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Cyclometer Calibration Procedures Part 2

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Sheldon Brown photo
by Sheldon "Buttons" Brown
Spoke Divider

Trek Sensor

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.

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Trek Sonic

See Owners's manual in JPG format

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Trek Sonic 2

See Owners's manual in PDF format

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Vetta Compact Cycle Computer
(Mongoose Compact Cycle Computer)

Battery: 2 SR44 or MS76 silver batteries. A76

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

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

Use a ballpoint pen or other pointed object to press the "WHEEL" button (underneath unit).
The wheel calibration number will be displayed.

Changing setting:
  1. The "SET" button will select which digit is to be changed.
  2. The active digit will flash.
  3. The "WHEEL" button will advance the flashing digit.
Exiting "Set" mode:

Press "TIMER" or "MODE"

Miles/kilometers:

Recessed button on bottom selects between miles and kilometers.

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Vetta Cycle Computer, Schwinn Paramount Series 8, 10

Battery: 2 SR44 or MS76 silver batteries. A76

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

Entering "Set" mode to revise wheel size without losing mileage:
  1. Use "MODE" (RED) button to get to "ODO" mode.
  2. Press "SET" (YELLOW) button for two seconds
Changing setting:
  1. The "SET" button will select the digit to be altered.
  2. The "MODE" button will advance the selected digit.
Exiting "Set" mode:

Press the YELLOW button again.

Miles/kilometers:

After installing a new battery, use "SET" to select "KM/HR" or "M/HR". This is only a label. Reading is inaffected. To change reading between miles and kilometers, appropriate wheel calibration number must be entered.

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Vetta C-5, C-06

Battery: 1 SR44 or MS76 silver battery. A76

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

Setting:
  1. Press the button to get to the "Odometer" mode (">>>" steady)
  2. Press and hold the button for 4 seconds to enter (m/hr)/(km/hr) setting mode.
  3. Press the button when the desired units are displayed. Calibration screen will appear.
  4. After 4 seconds the last digit will begin to flash and rotate change. Press the button when the desired digit is displayed.
  5. Repeat for remaining digits.

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Vetta C-10

Battery 186/LR43
 
Entering "Set" mode to revise wheel size without losing mileage:
  1. Press RIGHT button to get to "Odo" mode.
  2. Press and hold LEFT button for 2 seconds.
  3. Use LEFT button to select digit to change.
  4. Use RIGHT button to advance selected digit.
Exiting "Set" mode:

Push the LEFT button.

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Vetta C-15, C-16

Battery 186/LR43
 
Entering "Set" mode to revise wheel size without losing mileage:
  1. In AVS/ODO mode, press and hold RIGHT button for 2 seconds.
  2. Screen will clear, and M/hr will flash.
  3. Select Miles (M/hr) or Kilometers (Km/h) by pressing the LEFT button.
  4. Press RIGHT button to confirm choice, and move to calibration number setting mode.
  5. Advance the flashing digit with the LEFT button.
  6. Press RIGHT button to accept and move to next digit.
  7. Use RIGHT button to advance selected digit.
Exiting "Set" mode:

Push the RIGHT button.

Notes:
Pressing BOTH buttons for 2 seconds in the SPD/ATM mode will reset all functions, except clock, odometer, and calibration number.

Miles/Kilometers may be changed at any time, and accumulated data will be converted automatically.

This unit features a "Freeze Frame Memory" function:

  • Press LEFT button for over 1 second to freeze the display. You may continue to ride, viewing the information on the display. The entire display will flash, indicating information is frozen.
  • Press RIGHT button to cycle through the modes. The computer will continue to record information and store it in memory.
  • Press LEFT button to update display and return to normal mode.

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Vetta C-20

Battery 186/LR43
 
Entering "Set" mode to revise wheel size without losing mileage:
  1. Press RIGHT button to get to "MXS/ODO" mode.
  2. Press and hold BOTH buttons for 2 seconds.
  3. Select Miles (M/hr) or Kilometers (Km/h) by pressing the RIGHT button.
  4. Press LEFT button to confirm choice, and move to calibration number setting
  5. Use LEFT button to select digit to change.
  6. Use RIGHT button to advance selected digit.
Exiting "Set" mode:

Push the LEFT button.

Note:
Pressing BOTH buttons for 5 seconds in any mode will reset all functions, except clock, odometer, and calibration number.

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Vetta C-100

Battery: 2 SR44 or MS76 silver batteries.

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

Entering "Set" mode:
  1. Use "Mode" button to select "ODO" mode.
  2. Press "Set" button for 2 seconds.
Changing setting: or
  1. Use "Mode" button to select digit to change.
  2. Use "Set" button to advance selected digit.
Exiting "Set" mode:

Push the "Set" button.

Press both buttons for 2 seconds to enter Mph/Km selection mode. Release buttons when desired units are shown. Stored data will be converted to appropriate units.
Note: if Odometer reading is over 6125 miles, converting to Km will reset distance to zero.

