Vetta RT55 User manual

A
B
C
Contact Points
Battery Compartment
Battery Cover
A
C
B
HEAD UNIT: REAR
C
R
2
0
3
2
C
L
O
S
E
O
P
E
N
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/or improper
installation of this device may void the warranty. If in doubt about any aspect of the installation
or operation of this product, consult your local bicycle retailer for clarification.
The head unit is water resistant and sealed to withstand wet weather conditions. However, do not
deliberately place it in water.
Avoid leaving the head unit exposed to extremely hot weather conditions.
Vetta encourages you to ride safely. Wear a helmet every time you ride, use front and rear lights at
night, and always keep your eyes on the road ahead of you.
•
•
•
•
WARNINGS & CAUTIONS
HEAD UNIT: FRONT
A
B
C
D
E
F
G
Upper Display (Speed)
Speed Comparator Icon
Service Timer Icon
Speed/Distance Units
RPM Indicator
Lower Display
Function Icons
Set/Select Button (Left)
Mode/Advance Button (Right)
1
2
C
F
B
A
12
D
E
G

BATTERY INSTALLATION
C
R
2
0
3
2
C
L
O
S
E
O
P
E
N
C
R
2
0
3
2
3
V
O
L
T
L
I
T
H
I
U
M
C
E
L
L
COMPONENT ILLUSTRATIONS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Head Unit Battery (CR2032 - 3V)
WL Wireless Speed Transmitter Battery (A23 - 12V)
Wired Cadence Sensor (RT77)
Cadence Magnet (RT77)
WL Wireless Speed Transmitter (RT88)
Spoke Magnet
Wire Securing Tape
Wired Speed Sensor
Mounting Bracket Pad
Riser Handle Bar Bracket (You may choose 9 or 10 according
to the style of your bicycle handlebar.)
Zip Ties
Wireless Mount (RT88)
Wired Mount
Spacer
Transmitter Mounting Pad
3
C
R
2
0
3
2
3
V
O
L
T
L
I
T
H
I
U
M
C
E
L
L
1
3
4
8
15
711
5
2
12
9
10
6
14

MAIN UNIT SETUP
All RT series computers are programmed to enter the Setup mode after battery installation. In Set-Up,
Button #1 is used to select or set a value and to advance to the next digit or screen mode. Button #2 is
used to switch between settings and to increase values.
Press Button #2 to switch between flashing "12" and "24" hour formats. Press Button #1 to select desired
format and advance to time setting.
SET 12/24 CLOCK
To set the time in CLK mode: Press button #2 to advance hour digits to correct hour (hold button for rapid
advance). Press Button #1 to select and advance to minutes setting. Press Button #2 to advance minute
digits and press Button #1 to select. (To change the CLK format, time or service time interval, press
and hold Buttons #1 and #2 simultaneously for 2 seconds in the SPD/CLK screen mode until "12/24"
hour format digits flash).
SET TIME
Press Button #2 to switch between "M/hr" and "KM/hr" and Button #1 to select desired units and
advance. (To change units in SPD/ODO screen mode, press and hold Buttons #1 and #2
simultaneously for 2 seconds until "M/hr" begins to flash).
SET SPEED/DISTANCE SCALE
Press Button #2 to advance hour digits to desired total hours and press Button #1 to select and advance
(Maximum hour setting = 1999 hours).
SET SERVICE TIMER
Default wheel circumference setting is 2074mm. Choose correct wheel circumference figure from Wheel
Reference Chart. Press Button #2 to advance digits as needed and Button #1 to select and advance.
(Range: 0050-2999mm).
SET WHEEL SIZE

