Our cyclecomputer database is your starting point when looking for information on cyclecomputers. It links to owner's manuals for most cyclecomputers. Sometimes we had to work without a manual, or have additional information. That information is on this page if the brand name begins with C through T, except for Cateye, which got its own page.

Look for similarities in appearance and function when trying instructions for a computer not on our list. Many bicycle computers are rebranded. Please let us know of rebranded models which you have identified.

Old versions of manufacturers' Web sites preserved on the Internet Archive may list older models. A Web search on the make and model, plus "manual" or "instructions" sometimes turns up information posted by an owner. If you have information on a model not covered here, please send it in.

Calibration: D

Manual

Note:

Ciclomaster computers have an unusual feature. They incorporate a small capacitor to maintain short-term memory while the battery is being changed, so if you are reasonably quick about it you can change the battery without losing the calibration, and even maintain the stored odometer mileage.

Entering "Set" mode:

1. Press and hold both "SET" and "MODE" buttoms for 5 seconds.
2. Use "SET" button to select miles or kilometers.
3. Then press "MODE"

Changing setting:

Set calibration with "SET" key

Exiting "Set" mode:

Press "MODE".
If altitude module included, press "SET" again with bike on level surface to calibrate altimeter.

Calibration: F

Entering "Set" mode:

Press and hold both buttons for 3 seconds.

Changing setting:

1. Press "MODE" button to stop LCD test; "Km/h" will flash.
2. Use "MODE" button to switch between miles and kilometers.
3. Press and hold "MODE" button to select units and go on to first digit of calibration number (default: 2155)
4. Enter the required calibration number by pressing the "MODE" button to change the values and holding the "MODE" button to move to the next digit.
5. When the calibration number is entered press the SET button to complete the setup.

Exiting "Set" mode:

push the [button] button.

Calibration: D x 1.24274 (miles) / D x 2 (Km)

Instructions to replace battery, and (incorrect?) calibration table in German

Battery: CR 2032

 

Entering "Set" mode:

Press and hold the button for 5 seconds.

Changing setting:

Press button to advance number

Exiting "Set" mode:

Automatic after 10 seconds of inactivity.

If you change the battery in less than 30 seconds, you can save your data.
This unit uses the wheel diameter in mm for a calibration number for km.
This number times .621 is used for mile readings.
Use chart D, but multiply the value listed by 2 for km, or by 1.242 for miles.

Calibration: wheel diameter (inches), or circumference/3.14

See the scanned instruction sheet at:

https://www.sheldonbrown.com/cyclecomputers/Raleigh/raleigh-as816.jpg

(Thanks to Jim Thompson)

Calibration: No information but probably F

Entering "Set" mode:

Press and hold both buttons simultaneously, until all Eights are displayed to reset computer. Display then…hopefully???…. indicates wheel size automatically. Right button adjusts digits. Left button sets selection.

Changing setting:

1. KM/Miles. Right to change. Left, sets selection.
2. Run through all the remaining functions using Mode and Set.
3. To set 12/24 hour, and time. Hold down left button when time is displayed. Right button to change 12/24 then, left, set. Repeat for time.
4. Temperature, when displayed. Hold set. Change with right button, C-F. Then set.

 

Battery: Size "J" rectangular.

(This is a rare battery, you may be able to find it in a camera shop, it was used in some older pocket cameras.)

Entering "SET" mode:

Press and hold "SET" button

Changing setting:

Use "CAD" button while holding "SET"

Exiting "SET" mode:

Release both buttons.

Calibration:

Batteries: (2 MS76/SR44 silver)

 

Entering "Set" mode to revise wheel size without losing mileage:

1. Use "MODE" button to get to "ODO" mode.
2. Press "SET" for 2 seconds.. The wheel calibration number will be displayed with the first digit flashing.

Changing setting:

1. The "ALARM" button ("MODE" button on Monitor 2) will advance the flashing digit.
2. The "SET" button will select the other digits in turn, which can also be advanced by the "ALARM" (or "MODE") button.

Exiting "Set" mode:

Press the "SET" button again.

