Vetta C-25 User manual

CYCLE COMPUTER OWNER'S MANUAL
ENGLISH FRANÇAIS ESPANOL DEUTSCH ITALIANO
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Congratulations on your purchase of the new Vetta C-25 mountain bike cycle computer. The C-25 is the first
cycle computer specifically designed to withstand the rigors of serious off-road cycling. The exclusive
oversized digits make viewing on rough trails easy and the large buttons work even with gloved hands. The
C-25 also features Vetta’s new ultra secure twist mount bracket which keeps the computer secure on the
roughest terrain. These features and many more make the C-25 the only computer of its type in the world.
INTRODUCTION
WARNINGS AND CAUTIONS
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CAUTION Vetta Sports encourages you to ride safely. Wear a helmet every time you ride, use a front
and rear light at night, and always keep your eyes on the road ahead of you.
CAUTION Vetta cycle computers are sophisticated electronic instruments. Vetta recommends that this
product be installed only by a qualified bicycle retailer. Failure to read these instructions and improper
installation of this device may void the warranty. If you are in doubt about any aspect of the installation or
operation of this product, consult your local bicycle retailer for clarification.

SPEEDOMETER ( ) ( or )
Tells you your instantaneous speed. Accurate to 0.1 mph or kmph below 10 mph
or 16 kmph; accurate to 0.5 mph or kmph above 10 mph or 16 kmph.
LISTING OF FUNCTIONS
DRAWINGS OF PARTS
Head Unit Battery Magnet Rubber ShimsBracket
Sensor
DUAL BIKE SETTINGS ( / )
The C-25 is equipped with the provision to allow it to be calibrated for two separate
bicycles. The unit has memory for wheel size settings and total odometers for
each bike. Change from the Bike 1 setting ( ) to the Bike 2 setting ( ) by
holding the “A” key for 2 seconds.
TRIP ODOMETER ( )
Tells you the distance for your current ride from 0 to 999.9 mi. or km.
AUTOMATIC RIDE TIME STOPWATCH ( )
Stopwatch that starts and stops when your wheel is turning. Records true ride
time, time actually spent riding, up to 19:59:59. Average speed is calculated
using this information to give you your true average riding speed.
TOTAL TIME STOPWATCH ( )
The Total Time Stopwatch will start with the Ride Time Stopwatch when the wheel
begins to turn, but keeps running when the wheel stops for the total time of the
ride, up to 99:59:59. Manually start and stop the Total Time Stopwatch by pressing
the “C” key. RESET BOTH STOPWATCHES BY HOLDING THE “C” KEY FOR 2
SECONDS WHILE IN THE / MODE.

NOTE: Resetting stopwatches also resets trip distance and average speeds.
COMPARATIVE STOPWATCHES
Both and stopwatches appear on the screen together. This allows you to
quickly compare time spent riding to the total time of your ride.
NOTE: The
icon on the screen will flash in all modes when the Total Time Stopwatch is in operation.
TEMPERATURE ( )
The C-25 is equipped with a temperature sensor that gives you instantaneous
temperature in either degrees Fahrenheit or Celsius from 2°to 140°F or -19°to 60°C.
The temperature display updates every 60 seconds. The temperature reading is
tied to the calibration of the unit. If the unit is set for miles, the temperature will
read in degrees Fahrenheit; if the unit is set for kilometers, the temperature will
read in degrees Celsius. This is preprogrammed and cannot be changed.
AVERAGE SPEED ( )
Your average speed calculated using your true ride time and trip distance.
MAXIMUM SPEED ( )
Displays the fastest speed that you have traveled.
DIGITAL 12/24 HOUR CLOCK ( )
Gives you the time of day in a 12 or 24 hour format.
CUMULATIVE ODOMETER ( )
Tells you your cumulative distance for the year from 0 to 99999 mi. or km.
RESETTABLE ODOMETER
The cumulative odometer on the C-25 can be preprogrammed to any desired
mileage. This feature allows you to retain your cumulative mileage when replacing
batteries or allows you to lie about your mileage to impress your friends.
AUTO SHUT DOWN
As a battery saving device, Vetta computers will automatically shut down after
5-10 minutes of non-use. Your C-25 will automatically restart itself as soon as
the unit receives input from the wheel. When in the Auto Shut Down mode the
C-25 will display the time of day.