CLK RT 33|55|77|88
Time is displayed in user-selected 12 or 24 hour formats. (To change the CLK
format, time or service time interval, press and hold Buttons #1 and #2
simultaneously for 2 seconds in the SPD/CLK screen mode until "12/24" hour
format digits flash).
PRIMARY FUNCTIONS
Speed is shown at all times on upper display. It is accurate to 0.1 M/hr or KM/hr and
the maximum reading is 139.9 M/hr or 199.9 KM/hr.
SPD RT 33|55|77|88
The odometer displays distance to 99999 Miles or Kilometers (1.0 mile/km). User
selectable ODO setting in Setup mode. Note: Odometer units (initialized during
Setup). (To change units in SPD/ODO screen mode, press and hold Buttons #1
and #2 simultaneously for 2 seconds until "M/hr" begins to flash).
ODO RT 33|55|77|88
Press Button #2 to advance digits to previous mileage reading (after battery change). Press Button #1 to
select and advance to next digit. After final selection, computer will exit Setup and enter SPD/CLK screen
mode (Maximum setting: 99999).
SET ODOMETER
Mark the tire and a spot on the floor. Roll the wheel forward one complete revolution until the tire mark
touches the floor again and mark that spot. Measure the distance between the marks on the floor in
millimeters and enter the result into the computer. (1 inch = 25.4mm)
If your wheel size is not on the chart, or if you want a more precise calibration, wheel circumference
may be calculated as follows:
2168700c x 35mm
2155700c x 32mm
2145700c x 30mm
2136700c x 28mm
2124700c x 25mm
2105700c x 23mm
2074700c x 20mm
2180700c x 38mm
TIRE SIZE CIRC TIRE SIZE CIRC
207426" x 2.0"
205526" x 1.9"/ 1.95"
203526" x 1.75"
198526" x 1.5"
195326" x 1.25"
191326" x 1.0"
1618
1253
1257
1206
20" x 1-1/4"
191624" x 1.9"/ 1.95"
2130700c Tubular
1990650c x 23mm
1945650c x 20mm
215527" x 1-1/8"
213526" x 2.3"
209526" x 2.1"
216127" x 1-1/4"
211526" x 2.25"
TIRE SIZE CIRC
16" x 1.5"
16" x 1.95"
16" x 2.0"
DST RT 33|55|77|88
Displays trip distance of current ride to a maximum of 999.9 miles or kilometers (0.1
mile/km). To reset trip distance DST (+ MAX, AVG, RT, AVG/CAD, MAX/CAD) to
zero in normal operation, hold both buttons simultaneously for two seconds in
SPD/DST screen mode.

AVG RT 55|77|88
Average Speed is displayed in the SPD/AVG screen mode and reads to within 0.1
miles or kilometers per hour. Reset to zero manually by pressing and holding
Buttons #1 and #2 simultaneously for two seconds in the SPD/DST screen
mode.
CAD RT 77
Cadence is displayed in the SPD/CAD screen mode and measures revolutions per
minute (RPM) of the crank. The RPM indicator lights when the CAD function is
displayed.
Speed Comparator: Arrow symbols indicate if current speed is slower or faster
than current average speed.
RT 55|77|88
RT RT 55|77|88
Displays actual, cumulative ride time to 9:59:59. Reset to zero manually by
pressing and holding Buttons #1 and #2 simultaneously for two seconds in the
SPD/DST screen mode.
Maximum Speed is displayed in the SPD/MAX screen mode and reads to within 0.1
miles or kilometers per hour. Reset to zero manually by pressing and holding
Buttons #1 and #2 simultaneously for two seconds in the SPD/DST screen
mode.
MAX RT 55|77|88
Service Timer: Blinking wrench icon alerts rider when scheduled maintenance is
required for suspension shocks, chains or other components. Elapsed riding time
and current Service Timer setting can be viewed on upper and lower displays in
Setup mode. To view or change Service Timer interval, CLK format and time
setting, press and hold Buttons #1 and #2 for 2 seconds in the SPD/CLK screen
mode until "12/24" hour format digits flash. To reset ride time to "0", press
Button #2 when elapsed time digits are flashing during Setup. To disable
Service Timer, enter "0" hours as Service Time Interval in Setup.
RT 33|55|77|88
SPECIAL FEATURES
To conserve battery life, computer enters Sleep Mode after 5 minutes without
input from buttons or speed sensor and displays the time. Computer exits Sleep
Mode and returns to screen last displayed with input from buttons (RT
33/55/77/88) or wheel (RT 33/55/77).
SLEEP MODE RT 33|55|77|88