Calibration:

• Schwinn Paramount Series 8: F
• Vetta Cycle Computer, Schwinn Paramount Series 10: E (Miles), F (Km)

This is basically the same as the Vetta Cyclocomputer

Calibration: F

Battery: CR2032

Setup instructions:

1. Press right button to select ODO screen.
2. Hold both buttons 3 seconds, until hour blinks
3. Adjust current (blinking) number with right button
4. move to next number using left button.
5. Hour is 12 hour clock with no am/pm
6. Minute is set when left button pressed
7. Choose MPH or KPH with right button
8. cad is cadence, blinking is off, solid is on and enables the cadence menu item (useless without 2nd sensor)
9. wheel circumference in mm is the last parameter
10. press left button one more time to exit

This appears to be a variant on the Vetta RT77 or C20.
(Thanks to BrianX)

This computer is integrated with special Shimano brake/shift levers with control buttons and so it shows the gear in use -- a clever idea with problems in execution: for one thing, the computer only works with those levers. For another, it is posssible unintentionally to delete trip data by pressing the on-off button on the left brake hood. This problem can be addressed by placing a washer around the button so it can't be pressed accidentally. Then it is necessary to peel back the rubber hood and depress the button with a pen tip or the like.

Calibration: F

Instruction Manual (first page is blank, scroll down).

Battery: CR2032 lithium

 

Entering "Set" mode:

1. Select any mode except CLK
2. Press and hold B button (bottom of unit) for 5 seconds

Changing setting:

1. Press button A to select mile/h or km/h
2. Press button B to accept selection and go on to wheel calibration
3. Repeat sequence to set, in turn:
   1. Wheel calibration number
   2. Chainwheel sizes, largest first
      Note, active value will be flashing at the lower left side of the speed. After the first chainwheel has been set, and you move on to the second, the previous selected chainwheel size will be displayed on the right side for reference.
   3. Rear sprocket sizes, smallest first
   4. Once all sprocket sizes have been set, press and hold button B for 5 seconds.
4. Select "111" for standard rear derailer, or "222" for "Rapid Rise" (reverse action) rear derailer.
5. Set 24 hour clock

Exiting "Set" mode:

push the B button after setting clock.

Calibration: E (Miles), F (Km)

Owner's manual

Battery: 2 SR44 or MS76 silver batteries.

A76 Alkaline batteries will work, but they don't last very long.

Reset:

1. Press lower button to reach "Trip" mode
2. Press and hold recessed button on bottom for 5 seconds

Changing setting:

1. Press lower button to select which digit is to be changed.
2. The active digit will flash.
3. Press upper button to advance the flashing digit.

Exiting "Set" mode:

push the recessed button on the bottom.

When new batteries have been installed, this unit comes up in odometer set mode, so you can re-enter mileage readings from previous batteries.

Calibration: tire size menu

Battery: CR2032

 

Entering "Set" mode:

1. Use "Mode" (right) button to get to "Odo"
2. Hold "Function" key and tap "Mode" once. Km/h-m/h will alternate
3. Push F to select units.
4. Next mode is programmable odometer.
5. Next mode is wheel size, select from menu.

Changing setting:

1. [step 1]

Exiting "Set" mode:

push the [button] button.

Calibration: F

Battery: 2x CR2032

Manual is online as video.

Video without narration

Yet another

And another with narration in English

Here is one style of cyclecomputer which is sold under so many brand names that we quit trying to list them all. They are rebranded Sunding. If color schemes are consistent, they are:

• SD-548C if wireless (gray border around display, as shown)
• SD-546C if wireless with backlight (gray border)
• SD-548A if wired, 15 functions (dark red border)
• SD-548B if wired, 13 functions (dark red border)
• SD-546AE if wired with backlight, 14 functions (dark red border)
• SD-546A if wired with backlight, 23 functions (dark red border)

Calibration: F

This is a rebranded Sunding SD-558A with minor differences.

Calibration: F

Owner's manual for Sensor

Owner's manual for Sensor II

Entering "Set" mode:

In any mode EXCEPT clock mode, press and hold both buttons for about 4 seconds, or until the M/h or Km/h symbol appears.

Changing setting:

1. Press LEFT button until desired units (M/h or Km/h) are selected.
2. Press RIGHT button to accept. Current calibration number will appear, with one digit flashing.
3. Press LEFT button to change the flashing digit, press RIGHT button to accept flashing digit and go to next digit.
4. After the 4th digit has been selected, pressing the RIGHT button will take you to the settable odometer screen, where you can use the same procedure to restore mileage values lost during battery change.

Exiting "Set" mode:

Press and hold the right button for 5 seconds if you wish to bypass the settable odometer stage.

Clock setting:

1. In clock mode, press and hold both buttons for about 4 seconds, or until a flashing 12 or 24 appears. (There will be no mode icon for "clock," but you will see hours and minutes with a flashing colon.
2. Press LEFT button until desired mode (12 hour/24 hour) is selected.
3. Press RIGHT button to accept. Current time setting will appear, with hours flashing.
4. Press LEFT button to change the hour, press RIGHT button to accept and go to minutes.

Calibration: F

See Owners's manual in JPG format

Calibration: F

See Owners's manual in PDF format