TM: Riding Time 0H00M00S-19H59M59S, 1 Second, +/- 0.05%
The TM totals the riding time from the last RESET operation.
AVG: Average Speed 0.0–199.9KM/h (120.0 M/h), 0.1KM/h (M/h), +/- 0.1%
1. It is calculated from the DST divided by the TM; the average data counted is from the last
2. It displays an "Err" symbol when either the TM is over 100 hours or the DST is over
1,000 km (or miles). Reset the unit in order to restart.
MAX: Maximum Speed 0.0–199.9KM/h (120.0 M/h), 0.1KM/h (M/h), +/- 1%
It shows the highest speed from the last RESET operation.
TTM: Total Riding Time 0H00M–1999H59M, 1 Minute, +/- 0.05%
The TTM totals the riding time from the last ALL CLEAR operation.
ODO: Odometer 0.0–19999.9Km (Miles), 0.1Km (Mile), +/- 0.1%
The ODO accumulates the total distance as long as the bike is moving. The ODO data can be
cleared by ALL CLEAR operation only.
1. Auto-Scanning Display Mode
Press the MODE button till the “ ” symbol is displayed. The computer will change the •
DST, , TM, AVG, MAX, TTM and ODO display modes in a loop sequence automatically
Press the MODE button to turn off the “ ” symbol and select a desired display mode; •
the computer will stop the auto-scanning display operation and the display mode is set.
It flashes the “ ” speed pacer arrow while the current speed is higher than the average speed
and the down arrow “ ” flickers conversely.
1. The computer will automatically begin counting , ODO, DST, MAX, TTM, TM and AVG
data upon riding and stop counting data when riding is stopped.
2. The flickering symbol “ ” indicates that the computer is at START status.
DST CLOCK TM AVG MAX TTM ODO / ODO
8 FUNCTIONS: SPD, DST, ODO, CLK, AVG, MAX, TM, SCAN.
10 FUNCTIONS: SPD, DST, ODO, CLK, AVG, MAX, TM, TTM, SCAN, SPEED PACER.
MAIN UNIT SETUP (Fig.1) English
1. Be sure to press the All Clear (AC) key to clear all stored data and initiate the „
computer before using it or when replacing battery. Otherwise the unit may malfunction.
2. The LCD segments will be tested automatically after the All Clear key is pressed.
3. Press the “MODE” button to stop the LCD test, then the flickering “KM/h” and •
“c2155” will be displayed.
1). Press the “MODE” button to select “KM/h” or “M/h”(Mile/h).•
2). Hold the “MODE” button till the flickering digit is changed to the digit “2” of the •
c2155 to recognize either KM/h or M/h as desired.
2. CIRCUMFERENCE DATA SETTING
1). The default is set at 2155mm. Measure the value for your wheel ( ) or refer to Fig. a
the quick table provided in the manual for your bicycle. ( )Fig. b
2). A quick press of the “MODE” button advances the flickering digit by 1.•
3). To change the flickering digit, hold down the “MODE” button till the flickering digit •
4). When set up is complete, hold down the "mode" button for 6 seconds until main
: Current Speed 0.0–199.9KM/h (120.0 M/h), 0.1KM/h (M/h), +/- 1%
The current speed is always displayed on the 4 digits set when riding.
DST: Trip Distance 0.00–999.99Km (Miles), 0.01Km (Mile), +/- 0.01%
The DST function accumulates the distance data from the last RESET operation as long
as the bicycle is being ridden.
: 12HR Clock 1H00M00S-12H59M59S, 1 Second, +/- 0.05%
It displays the current time in 12HR clock.
To preserve battery, this computer will automatically switch off when it has not been used for about
10 minutes. The power will be turned on automatically by riding the bicycle or by pressing the button.
Quickly press this button to move in a loop sequence from one basic function screen to another.
ALL CLEAR OPERATION (Initiate the Computer)
key to initiate the computer or use ALL CLEAR if any irregular
data appears. It will clear all stored data.
1. Hold down the “MODE” button till the LCD digit is blank, then release it. The computer •
will RESET the DST, TM, AVG, MAX.
2. It cannot reset , TTM and ODO data.
1. Change the LCD display to ODO screen, hold down the “MODE” button till (about 6 •
seconds) it jumps into the calibrating screen.
2. Refer to the main unit setup process to adjust the circumference.
3. Hold down the “MODE” button till (about 6 seconds) it jumps out the recalibration mode to •
store the desired data and complete recalibration.
12HR CLOCK SETTING (Fig. 4)
1. Change the LCD display to “ ” screen.
2. Press the “MODE” button till (about 6 seconds) it jumps into the clock adjusting screen to •
3. A quick press of the “MODE” button advances the flickering digit by 1.•
4. To change the flickering digit, hold down the “MODE” button
till the flickering digit moves
5. Hold down the “MODE” button till (about 6 seconds) it jumps out the setting to store the •
desired data and complete clock setting.
1. When the brightness of the LCD display is dim, it means that the battery is nearly exhausted.
2. Replace a new LR44 (Cross reference type A76, AG13 or V13GA) battery in
the compartment on the back of the computer with the positive (+) pole toward the battery
Check the following before taking unit for repair.
1. This computer can be used in the rain but should not be used under water.
2. Don’t leave the main unit exposed to direct sunlight when not riding the bike.
3. Don’t disassemble the main unit or it’s accessories.
4. Check relative position and gap of sensor and magnet periodically.
5. Clean the contacts of the bracket and the bottom of the main unit periodically.
6. Don’t use thinner, alcohol or benzine to clean the main unit or its accessories when they
7. Remember to pay attention to the road while riding.
2. Be sure that the positive pole of
the battery is facing the battery cap.
1. Refer to the adjusting procedure
and complete the adjustment.
3. Refer to (Fig. B3) and (Fig. B4) and
4. Repair or replace wire.
5. Refer to "CALIBRATION" and enter
Refer to the "MAIN UNIT SETUP" and
initiate the computer again.
Place main unit in the shade to return
No adverse effect on data.
Unit will return to normal state when
2. Is there incorrect battery
1. Is it at the recalibrating or 12HR
2. Are the contacts between the
main unit and the bracket poor?
3. Are the relative positions and gap
of sensor and magnet correct?
5. Is the circumference correct?
Did you leave main unit under
direct sunlight when not riding
the bike for a long time?
Is the temperature below 0°C
POPULAR TIRE CIRCUMFERENCE REFERENCE TABLE
27 Inch (700x32c) 2155 mm
151624 Halfords 8 Function Computer
151632 Halfords 10 Function Computer
