAGNET INSTALLATION

INTRODUCTION

Congratulations on your purchase of the dZ4L-C3 wired cycle 

computer by FILZER.  Packed with all the features that a 

professional rider needs to keep track of during a workout 

including cadence. This computer is a perfect training tool for 

any cyclist.

Functions

1

Cadence (CAD RPM)

Average Cadence (AVG RPM)

Speedometer (SPD) (0 TO 99.9 Km/hr or M/hr)

Tripometer (DST) (0 to 999.99 Km or M)

Odometer (ODO) (Up to 9999.9 Km or M)

Auto trip timer (TM) (99:59:59)

Maximum Speed (MXS) (0 to 99.9 Km/hr or M/hr)

Clock, 12/24 hour selectable

Average Speed (AVS) (0 to 99.9 Km/hr or M/hr)

Speed Comparator (+ or -)

Programmable Odometer

Auto Scan

BATTERY INSTALLATION

Computer - (Note: Battery is pre-installed) Remove the 

battery cover from the bottom of the computer using a small 

coin. Install the 3V battery with positive (+) pole facing the 

cover (Figure 1a). If the LCD shows irregular figures, take out 

the battery and install again. This will clear and restart the 

computer's microprocessor.

Fig. 1a

Computer battery

(3V/CR2032)

2

small cable ties

for wires

cadence magnet

mounting 

bracket

Wheel magnet

computer battery

(3V/CR2032)

Parts

3

PARTS INSTALLATION LOCATION

Area     - Mounting bracket (handlebar)

Area     - Cadence sensor (left chain stay)

Area     - Speed sensor (left chain stay)

Area     - Cadence magnet (crank)

Area     - Speed Magnet (rear wheel spoke)

4

MOUNTING BRACKET INSTALLATION

5

Attach the mounting bracket to the right side of the handlebar 

with the large cable ties (Figure 3a and 3b).  Make sure the 

mounting bracket is clamped tightly and will not slip on the 

handlebar. Slide the computer onto the mounting bracket until 

it snaps firmly into position.  Press the release button to 

remove the computer (Figure 3c).

SENSORS INSTALLATION

Fig. 4a

Fig. 4b

a) See Figure 4a and 4b for routing of sensors wire.
b) Make sure that there is enough wire clearance so the 

handlebars can rotate fully in both directions without pulling at 

the sensors wire.
c) Route the wire down the frame of your bike and to the left 

chain stay. Do NOT install cable ties yet.

6

7

e) 

Cadence Sensor - 

Once you have determined the 

approximate position of the cadence sensor and magnet - 

loosely put LARGE cable ties on them. The magnet should be 

maximum 2mm from the cadence sensor and magnet. Note: 

for cranks arms that are hollow, you may need to put a spacer 

(not included) behind the cadence magnet to hold it in place. A 

small piece of foam or rolled up black electrical tape will work.
f) 

Cadence Sensor 

Test out the positioning of the cadence 

magnet and sensor by rotating the cranks backwards to see if 

the computer registers a cadence value. If no value is 

registered reposition the sensor and magnet again. Make sure 

the magnet passes over circle arrow on the cadence sensor as 

shown in Figure 5c. Once you have positioned the magnet and 

sensor properly - tighten up the cadence sensor and cadence 

magnet cable ties securely and clip off the ends.
g) 

Speed Sensor

 - Locate the speed sensor (sensor with long 

wire). Without using tie wraps - position the speed sensor on 

the inside face of the left chain stay and the speed magnet on 

a rear wheel spoke. Position the sensor and magnet in such a 

way so that the magnet passes over the circle arrow on the 

sensor as shown in figure 5a and 5d.
h) 

Speed Sensor

 - Once you have determined the 

approximate position of the speed sensor and magnet - 

loosely put LARGE cable ties on the speed sensor and attach 

the speed magnet to the correct spoke.  See Figures 6a and 

6b on how to attach the speed spoke magnet.  The magnet 

should be maximum 2mm from the speed sensor.
i) 

Speed Sensor - 

Test out the positioning of the speed 

magnet and speed sensor by rotating the rear wheel to see if 

the computer registers a speed value. If no value is registered 

reposition the sensor and magnet again. Make sure the 

magnet passes over circle arrow on the speed sensor as 

shown in Figure 5d. Once you have positioned the magnet and 

sensor properly, tighten up the speed sensor cable ties and 

ensure the spoke magnet is attached securely.
j) Secure the rest of the wire securely to the frame of your 

bicycle with the remaining small cable ties. Make sure that 

there are no dangling wires.

