Vetta RT255, RT255L, RT277, RT288, RT288L User Manual

Vetta’s RT200 series are the upgraded version of all RT series cycle computers. It is recommended that these
products are to be installed by a qualified bicycle retailer. Failure to read the instructions and/ or improper installation
of the device may void the warranty. If you have any doubts about the installation or the operations, contact your local
bicycle retailer for clarification.

WARNINGS & CAUTIONS

HEAD UNIT

COMPONENTS

RT255 RT255L
RT277 RT288 RT288L

1. Button

2. Button

3. Button

4. Button (RT255L/288L)

5. Main Display

6. Contact Pins (RT255/255L/277)

7. Battery Compartment

8. Battery Cap

Heavy Duty Metal Braided Cable

Wireless Transmission

Replaceable Front Cover

Screen Display Window

NiteLite w/ SmartLite

EZ Tire Set

Service Timer

Speed Comparator

Auto Awake & Start-up

Energy Efficient programmable Auto Start

Current Speed

Average/Maximum Speed

Ride Time

Cumulative Odometer

Trip Distance

Multi Freeze Frame Memory

Lap

Current/Average/Maximum Cadence

12/24 Hour Clock

FUNCTIONS / FEATURES

RT255/255L includes:

1 3 4 5 9 11 12 14 15

RT277 includes:

2 3 4 5 9 10 11 12 14 15

RT288/288L includes:

3 4 5 6 7 8 9 11 12 13

1. Wired Spd Sensor with Mounting Bracket
(with Heavy Duty Harness)

2. Wired Spd & Cad Sensor with Mounting Bracket
(with Heavy Duty Harness, for Rear Wheel Pick-up)

3. Extra Clear Front Cover

4. Bracket Rubber Pad

5. Bracket Rubber Pad (Riser Handlebar)

6. WL Wireless Speed Transmitter

7. Wireless Mounting Bracket

8. Wireless Transmitter Shim

9. Bladed Spoke Magnet

10. Composite Cadence Magnet

11. Spacer

12. Head Unit Battery (CR2032, 3-Volt)

13. Wireless Transmitter Battery (A23, 12-Volt)

14. Wire Securing Tape

15. Zip-Ties

1
2

3
4

RT255 RT255L RT277 RT288 RT288L

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11 16 11 11 16

10 15 10 10 15

3 3 3 3 3

1.0

4

5

1

3

2

6

7

8

1

7 8 9

10

11 12 13 1514

2

4

3

5 6

LCD DISPLAY

1. Upper Display

2. Middle Display (Speed)

3. Lower Display

4. Service Timer/ Low Battery Icon

5. Speed Comparator Icon

6. Speed / Distance Units

7. Setup Mode Icon

8. Function Icons

9. RPM / RT/ PM/ TM Icon

10. Speed & Split Time Icon

11. Freeze Frame Memory Icon

12. Lap Icon

13. Auto Start Icon

1

2

5

6

7

8

9

10

11

13

12

4

3

Important:

Do not use Zip-Ties, use the tapes provided with the package to hold wires to the frame, fork, bars or stem
to avoid damaging or cutting the wires accidentally. Make sure excess wire is taped down or wrapped around brake cable
housing to secure it.

BATTERY INSTALLATION

INSTALLATION

WIRED CADENCE SENSOR & MAGNET (

RT277)

Attach the Wired Cadence Sensor & Composite Cadence Magnet with the Zip-Ties supplied to the bicycle. Adjust the
sensor & magnet spacing with the spacer. Remove the Spacer after snugging the Zip-Ties down to hold the sensor in its
final position.