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Vetta Wireless C-200

Battery:
  1. 3 volt lithium for comupter
  2. 12 volt alkaline for transponder
Entering "Set" mode to revise wheel size without losing mileage:
  1. Use RED button to get to "ODO" mode.
  2. Press YELLOW button for two seconds
Changing setting:
  1. The RED button will select the digits to be altered.
  2. The YELLOW button will advance the selected digit.
Exiting "Set" mode:

Press the YELLOW button again.

Miles/kilometers:
  1. Use RED button to get to "ODO" mode.
  2. Press YELLOW and RED buttons together for over two seconds.
  3. "KM/H" will be flashing. Use RED button to select "KM/H" or "M/H."
  4. Press YELLOW button to select choice.

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Vetta Wireless C-500

Battery:
  1. 3 volt lithium for comupter
  2. 12 volt alkaline for transponder
Miles/kilometers and wheel size setting:
  1. Use UPPER button to get to "AVS/ODO" mode.
  2. Press the LOWER butto for over two seconds.
  3. Use UPPER button to select "Km/h" or "M/hr."
  4. Press LOWER button to accept choice.
    (Unit will enter wheel-size setting mode.)
  5. The LOWER button will select the digits to be altered.
  6. The UPPER button will advance the selected digit.

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*********************** VETTA RT33, RT55, RT77, RT88 **********************

Vetta RT33, RT55, RT77, RT88

These four models are very similar, differing only in features:
  • RT33 is the basic model, lacking Average speed, Maximum Speed, Speed Comparator and Ride Timer functions of higher models.
  • RT55 (and higher models) adds Average speed, Maximum Speed, Speed Comparator and Ride Timer functions.
  • RT77 is as the RT55, with cadence functions added.
  • RT88 is as the RT55, with wireless pickup.
Battery: Cr 2032 Lithium

(RT88 Wireless transmitter uses A23 12 volt battery)

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Vetta VHR25 Heart Rate Cycling Computer

Battery: Lithium
 
Miles/kilometers:
  1. Check to be sure the unit is in "cycling" mode: display should show "SPD" and "M/hr" or "KM/h." If it is in "wrist watch" mode, press and hold top button for over 2 seconds.
  2. Use bottom button to get to "SPD/DST" mode.
  3. Press bottom button for two seconds
  4. "M/hr" or "Km/h" will be flashing. Use top button to select "M/hr" or "Km/h"
  5. Press bottom button to fix choice and move to wheel size mode.
Entering "Set" mode to revise wheel size without losing mileage:
  1. Use bottom button to get to "SPD/DST" mode.
  2. Press bottom button for two seconds, "M/hr" or "Km/h" will flash.
  3. Press bottom button again to enter wheel size mode
Changing setting:
  1. Bottom button will select the digits to be altered.
  2. Top button will advance the selected digit.
Exiting "Set" mode:

Press bottom button again.

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Vetta VHR50 Heart Rate Cycling Computer & Wrist Watch

Battery: Lithium
 
Miles/kilometers:
  1. Check to be sure the unit is in "cycling" mode: display should show "SPD" and "M/hr" or "KM/h." If it is in "wrist watch" mode, press and hold button "B" (left side) for over 2 seconds.
  2. Use button "A" (lower left) to get to "SPD/DST" mode.
  3. Press button "A" (lower left) for two seconds
  4. "M/hr" or "Km/h" will be flashing. Use button "B" (left side) to select "M/hr" or "Km/h"
  5. Press button "A" (lower left) to fix choice and move to wheel size mode.
Entering "Set" mode to revise wheel size without losing mileage:
  1. Use button "A" (lower left) to get to "SPD/DST" mode.
  2. Press button "A" (lower left) for two seconds, "M/hr" or "Km/h" will flash.
  3. Press button "A" (lower left) again to enter wheel size mode
Changing setting:
  1. Button "A" (lower left) will select the digits to be altered.
  2. Button "B" (left side) will advance the selected digit.
Exiting "Set" mode:

Press button "A" (lower left) again.

Heart Rate Function, Training Zone Limit Setting
  1. Use GRAY button to get to "SPD/R.T." mode.
  2. Press GRAY button for two seconds
  3. Press GRAY button again to bypass memory recall and enter Upper Limit setting mode
  4. Adjust Upper Limit by pressing WHITE button, hold for fast advance
  5. Press GRAY button to fix Upper Limit and enter Lower Limit setting mode
  6. Adjust Lower Limit by pressing WHITE button, hold for fast advance
Exiting "Set" mode:

Press the GRAY button again.