BATTERY INSTALLATION
The C-25 uses a common 3032 3v lithium button cell battery. Replacement
batteries are available at most camera shops and from your Vetta retailer. Under
normal usage a battery should last approximately one year.
NOTE: Most
problems that occur with cycle computers are caused by dead or weak batteries.
If you are having problems with your computer's operation, check and replace the
battery first.
STEP 1
Remove the battery cover from the bottom of the computer using a coin.
STEP 2
Install the battery into the battery compartment with the positive (+) side of the
battery facing the compartment door. Be careful when you are installing the
battery not to bend any of the battery contacts.
STEP 3
Screw the battery cap firmly into place making sure that the rubber o-ring seal does
not get pinched or distorted as this will compromise the waterproofing of the unit.
3032 3v Lithium Battery
AUTO CLEAR BUTTON
Press for total reset of unit.
All stored data will be erased.
!CAUTION
“A” BUTTON (LEFT BOTTOM)
Advances through the primary functions (Speed, Trip Distance, Ride and Total
Time Stopwatches).
Changes from Bike 1 to Bike 2 (Hold for 2 seconds).
“B” BUTTON (LEFT TOP)
Advances through the secondary functions (Temperature, Average and Maximum
Speeds, Clock and Total Odometer).
Begins programming sequences (Hold for 2 seconds).
Sets and advances the screen while programming.
“C” BUTTON (RIGHT)
Starts and stops the manual stopwatch.
Resets the stopwatches and odometers (Hold for 2 seconds).
Adjusts the digits while programming.
BUTTON FUNCTIONS
“A”
“C”
“B”

Now that you are familiar with the features of your Vetta cycle computer, you are ready to begin programming
the unit specifically for your bike. Take a few minutes to familiarize yourself with the buttons and keystroke
sequences before you proceed to the programming of the unit.
PROGRAMMING THE HEAD OF THE COMPUTER
All Vetta cycle computers are capable of being programmed to read out in either miles or kilometers. It is also
possible to change back and forth between miles and kilometers by simply reentering the setting program and
changing your choice of measurements.
The C-25 has the ability to store wheel size and odometer information for 2 different bicycles. To change between
the settings for the two bikes, simply press the “A” key for 2 seconds in any mode. A small Bike 1 ( ) or
Bike 2 ( ) icon will appear in the upper left corner of the display to inform you which mode you are in.
NOTE: You will need to perform the following programming functions for each of the two bike memories.
SETTING MILES/HOUR OR KILOMETERS/HOUR
STEP 1
With the display in the Trip Distance ( ) mode press the “B” key for 2 seconds
to enter the programming mode. The screen will clear and the icon will
flash along with an indicating degrees Fahrenheit.
NOTE: The temperature settings are permanently tied to the distance settings of
the unit. If the unit is programmed in miles, the temperature will read in Fahrenheit;
if the unit is set in kilometers, the temperature will read in Celsius. There is no
way to change this.
STEP 2
Press the “C” key to change between the miles ( ) or kilometers ( ) settings.
STEP 3
Press the “B” key to set your choice and advance to the wheel size setting mode.
NOTE: The C-25 is programmed with a quick escape feature to the programming
function. Pressing the “A” key at any time will automatically set the information
on the screen and return you to the Trip Distance ( ) screen.

DETERMINING YOUR PROPER WHEEL SIZE
Vetta cycle computers are programmed using the circumference of the wheel measured in millimeters. Note
that while your computer can be programmed to +/- 1mm for total accuracy, discrepancies of as much as
50mm or more will not have a significant effect on the accuracy of the unit for most normal rides.
The following chart lists the programming sizes for some of the most popular wheel sizes currently in use.
These numbers are estimations and may vary slightly from the size of your actual wheel depending on the
manufacturer of the tire that you are using.
26 x 1.7
26 x 1.9
27 x 1.0 700c Tubular
26 x 2.1 700 x 38c
26 x 2.0
700 x 25c
700 x 28c
700 x 32c
27 x 1-1/4
650 x 20c
700 x 23c
700 x 20c
650 x 23c
2035
2055
2074
2095
2140
2180
1945
1990
2124
2140
2155
2074 2170
2114 2130
TIRE SIZE TIRE SIZE TIRE SIZE
CIRC. CIRC. CIRC.
WHEEL SIZE CALCULATION
If the wheel size of your bike is not listed in the chart, follow these simple steps to calculate the calibration
number for your bike.
STEP 1
Measure the distance from the center of the front axle to the ground in millimeters. If you are measuring in
inches, multiply the number of inches by 25.4 to get millimeters. If you want total accuracy make this
measurement while you are sitting on the bike.
STEP 2
Multiply the above number by 6.2832 (2π).
STEP 3
Enter the resulting number into the computer.
PRESET VALUE
The C-25 has a factory preset wheel size value of 2074 (26 x 2.0).

