PearTune Installation


Remove the pedal arm using a proper equipment and the plastic cover of the centerdrive (using  TORX  screws)  on  the  other  side  than  the sprocket  is  located.  All  the  needed  cables  and connectors are hidden under this cover.

Disconnect the 4-position connector in between the display unit and motor  unit  (marked  as  DISPLAY  on the  picture)  aswell  as  the  2-position connector in between the tacho sensor and motor unit (marked as SPEED SENSOR).

③ Connect  both  appropriate connectors  from  the  MSO  instead  of the  original  connectors  into  the  the motor unit and, the original, previously disconnected connectors into the MSO according to the color coding (red wire side onto the red wire side). 

To  keep  the  system  waterproof,  it  is  reccomended  to  use  the  heat shrinkable  tubing on the both male MSO connectors connected into  the original connectors from the tacho sensor and display unit. Place the MSO in a proper position and optionally, fasten the wiring using the electrical ties. Re-attach the plastic cover and pedal arm and the bike is ready to go.

Technical parameters

Dimension without wiring: 21 x 40 x 12mm

Supply voltage range: 5 - 15 V

Maximum current consumption: 100 mA

Maximum power usage: 1.5W

Mass: cca 30g

The voltage is lower then 20 V in all device and on I/O pins too