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PearTune MSO 4.0 BAFANG M500

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PearTune is plugged into the e-bike system via compatible original plugs. No setup or diagnostics are required during installation. All configurations and adjustments to the settings of the respective e-bike are made automatically.

PearTune is wired between the speedometer sensor and the motor unit and between the display and the motor unit. The display power supply is used as the power supply. All data such as current, average and maximum speed, distance traveled, etc. remain on the display.

The PearTune MSO can be activated/deactivated at any time while driving by a double LONG press of the LIGHT button or by a short press of the + button and then immediately pressing the - button.

The only difference is that from the moment you install it, you determine how fast you go, not your bike. Top speed is limited only by pedaling frequency.

Download Handbuch_CZ here: Download Handbuch_DE here:


MSO-BF-M500: ① Unscrew the screws and remove the plastic cover from the
the motor on the other side than the transducer. All
The necessary cables and plugs are located under this cover in the
the space between the motor and the bike frame.

② Disconnect the 8-pin connector between the display and the motor and also
the 8-pin connector between the speed sensor (speed
sensor and the motor.

③ Connect the two corresponding connectors of the MSO instead of the original ones.
Connections for display and speed sensor on the motor unit = !!!
IMPORTANT!!! = these connections from PearTune are marked
RED and must be connected to the engine instead of the original ones!!!
And then the original display connector and the original sensor connector
Connect the speed sensor, which was previously disconnected from the engine, to the chip = to the
NOT marked connections!!!

All connectors have a code, this one is wrong
there is only one way to connect them all.

④ Place the MSO in the correct position (recommended in the frame
if possible, ideally with the chip body facing up =
moisture protection) and optionally fix the wiring. again
place the plastic cover, tighten the screws previously removed and the wheel
is ready to drive again.

use of

MSO-BF-M500: PearTune MSO can be enabled/disabled at any time
while driving by LONG pressing the LIGHT button twice or
by briefly pressing the + button and then immediately pressing the - button.
The original function of these keys remains unchanged. PearTune MSO activity
is shown on the display with a value of 9.9 km/h or 6.2 mph.
(PearTune is enabled) and 2.5 km/h or 1.6 mph (PearTune is
disabled) for a few seconds after activation/deactivation. V
if you have the "Still ON" version, you don't need to activate anything =
The chip is automatically activated/deactivated when the bike is switched on or off. V
If you have SMART version 4.0, you can use the buttons in
SERVICE MENU of the chip can be changed at will.

If you want to install PearTune MSO on a new e-bike,
make sure you drive it at least 1 km before the PearTune
MSO is installed.

It is possible to make a long journey at speeds over 25 km/h with assistance
with motor assistance, some of the indicators on the display may not respond to yours immediately
actual values. After a period of time without motor assistance or when
At speeds below 25 km/h, these values ​​should always be adjusted. After
For longer journeys at higher speeds, we recommend that you ride the e-bike immediately.
do not park the bike immediately. The easiest way is to switch off the e-bike
or automatically, or leave the bike on when you finish the ride,
until the display shows 0.0 km/h or 0.0 mph.

Do not update the software after installing PearTune MSO,
the manufacturer cannot be held responsible if the chip is damaged after a software upgrade
not working properly.

Installation guides and videos for all PearTune MSO products
are also available on our website:

or on our YouTube channel:


PearControl sro
Prikopy 1889
393 01 Pelhřimov

Technical parameters

Dimensions without cable: 18x 15x 3mm
Supply voltage range: 5 - 15 V
Maximum current draw: 100mA
Maximum power consumption: 1.5W
Weight: 10 - 20g
No voltage anywhere in the device, neither inside nor at the input/output
pins exceeds 20V

The manufacturer reserves the right to make changes. This manual is an integral part of the device sold. By using the PearTune MSO device, the user agrees to use the modified e-bike in accordance with the applicable legislation of the country of destination and thus also off-road; he is therefore free to use it only on his own property or on areas designated for this purpose. The user also acknowledges that the operation of bicycles outside of one's own or designated property with deactivated but installed PearTune MSO devices may not be in compliance with the law. The manufacturer does not guarantee that the bicycle warranty will not be violated or that the e-bike system cannot be damaged or blocked. The manufacturer declines all liability for any damage to health or property related to the installation or use of this product.

The manufacturer has a certificate for testing electromagnetic compatibility - compliance with EU regulations (CE marking) and a certificate for restricting the use of certain hazardous substances (RoHS marking).