4

1

3

2

BUTTON FUNCTIONS

WIRED SPEED SENSOR & MAGNET (

RT255/255L)

Press momentarily

Button : Upper Screen Modes
Button : Lower Screen Modes
Button : F-Button or Lap Button
Button : NiteLite (RT255L/288L)

Press & hold for 2 seconds

Button : Recall Freeze Frame Memories or Lap Data
Button & when the lowest screen is in the CLK Mode: NOM Setup
Button & when the lowest screen is in the DST Mode: Reset ride data
to zero including the Frozen screens or Lap data
Button , & : All Clear Total Reset

Wired Cadence Sensor

Crank

Arm

Chain Stay

Spacer

Spacer

Tip

Alignment Mark

Crank Arm

Composite Cadence

Magnet

Wired Cadence Sensor

Zip-Tie

Composite

Cadence Magnet

Composite

Cadence Magnet

Composite

Cadence Magnet

Wired Speed Sensor

Wired Speed Sensor

Fork Leg

Bladed

Spoke Magnet

Bladed

Spoke Magnet

Bladed

Spoke Magnet

Bladed Spoke Magnet

Spoke

Magnet

Sweep Path

Zip-Tie

Spacer

Spoke

Spacer

Tip

Alignment Mark

Fig. A

1
2
3
4

3
1
1

1 223

2

Magnet Sweep Path

The RT200 series Head Unit use CR2032, 3-Volt Lithium button Cell batteries.
Battery Run Time (1 hour training / day): Approx.12 months (RT255/255L/277); Approx. 8 months (RT288/288L)

Important:

Most cycle computer problems are caused by weak or
dead batteries. See the Trouble Shooting section near the end of
the manual for details.

1. Remove the battery cap from the bottom of the Head Unit using

a coin.

2. Install a new battery as shown with the positive (+) side facing out. Do not touch or bend
any of the battery contacts during installation.

3. Screw the battery cap firmly into place and make sure that the O-ring seal does not get pinched or distorted.

Caution:

To avoid damage to the battery cap, do not over tighten.

HEAD UNIT

The WL Wireless Speed Transmitter uses an A23, 12-Volt battery. Remove the battery compartment using a coin and
install the battery in it with positive (+) side in, then replace the battery compartment.
Battery Run Time (1 hour training / day): Approx.10 months

WL WIRELESS SPEED TRANSMITTER (

RT288/288L)

A23, 12V

Attach the Wired Speed Sensor with the Zip-Tie supplied and tighten the Bladed Spoke Magnet to the bicycle. Mounting
the sensor as high up as on the fork leg. (Fig. A) 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.

WL WIRELESS SPEED TRANSMITTER & MAGNET (

RT288/288L)

Tie the WL Wireless Speed Transmitter with Bracket Rubber Pad loosely by the Zip-Ties supplied to either in the front of
the left fork leg (see Fig.1 A) or at the back of the right fork leg (see Fig.1 B). For best signal reception, make sure the

distance between the Transmitter and the Head Unit is within 70 cm. At the same time, the Transmitter should be
2 ~ 4 cm (or more) away from the brake, to avoid blocking transmission signals by the brake. Adjust the transmitter

and magnet spacing with the Spacer. Slide and rotate the transmitter until the alignment mark just touches the spacer tip
on the magnet. Remove the Spacer after snugging the Zip-Tie down to hold the transmitter in its final position.

Within 70 cmWithin 70 cmWithin 70 cm

2~4 cm2~4 cm

2~4 cm

Fig.1 B

Fig.1 A

1

WW

Fork Leg

Zip-Ties

A

2

3

C

L

O

S

E

O

P

E

N

Magnet

Sweep Path

Spoke

Bladed
Spoke
Magnet

Bladed Spoke

Magnet

A

2

3

C

L

O

S

E

O

P

E

N

Wireless Speed

Transmitter

A

2

3

C

L

O

S

E

O

P

E

N

Spacer Tip

Alignment

Mark

MOUNTING BRACKET & HEAD UNIT (

RT255/255L/277/288/288L)

Attach Mounting Bracket & Bracket Rubber Pad to the handlebar on the
“Sensor/Transmitter side” using the Zip-Ties provide. Adjust its position
to your liking and tighten the Zip-Ties.

Note: Be sure to leave enough

slack in the wire t o accommodate the movemen t of fork and
handlebars. (See Fig. A)

Slide the Head Unit into the Mounting Bracket as shown 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.