PROGRAMMING YOUR WHEEL SIZE
STEP 1
Once you select miles ( ) or kilometers ( ) and press the “B” key, the
C-25 will automatically advance into the wheel size setting mode.
STEP 2
The right hand digit (4) will begin flashing. Use the “C” key to advance to the
number that you want.
NOTE: Hold the “C” key to fast advance through the digits.
STEP 3
Press the “B” key to set the number and advance to the next flashing digit (7).
STEP 4
Repeat this sequence until all digits are at the appropriate settings.
STEP 5
Press the “B” key one final time to enter the wheel size setting into memory and
advance the unit to the resettable odometer mode.
This sequence needs to be performed for each of the two bike memories in the C-25.
Once you have completed the programming of the wheel size setting of the unit,
you will enter the programming sequence for the programmable odometer. On a
new computer this screen should read 00000. If you do not want to program the
odometer simply press the “A” key to exit the programming sequence and return
to the screen.
If you are replacing a battery and wish to retain your mileage in the computer,
follow these steps:
STEP 1
When the unit enters the programming sequence for the odometer, the right digit
(0) will begin flashing.
STEP 2
Advance the digit using the “C” key until you get to the desired number (Hold for
fast advance).
PROGRAMMING THE RESETTABLE ODOMETER

The Vetta C-25 cycle computer is equipped with a digital clock that displays time
in either 12 or 24 hour formats.
STEP 1
With the unit in the / mode press the “B” key for 2 seconds.
STEP 2
The screen will clear and a 12 will appear. Press the “C” key to change between
the 12 and 24 hour formats. Press the “B” key to set your choice. The hours
segment will appear and begin to flash.
SETTING THE CLOCK
STEP 3
Press the “B” key to set the digit and advance to the next number in the sequence.
STEP 4
Repeat this process until you have programmed in the number that you want. A final press of the “B” key
will complete the programming and return you to the Trip Distance ( ) screen.
STEP 3
Advance the hours digits using the “C” key (Hold for fast advance).
STEP 4
When you have selected the correct hour, press the “B” key to set the digit and
advance to the minutes setting screen.
STEP 5
Advance the minutes digits using the “C” key (Hold for fast advance).
STEP 6
Press the “B” key to set the minutes and return to the / screen.
NOTE: The above sequence needs to be performed for each of the two bike
memories.

MAGNET, SENSOR AND BRACKET INSTALLATION
We recommend that you install your C-25 in the following manner, starting
with the sensor unit and working up to the mounting bracket on the handlebar.
Unlike other computers, the C-25 is specifically designed to be mounted to the
left of the handlebar stem. This places the operating buttons to the left where
they can be easily operated with your left hand, keeping the right free for
shifting and braking.
STEP 1
Mount the Vetta universal S-2 sensor (pat. pend.) loosely (so that you can
slide it around) to the left hand fork blade using the zip-tie provided. The
sensor can be mounted at any point along the fork, however, we recommend
a position on the back side and near the top of the fork blade. This will protect
the sensor from being hit by rocks, trees and other objects.
STEP 2
Again, loosely install the sensor magnet to one of the spokes on the left side
of the front wheel. Adjust the magnet and sensor position by sliding both
Wiring Diagram
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pieces around until you get the sensor as high on the fork blade as possible
while still maintaining the necessary magnet to sensor spacing (1-2mm).
NOTE: The sensor magnet should pass within 1-2 mm of the sensor unit and
the top of the magnet should be no higher than the top of the small arrow
molded into the face of the sensor.
STEP 3
Route the sensor wire up the back of the fork securing with electrical tape.
CAUTION Do not use zip-ties to secure the sensor wire to the bike as this
may result in cut or broken wires.
CAUTION Be sure to leave enough slack in the wire to allow for the steering
motion of the bike and the action of the suspension fork, if you have one.
STEP 4
Carefully wrap the excess sensor wire around the front brake cable housing,
securing with electrical tape when necessary. When you are finished, you
should have just enough slack for the computer mounting shoe to reach the
handlebar.
Check to make sure that all of the excess sensor wire is either taped down or
Sensor
Zip-Tie
Alignment
Arrow
Fork Leg
Wheel
Magnet
1-2mm