RT 77 SECONDARY FUNCTIONS
Secondary screen functions include Average Cadence and Maximum Cadence. To access, press and hold
Button #1 while in the SPD/CAD screen mode. Press Button #2 to switch between AVG/CAD and
MAX/CAD readings. Press Button #1 to return the primary SPD/CAD screen mode.
AVG/CAD RT 77
Average Cadence is displayed in the AVG/CAD screen mode. It is calculated by
dividing total revolutions by total ride time. Reset to zero manually by pressing
and holding Buttons #1 and #2 simultaneously for two seconds in the SPD/DST
screen mode.
Maximum Cadence is displayed in the MAX/CAD screen mode. It is updated once per
second based on current RT and Cadence readings. Reset to zero manually by
pressing and holding Buttons #1 and #2 simultaneously for two seconds in the
SPD/DST screen mode.
MAX/CAD RT 77
ALL CLEAR RESET RT 33|55|77|88
All Clear Reset: Remove battery and reinstall. When you remove the battery all data and all time and
odometer settings will be cleared. When battery is reinstalled, computer will automatically enter the
Setup program.
INSTALLATION PROCEDURES
Wired
Speed Sensor
Wired
Speed Sensor
Fork Leg
Spoke Magnet
Spoke
Magnet
Spoke Magnet
Spoke
Magnet
Sweep Path
Zip Tie
Spacer
Spoke
Magnet
Spoke
Spacer
Tip Alignment
Mark
Fig. A
WIRED SPEED SENSOR & MAGNET RT 33|55|77
Rider can freeze Distance, Ride Time, Average Speed and Maximum Speed readings at any time by
pressing Button #1 for two seconds while in the SPD/DST or SPD/RT screen modes. Display flashes to
indicate it has been frozen. Saved data can be scrolled and reviewed by pressing Button #2. Press Button
#1 to return to DST or RT screens.
FREEZE FRAME MEMORY RT 55|77|88

WL WIRELESS SPEED TRANSMITTER & MAGNET RT 88
A
2
3
1
2
v
C
L
O
S
E
O
P
E
N
C
L
O
S
E
O
P
E
N
A
2
3
1
2
v
C
L
O
S
E
O
P
E
N
C
L
O
S
E
O
P
E
N
A23
12V
WL Wireless speed transmitter uses an A23 12V battery. Install the battery as shown: remove cap,
install battery with positive (+) side up, replace battery cap.
A
2
3
C
L
O
S
E
O
P
E
N
C
L
O
S
E
O
P
E
N
A
2
3
C
L
O
S
E
O
P
E
N
C
L
O
S
E
O
P
E
N
UP
A
2
3
C
L
O
S
E
O
P
E
N
C
L
O
S
E
O
P
E
N
Spoke
Magnet
Fork Leg
Zip Ties
Magnet
Sweep Path
Spoke
Magnet
Spoke
Alignment
Mark
Spacer
Tip
Spoke
Magnet
WL Wireless
Speed Transmitter
5RCEGT
Spoke Spoke
Magnet
WIRED CADENCE SENSOR & MAGNET RT 77
RT77 only - Attach the wired cadence sensor and cadence magnet with the zip-ties supplied to the
bicycle. Adjust the sensor and magnet spacing with the spacer. Remove the spacer after snugging the
zip-tie down to hold the sensor in its final position. (See Figures above)
Cadence
Magnet
Wired Cadence
Sensor
Cadence
Magnet
Cadence
Magnet
Crank
Arm
Magnet
Sweep
Path
Chain Stay
Zip Tie
Spacer
Spacer
Tip Alignment
Mark
Crank Arm
Cadence
Magnet
Wired
Cadence Sensor
Attach the wired speed sensor with the zip-tie supplied and tighten the spoke magnet to the bicycle.
Adjust the sensor and magnet spacing with the spacer. Remove the spacer after snugging the zip-tie
down to hold the sensor in its final position. (See Figures above)