Heart Rate Function, Memory Recall
  1. Use GRAY button to get to "SPD/R.T." mode.
  2. Press GRAY button for two seconds
  3. "Hi" will appear, "Hi" limit in bottom window, and actual time spent above Upper Limit in middle window.
  4. Computer will cycle through "Lo", then "In"
  5. Press GRAY button three times to return to normal operating mode

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Vetta HR1000 Heart Rate Cycling Computer

Battery:
  1. 3 volt CR 2032 lithium for computer
  2. 3 volt CR 2032 lithium for chest strap transmitter
Miles/kilometers:
  1. Use GRAY button to get to "AVG/ODO" mode.
  2. Press GRAY button for two seconds
  3. "MPH" or "Km/h" will be flashing. Use WHITE button to select "MPH" or "Km/h"
  4. Press GRAY button to fix choice and move to wheel size mode.
Entering "Set" mode to revise wheel size without losing mileage:
  1. Use GRAY button to get to "AVG/ODO" mode.
  2. Press GRAY button for two seconds, "MPH" will flash
  3. Press GRAY button again to enter wheel size mode
Changing setting:
  1. The GRAY button will select the digits to be altered.
  2. The WHITE button will advance the selected digit.
Exiting "Set" mode:

Press the GRAY button again.

Heart Rate Function, Training Zone Limit Setting
  1. Use GRAY button to get to "SPD/R.T." mode.
  2. Press GRAY button for two seconds
  3. Press GRAY button again to bypass memory recall and enter Upper Limit setting mode
  4. Adjust Upper Limit by pressing WHITE button, hold for fast advance
  5. Press GRAY button to fix Upper Limit and enter Lower Limit setting mode
  6. Adjust Lower Limit by pressing WHITE button, hold for fast advance
Exiting "Set" mode:

Press the GRAY button again.

Heart Rate Function, Memory Recall
  1. Use GRAY button to get to "SPD/R.T." mode.
  2. Press GRAY button for two seconds
  3. "Hi" will appear, "Hi" limit in bottom window, and actual time spent above Upper Limit in middle window.
  4. Computer will cycle through "Lo", then "In"
  5. Press GRAY button three times to return to normal operating mode

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Vetta V100, V100A, V100HR

These three models are very similar, differing only in features:
  • V100 is the basic model.
  • V100A is the same, only with an altimeter.
  • V100HR is as the V100 with heart rate monitor added, and with the thermometer functions omitted.
Battery: Cr 2032 Lithium
 
Entering "Set" mode:
  1. Press Buttton 3 until you are in SPD/DST mode.
  2. Press and hold buttons 1 and 2 for 2 seconds
  3. Screen will say "bic no 1" (Bicycle #1)
Changing setting:
  1. Button 2 increments desired value
  2. Button 1 chooses next item to be revised:
    • Bicyle 1 or Bicycle 2
    • Altitude units feet/meters (100A only)
    • Altimeter on/off (100A only)
    • Altitude value 1 (100A only)
    • Altitude value 2 (100A only)
    • Circ (wheel calibration, group F)
    • Service timer 1 (total ride time, bike 1)
    • Service timer 2 (total ride time, bike 2)
    • Speed units miles/km
    • Temperature units fahrenheit/celsius
    • 12 hour/24 hour clock
    • Time
    • Odometer total
Exiting "Set" mode:

push button 3.

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Batteries

There are 4 types of batteries commonly used for cycle computers

Alkaline

Some older units, such as the Cateye Mate use penlight-type cells. These are adequate, but bulky.

Newer units that use "button cells" can run on alkaline "buttons", but the life span is much shorter than is the case with silver cells.

Lithium

Most modern units use lithium cells. Lithium cells have a very long shelf life, which makes them particularly suited for a low-drain application such as a cyclecomputer. They are cheap, and have a consistent voltage output throughout their useful life.

Lithium cells are also used in watches, cameras, calculators, games, etc. You can buy replacements at most camera or electronics dealers, and even jewelers.

Mercury

Mercury cells held more electricity for their size than others, and their voltage was very constant over their useful life.

Unfortunately, disposal of mercury cells is a serious environmental hazard, and their production is no longer legal. Many owners of older cameras are unable to find suitable batteries for this reason.

Avocet was the primary user of mercury batteries. Here's what they recommend:

"Models 20 & 30: 386 silver oxide, 1.5 volt. These were originally spec'd for 1.35 mercury which is no longer made. The 1.5 silver oxide is the closest equivalent and works OK with possible shorter life than the original mercury.

"Models 15, 25, 31, 35, 40, 45, 45tt: 675 zinc/air 1.4 volt. Originally spec'd 1.35 volt mercury no longer available. 1.4 volt works fine.

"For models 35 and 45 total reset is recommended before battery installation.

"For total reset, hold both buttons down for 35 seconds with battery out."

See also the Avocet Web Site.

Silver

Silver batteries provide a good supply of power, but are fairly expensive. The silver batteries used in cycle computers are similar to those used in some cameras and calculators. If you go to a camera shop for them, don't let them talk you into using alkaline replacements. The alkaline button cells that replace silver cells are very cheap wholesale, and represent a very high margin for a photo dealer. Unfortunately, their dramatically shorter lifespan makes them a bad choice for cycle computers.

The Cateye Solar and Solar II used to use a special rechargeable silver battery, which was only available from bicycle shops. They were quite expensive, but they lasted longer than regular cells if the unit was stored in bright light. These SR44R batteries are no longer available, but the camera version, SR44/MS76 is satisfactory.

There is also a lithium variant, which is the size of a pair of these cells that seems to work pretty well too. It is commonly numbered as "DL 1/3 N

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