Locking Tab Locking Tab

UNLOCK UNLOCK

Wired Mounting Bracket

Head Unit

SETUP & PROGRAMMING

SERVICE TIMER RT 255|255L|277|288|288L

SPEED/ DISTANCE UNIT RT 255|255L|277|288|288L

INSTALLATION TESTS

Once installation is complete, the computer should be tested to make sure it is working properly.

To test the Speed Sensor/Transmitter installation:

Pick up the front of the bicycle and spin the front wheel. The LCD should display a speed- reading within 2-3 seconds.

To test the Cadence Sensor installation (RT277):

Advance the LCD to the CAD Mode using or . Turn the crank backwards or ride the bicycle a short distance. After a
few revolutions, a cadence reading should display on the LCD.

If there is no spe ed-reading or cadence read ing, check the alignment and spacing between the magnet an d
sensor/transmitter. Make sure that the Head Unit is completely locked into position. If these checks do not solve the
problem, talk to an Authorized Vetta’s Retailer or connect to www.vetta.com

.

Important:

Make sure the magnets locking screw and all Zip-Ties are properly tightened.

Service Timer could be programmed with a selected number of ride time (hours or days) or distance as the interval for
servicing the bicycle or any component on it, such as a front or rear shock.
The default settings “0000” means the Service Timer is turned off.
Press to scroll flashing hr (hour), day or dst (distance) as the Service Timer unit. Press to select the desired Service
Timer unit.
When the desired Service Timer unit has been chosen, press to scroll the flashing digit to the desired number. Press

1

to select this number and advance to next digit. Repeat this procedure until all digits are selected. Press to advance

the next Setup Mode. ( Maximum settings: hour / day / distance = 1999 / 999 / 9999 )

2

1 2

2

1

2

1

In Setup, Button is used to select or set a value and to advance to the next digit or Mode. Button is used to switch
between settings and to increase values.

Initial Setup

All RT200 series computers are programmed to enter the Initial Setup Mode after new battery replacement or all clear
total reset (press , & simultaneously for 3 seconds in any Mode).
In the Initial Setup, riders can program the Basic Settings for the computer, the content of settings are same as NOM
Setup for Basic Setting.

Important:

The computer CANNOT exit the Initial Setup Mode until all the Basic Settings are finished.

NOM Setup

After completed the Initial Setup, riders can change any values or correct any errors by re-entering the NOM Setup.
To enter the NOM Setup Mode press & hold & simultaneously when the lowest screen is in the CLK Mode. Press

3

any time to exit and advance to the previous Mode.

1

1 223

1 2

2 2 2

1

When the Ride Tim e (the elapsed time for Serv ice
Timer) or the elapsed distance begins to flash, press

2

to reset to zero;
OR press to reserve the digits, and advance to the
next Setup Mode.

Important:

In the Initi al Setup, the elapsed time [distance ] for
Service Timer doesn’t exist.

OR OR

1

1 2

1

2 1

2

1 2 1

2

2

1

Press to toggle between flashing M/hr and KM/hr. Press to select
and advance to the next Setup Mode.
Note: Speed/Distance Unit cannot be changed if there have been ride
data on screens. If you want to change the Unit, please make sure you
had cleared all ride data before entering the NOM Setup Mode. This
restriction does not apply to the Initial Setup after the 1

st

time battery

installation, new battery replacement or All Clear Total Reset.

12/24 CLOCK RT 255|255L|277|288|288L

TIME RT 255|255L|277|288|288L

2

Press to toggle between flashing 12 and 24 hour formats. Press

1

to select your desired format (without PM icon implies AM in 12

hour format) and advance to Time setting.

Press to advance hour digits to correct hour (hold button for rapid advance). Press to select and advance to minute
setting. Press to advance minute digits to correct minute. Press to select and advance to the next Setup Mode.