8

WHEEL SIZE (WS):

 Before you 

program your computer you need to 

determine your Wheel Size (WS). WS 

is the circumference of the rear wheel 

in mm.  This value is entered into the 

computer in order to calculate speed 

and distance.
While charts provide a quick and easy 

way to get WS, there are no standard 

wheel sizes in the cycling world - i.e. 

the circumference (or Wheel Size = 

WS) of a 700x23 tire will differ from 

one brand of tire to another - so for 

accurate speed and distance values 

on your computer you need to 

measure your wheel circumference.
To obtain WS:

Method 1

: Fast (and not so accurate) 

method - use chart provided.

Method 2

: Most accurate method:

a) See Figure 8.
b) Inflate your tires to their proper 

pressure. 
c) Put a mark on your rear wheel on the outside 

circumference. 
d) Put a mark on the floor. 
e) Put the mark on the wheel on the mark on the floor. 
f) Rotate the wheel one full revolution until the mark on the 

wheel is on the floor again. Mark this location.
g) Measure the distance between the marks on the floor in 

mm. This is the Wheel Size (WS) (i.e. your wheel 

circumference in mm).
h) Write this number down. The value should be between 

1800 and 2200 mm for standard size tires.  The unit can 

accommodate WS values between 100 and 5999 mm.

Fig.8

WS=distance in mm

for one wheel revolution

WS

2

x

x

1

d

W heel Diameter d

WS

26 x 1.0

1913

26 x 1.25

1953

26 x 1.4

2005

26 x 1.5

2010

26 x 1.75

2023

26 x 1.95

2050

26 x 2.0

2055

26 x 2.1

2068

26 x 2.3

2170

700 x 18

2070

700 x 20

2086

700 x 23

2096

700 x 25

2105

700 x 28

2136

700 x 30

2170

27 x 1"

2145

27 x 1 1/8"

2155

27 x 1 1/4"

2161

HOW TO MEASURE WHEEL SIZE

COMPUTER DISPLAY AND FUNCTIONS

DISPLAY: 

There are three main screens. Press the RIGHT 

button to toggle between the three display screens.

Screen 1

Cadence

(RPM)

Speedometer

(SPD)

Speed Comparator

(+ or -)

Tripometer

(DST)

Trip Timer

(TM)

Cadence

(RPM)

Speedometer

(SPD)Speed 

Comparator

(+ or -)

Average Speed

(AVS)

Maximum Speed

(MXS)

Cadence

(RPM)

Speedometer

(SPD)

Speed Comparator

(+ or -)

Clock

(CLK )

Total 

Distance/Odometer

(ODO)

Screen 3

SPEEDOMETER (SPD):

 Instantaneous Speed is displayed on 

the second row. The range of measurement is from 0 to 

99KM/hr (0 to 99M/hr) and accuracy is + /-0.5KM/hr (M/hr).

SPEED COMPARATOR:

 A "+" or "-" sign appears on the 

second row, to the right of the SPD icon. A "+" indicates you 

are traveling faster than your average speed (AVS). A "-" 

indicates you are riding slower than your average speed.

TRIPOMETER (DST):

 Trip distance (DST) is displayed on the 

third row. DST is accumulated automatically with speedometer 

input. To reset DST to zero, go to DST screen (SCAN OFF), 

press and hold the LEFT button for 2 seconds. NOTE: TM and 

AVS will also be reset to zero.

AVERAGE SPEED (AVS):

 Average Speed (AVS) is displayed 

on the third row. AVS is calculated using the Trip Timer and 

Tripometer (AVS = DST/TM). To reset AVS to zero, go to AVS 

screen (SCAN OFF), press and hold the LEFT button for 2 

seconds. NOTE: TM and DST will also be reset to zero.

CLOCK (CLK):

 A 12/24 hour clock is displayed on the third 

row. To adjust CLK, ODO and WS see bottom section on page 

10.

9

10

11

12

TRIP TIMER (TM):

 Trip Timer (TM) is displayed on the bottom 

row. Trip Timer is activated automatically with speedometer 

input (when the rear wheel is turning). It records only the time 

spent actually riding. To reset TM to zero, go to TM screen 

(SCAN OFF), press and hold the LEFT button for 2 seconds. 

NOTE: DST and AVS will also be reset.

MAXIMUM SPEED (MXS):

 Maximum Speed (MXS) is 

displayed on the bottom row. Maximum speed is stored in 

memory and updates only when a higher speed is reached. To 

reset MXS to zero, go to MXS screen (SCAN OFF) press and 

hold the LEFT button for 2 seconds.

ODOMETER (ODO):

 Total distance traveled (ODO) is 

displayed on the bottom row. To adjust CLK, ODO and WS see 

bottom section on page 10.

SCAN MODE (SCAN):

 Scan mode allows you to see all 

screens without pressing any buttons, each screen will be 

displayed for 4 seconds. Press the RIGHT button until the 

SCAN icon is displayed on the left hand side of the 2nd row. 

Press the RIGHT button to stop SCAN mode - note SCAN 

mode is ON only when SCAN is shown on the screen.

