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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

Summary of Contents for RT33

Page 1: ...ur 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 WA...

Page 2: ...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 CR2032 3 V O L T LITHIUM C E L L 1 3 4 8 1 5 7 1 1 5 2 1 2 9 1 0 6 ...

Page 3: ...ress 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 ...

Page 4: ...9999 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 calcul...

Page 5: ...o 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 Servic...

Page 6: ...ons 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 S...

Page 7: ...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...

Page 8: ...eded 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...

Page 9: ...re 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...

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