Clamp the bracket around the handlebars and tighten in place. All Vetta cycle computer brackets are designed
to work with 26.0 - 26.4mm standard diameter road handlebars. Shims are provided to fit smaller 25.4mm
mountain and road bars.
NOTE: Make sure not to over tighten the bracket as this may result in breakage. The bracket only needs to be
tightened enough to keep it from spinning on the handlebar during normal riding.
NOTE: When installing the C-25 mounting bracket be sure to leave enough room between the bracket,
handlebar stem and other items attached to the handlebars to allow the head of the computer to be installed
without interference.
BRACKET INSTALLATION
The C-25 utilizes an exclusive twist mount style bracket designed to eliminate the
chance of the head unit coming out of the bracket during rough riding or in the
event of a crash. The bracket also utilizes isolated split contact pins to reduce the
possibility of the unit shorting out when it is used in a wet environment.
STEP 1
Place the head unit in the bracket with the “A” and “B” buttons toward the rear of
the bicycle.
STEP 2
Twist the head unit clockwise 1/4 turn until it is parallel with the handlebars and
locks into place in the bracket.
NOTE: The heads of all Vetta computers are designed to lock into their brackets.
When installing your computer head into the bracket you should hear an audible
“SNAP” indicating that the unit is locked firmly in place.
HEAD UNIT INSTALLATION

C-25 QUICK REFERENCE CHART
Switch from Bike 1 to Bike 2
Start/Stop Total Time Stopwatch
Enter Clock Programming Mode
Adjust Digits in any Programming Mode
Set Digits in any Programming Mode
Enter Wheel Size Programming Mode
Reset Stopwatches
A
C
B
C
B
B
C
Hold for 2 Seconds
Press
Hold for 2 Seconds in Clock Mode
Press, Hold for Fast Advance
Press
Hold for 2 Seconds in Trip Distance Mode ( )
Hold for 2 Seconds
FUNCTION KEY ACTION
Quick Programming Escape A Press at any Time when in Programming Sequence
Once you have finished with the installation procedure, you are ready to test the unit to make sure that it works.
STEP 1
Advance the computer to the speedometer mode.
STEP 2
Pick up the front of the bicycle and spin the front wheel. The computer should register speed within 1-2 seconds.
If you do not get a speed reading, check to be sure that the magnet and sensor alignment is correct and that
the space between the magnet and sensor is 1-2mm or less. If this does not solve the problem, call the Vetta
customer service hotline at 1.800.GO.VETTA.
TEST OF INSTALLATION

Vetta Sports warrants all Vetta products, to the original purchaser, to be free of defects in materials or
workmanship for a period of one year from the original date of purchase. Vetta Sports will, at its sole
discretion, repair or replace any product deemed defective. This express warranty is in lieu of all other
warranties, either expressed or implied. Any warranties of merchantability of fitness for a particular purpose
are limited to the one year duration of the above express warranty. Vetta Sports will not be held liable for any
incidental or consequential damages.
If you ever experience a problem with the function of your Vetta C-25 cycle computer, please visit your local
Authorized Vetta Dealer for assistance.
Should you experience a problem with your Vetta C-25 cycle computer that can not be solved by your local
Authorized Vetta Dealer, please ask them to comply with the following simple steps to assure quick and
efficient processing of your claim.
WARRANTY
WARRANTY RETURN AND REPAIR PROCEDURE
STEP 1
Fill out the warranty information card within this manual.
STEP 2
Call the appropriate Vetta Customer Service number listed below for help or to obtain a Return Authorization
Number (RA Number).
STEP 3
Send the unit back to the appropriate Vetta Customer Service Center along with the original copy of your
purchase receipt and a detailed explanation of the problem you are experiencing.
Vetta Customer Service USA Vetta Customer Service Europe
1500 Kearns Boulevard Suite A-200 Via E. Fermi 4
Park City, UT 84060 USA Casella d'Asolo (TV) 31010 Italy
Phone: 1.800.GO.VETTA or 1.801.647.2929 Phone: [phone]
Fax: [phone] Fax: [phone]
Email: [email protected] Email: [email protected]
Serving: US, Canada, South America, Australia, Serving: Europe and the Middle East
New Zealand, and Asia

WARRANTY INFORMATION CARD
Name
Address
Phone/Fax Number
Place of Purchase
RA Number Date of Purchase
Problem