13

14

TROUBLE SHOOTING

Problem

Solution

No cadence reading

Verify that the cadence sensor

and cadence magnet are aligned

properly.

Incorrect cadence

value

Verify that the cadence sensor

and cadence magnet are aligned

properly.

No Speedometer 

reading

Incorrect 

speedometer value

Slow display 

response

Temperature outside of operating

limits (32-125°F or 0-55°C ).

No Trip Distance 

reading

Verify that the speed sensor

and speed magnet are aligned

properly.

Display shows  irregular 

figures or blank screen

Re-install computer battery and 

verify that the computer battery is 

good.

Black Display

Temperature too hot or display 

exposed to direct sunlight too 

long.

15

FILZER, Canada
Make in China
See www.filzer.com for other great products by Filzer

Art No.: 

CAW16-T-FL-GB-FILZER-V0 (dZ4L-C-3)

rubber

shim

Figure 3a

Figure 3b

cadence 

sensor - short

speed 

sensor - long

Figure 3c

Press to

release

C

B

D

D

E

B

G

Fig. 2

4

2

3

5

Fig. 5a

Fig. 5b

E

A

B

C

D

A

E

F

large cable ties 

for mount and 

sensor

F

G

Fig. 5c

Fig. 5d

2mm Max

C

Figure 6a

Figure 6b

E

Chain

Stay

G

E

E

A
B
C
D

Speed

Cadance

speed sensor

faces wheel

cadance

magnet

flat

spoke

round

spoke

d) 

Cadence Sensor

 - Locate the cadence sensor (sensor with short wire). Without using 

cable ties - position the cadence sensor on the outside face of the left chain stay and the 

cadence magnet on the inside of the left crank. Position the sensor and magnet in such a 

way so that the magnet passes over the right portion of the sensor as shown in figure 5a 

and 5b.

SETUP/RESET: 

In INITIAL SETUP mode you can set WHEEL SIZE 

(WS), KM/MILE, 12/24 hour clock and clock time.

 

Press and hold 

the LEFT and RIGHT buttons for 4 seconds to access initial setup 

mode.  The digits on the bottom row will flash - this is the WHEEL 

SIZE (WS) setup.  

WHEEL SIZE (WS): 

Press the RIGHT button to adjust the value of 

the first digit of WS. Once you have entered the correct value press 

the LEFT button to advance to the next digit. Repeat for all four 

digits. Press the LEFT button to confirm and advance to KM/MILE 

setup.

KM/MILE SELECTION (12/24): 

Km/Miles units for distance and 

speed will flash.  Press the RIGHT button to toggle between 

kilometre (KM) and miles (M). Press the LEFT button to confirm and 

advance to 12/24 CLOCK setup.

CLOCK (12H/24H):

 A 12 or 24-hour digital clock is displayed on the 

bottom row of the screen. Press the RIGHT key to toggle between 

12 and 24 hour format. Press the LEFT button to confirm and 

advance to clock setup.

CLOCK: 

Press the RIGHT button to advance the hours (hold RIGHT 

button for fast advance). Press the LEFT button to confirm hours. 

Press the RIGHT button to advance minutes (hold RIGHT button for 

fast advance). Press LEFT button to confirm minutes and advance 

to maintenance required setup.

ADJUSTING CLK, ODO and WHEEL SIZE (WS) VALUES AFTER 

SETUP:  

CLK, ODO and WS can be changed after setup.  Go to 

CLK screen.  Press and hold LEFT button for 5 seconds.  CLK hours 

will flash. Press the RIGHT button to advance the hours. Press the 

LEFT button to confirm hours. Press the RIGHT button to advance 

minutes. Press LEFT button to confirm minutes and enter ODO 

setup. To adjust ODO value, press the RIGHT button and then press 

the LEFT button to confirm and select the value. Repeat this -

INITIAL SETUP

CADENCE (CAD):

 Current Cadence (CAD) is shown on the 

top row of the screen. Cadence is the rotational speed of your 

cranks in RPM (revolutions per minute). 

AVERAGE CADENCE (CAD AVG):

 To see CAD AVG press 

the left button and Average Cadence will be displayed for 4 

seconds.

Screen 2

AUTO START/STOP: 

The computer will start automatically 

when your rear wheel starts rotating. In order to conserve the 

battery, the computer will turn off automatically after 5 

minutes.

RESET: 

See top section on page 10.

Verify that the speed sensor

and speed magnet are aligned

properly.

Verify that the speed sensor

and speed magnet are aligned

properly. Verify wheel size (WS) 

value.

5

1

2

3

4

sequence to reach the desired odometer value and enter WS setup. 

To adjust WS value, press the RIGHT button and then press the 

LEFT button to confirm and select the value. Repeat this sequence 

to reach the desired WS value and exit setup.

Use LARGE

cable ties

Use LARGE

cable ties

Use LARGE

cable ties

for sensors

Use LARGE

cable tie

for magnet

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