RT88 only - Attach the WL wireless speed transmitter with the zip-ties supplied and tighten the spoke
magnet to the bicycle. Adjust the transmitter and magnet spacing with the spacer. Remove the spacer
after snugging the zip-ties down to hold the transmitter in its final position. (See Figures above)
INSTALLATION TESTS
PROBLEM/ITEMS TO CHECK/SOLUTION
Current speed reading is erratic or does not appear.
Inspect the wiring for any breaks or kinks. Replace mounting bracket and sensor as needed.
•
Incorrect data appears on screen during operation.
Accuracy of the Setup data may be a problem (wheel size setting, etc.).
•
Data display is extremely slow.
Computer LCD does not like extremely low temperatures. Operating range is: 0ºC to 50ºC or 32ºF to
122ºF. Return the computer to a warmer climate.
•
Current speed reading is erratic or does not appear.
Check the alignment of the wheel magnet and sensor, and the distance between the two
components. Realign the magnet and sensor with the spacer.
•
MOUNTING BRACKET & HEAD UNIT
Attach mounting bracket.
Note: Be sure to leave
enough slack in the wire to
accommodate the movement
of fork and handlebars.
Tighten mounting bracket as
needed. (See fig. "A") Slide
main unit into bracket as
shown (left) until it clicks into
position. Remove by pressing
in the two locking tabs as
shown. Secure wire with tape
supplied and by winding it
around cables.
Wired
Mount
Cadence RT 77
Locking
Tab
Locking
Tab
UNLOCK UNLOCK
OUT
IN
Head Unit
Once installation is complete, the computer should be tested to make sure it is working properly.
If there is no speed reading, check the alignment and spacing between the magnet and
sensor/transmitter. Make sure that the head unit is completely locked into position and the
handlebar mount is not over tightened. If this check does not solve the problem, talk to your Vetta
Retailer or connect to www.vetta.com.
To test cadence installation:
Turn the crank backwards or ride the bike a short distance. After a few revolutions, a cadence reading
should appear on the lower line of the SPD/CAD display. If there is no cadence reading, check the
alignment and spacing between the magnet and sensor.
IMPORTANT: Following the installation tests above, make sure that the spoke magnet
locking screw and all zip ties are properly tightened. CAUTION: Do not over tighten!
Step 1:
Step 2:
Advance the computer to the SPD screen mode using Button #2.
Pick up the front of the bicycle and spin the front wheel. The computer should display a
speed reading within 2-3 seconds.
To test speed installation:

Screen is dark and display characters look "strange".
Computer screens do not like to be left in direct sunlight for extended periods of time. Move the
computer into the shade until the screen recovers. No effect on data.
•
Screen reading is weak or fading.
Symptom of a weak battery. Replace the battery.
•
Screen readings are erratic and read too high or too low.
Symptom of a weak battery. Replace the battery.
•
Screen "frozen", no response to buttons.
Symptom of a weak battery. Replace the battery.
•
No display whatsoever.
Battery is completely dead, or not installed. Replace or install the battery.
•
Acumen Inc, warrants all Vetta products, to the original purchaser, to be free of defects in materials or
workmanship for a period of three years from the original date of purchase. Acumen Inc 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 or fitness for a particular
purpose are limited to the three years duration of the above express warranty. Acumen Inc will not be
held liable for any incidental or consequential damages.
If you ever experience a problem with the function of your Vetta RT cycle computer, please contact or
visit your local Authorized Acumen Inc Dealer for assistance.
Should you experience a problem with your Vetta RT cycle computer that cannot be solved by your
local Acumen Inc Dealer, please follow these simple steps to assure quick and efficient processing of
your claim.
WARRANTY RETURN & REPAIR POLICY
Step 1:
Step 2:
Contact the appropriate Acumen Inc Customer Service Center listed below for help and to
obtain a Return Authorization Number (RA Number).
Send the unit back to the appropriate Acumen Inc Customer Service Center, together with
the original copy of your purchase receipt and a detailed explanation of the problem that
you are experiencing. Please be sure to write the Return Authorization Number (RA
Number) on your return package.
ACUMEN INC CUSTOMER SERVICE CENTERS
Acumen Inc.
101A Executive Dr., Suite 100,
Sterling, VA 20166, USA.
Acumen Europe BV
Splijtbakweg 117, 1333 HJ, Almere,
The Netherlands.
Email: [email protected]
Website: www.vetta.com