2 1 2

2

2

1

2

1

WHEEL/ TIRE SIZE RT 255|255L|277|288|288L

Press to toggle between flashing circ (circumference) and tire (tire type). Press to select the desired and advance
the settings.
If pre-set to circ (see Table of Tire Size Vs Circ), press to scroll the flashing digit to the desired number. Press to
select this number and advance to next digit. Repeat this procedure until all four digits are selected.
If pre-set to tire, press to scroll the flashing 700c, 650c, 27in, 26in, 24in, 20in or 16in. Press to select and advance
to next setting to complete the Tire Size. Again, press to scroll and press to finalize the Tire Size and advance to
the next Setup Mode.

ODOMETER RT 255|255L|277|288|288L

Press to scroll the flashing digit to the desired number. Press to select this number and advance to next digit. Repeat
this procedure until all five digits are selected. Press to advance the next Setup Mode. (Maximum setting: 99999)

TIRE SIZE CIRC

700c x 20mm 2074
700c Tubular 2130
650c x 23mm 1990
650c x 20mm 1945
27” x 1.25” 2161
27” x 1.125” 2155
26” x 2.3” 2135

TIRE SIZE CIRC

700c x 38mm 2180
700c x 35mm 2168
700c x 32mm 2155
700c x 30mm 2145
700c x 28mm 2136
700c x 25mm 2124
700c x 23mm 2105

TIRE SIZE CIRC

26” x 1.0” 1913
24” x 1.9/1.95” 1916
20” x 1.25” 1618
16” x 2.0” 1253
16” x 1.95” 1257
16” x 1.5” 1206

TIRE SIZE CIRC

26” x 2.25” 2115
26” x 2.1” 2095
26” x 2.0” 2074
26” x 1.9/1.95” 2055
26” x 1.75” 2035
26” x 1.5” 1985
26” x 1.25” 1953

2 1 1

FUNCTIONS

AUTO START RT288|288L

When Auto Start is On: The computer exit the Sleep Mode as soon
as it receives the speed signal or any button is pressed.
When Auto Start is Off: To conserve battery run time, the computer
will only exit the Sleep Mode when any button is pressed.
Press to toggle between flashing OFF or ON. Press to select
and advance to next Setup Mode.

2

F or LAP

RT 255|255L|277|288|288L

SMARTLITE RT 255L|288L

SPD

RT 255|255L|277|288|288L

SmartLite will turn on the night light for 3 seconds between pre-set intervals when any button is pressed. Press to toggle
between OFF and ON. When SmartLite is set to OFF, press to exit the Setup Mode. When SmartLite is set to ON, press to
select and advance the hour setting. Press to advance the hour digits to desired hour [range of Fr (from): 1:00 PM to 11:00 PM;
range of To (to): 1:00 AM to 11:00 AM]. Press to select and exit the Setup mode.

Speed is shown at all times on middle 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.

2 2

2

2

2

1

1

1

1

2

2

1

1

2 1

Press to scroll the flashing F (Freeze Frame Memory), LAP (Lap Data) and OFF (both of Freeze Frame Memory and
Lap). Press to select and advance to next Setup Mode.

Note: The icon or in the Normal Display Modes indicates F or Lap has been chosen.

2

1

2

1

1

2

1

2 1 1

1

1 2 1

21

2

The types and number of Modes of the upper screen are same as the lower screen. Depending on users’ habits, they can
decide where to put the desired Modes either on the upper or lower screen.
Press to change the Upper Screen Modes.
Press to change the Lower Screen Modes.
To enter the NOM Setup Mode, press & hold & simultaneously for 2 seconds when the lowest screen is in the CLK Mode,
Press at anytime to exit.
To reset all ride data (DST, AVG SPD, MAX SPD, RT, AVG/CAD*, MAX/CAD*) to zero, press & hold and simultaneously for 2
seconds when the lowest screen is in the DST Mode. (* RT277 Only)

1 2

2

1

1

2

3

Note: The icon Auto in the Normal Display Modes indicates the programmable Auto Start has been chosen.

2