SpeedFun Furious Evo for Bafang M400 and M420

108,82€ – 118,46VAT incl.

peedFun Furious Evo is an ebike tuning that allows you to remove the 25 kmH speed block by fully exploiting the potential of the Bafang motors.

This ebike tuning device is specially designed to unlock the speed of Bafang M400 and M420 motors mostly mounted on Bottecchia, Montana, Torpado and Vektor ebike.

All SpeedFun Furious Evo speed release devices can be activated and deactivated at any time even without connecting to the light output.

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What is Bafang M400 and M420 SpeedFun Furious Evo ebike tuning?

The function of the Furious Evo tuning device for Bafang M400 and M420 is to electronically manipulate the rotation speed of the rear wheel and to communicate to the motor a speed always lower than 25 KmH in order to obtain a real speed with very high active motor. The maximum speed limit will therefore be dictated by the power of the engine added to the power expressed by one’s legs (info).

When the tuning device is active, having no communication with the display, it will show the halved data on the display starting from a certain threshold.

SpeedFun Furious Evo can be activated and deactivated at will and maintains the setting even after the ebike is turned off. It can be installed on ebike with Bafang M400 and M430 motors regardless of the type of display or side control of the ebike.

The Furiosu Evo tuning device for Bafang M400 and M420 can be activated/deactivated by simply pressing the ebike’s light button. If the ebike already has the lights connected to the light output, or if it is not possible to use it, it will still be possible to activate/deactivate the tuning with a very practical system (for more information see the instructions here). The device is supplied plug and go ready to use and is installed in a very simple way thanks to the original connectors with which no physical modification of the ebike is necessary.


Ebike with Bafang M400 and M420 motors where the Furious Evo device was successfully installed

(this list is illustrative and not exhaustive)

– Torpado Thor
– Torpado Xanto Z
– Bottecchia BE 31 Kripton E-MTB 27,5″
– Bottecchia BE 20 e-bike TRK lady 28″

– Bottecchia BE 18 e-bike TRK man 28″
– Montana E-Vort 29″ E-MTB
– Vektor Krug 27,5″

The main features

– Totally invisible

– It can be assembled/disassembled at any time

– Equipped with original connectors that do not require any physical modification to the ebike wiring

– Allows you to remove the limit of 25 KmH up to speed without limits (info)

– Can be installed in minutes, ready to use, plug and go!

– Suitable for M400 and M420 motors mostly mounted on Bottecchia, Montana, Torpado and Vektor ebikes

– Compatible with any type of display or command

– The device can be activated/deactivated by pressing the lights button. If the light output is busy, it can still be activated/deactivated in a very practical way (more info here)

– Does not need external batteries or power supply.


Assembly and Use Instructions

Instructions for assembly and use Furious Evo for Bafang M400 M420 M300

Video Assembly Instructions

How to install SpeedFun Furious tuning ebike speed limiter release kit with Bafang M420 motor

Additional information

Increase assistance up to over 60 Km/h

Display data:

Shows real data up to 20 km/h. Beyond 20 Km/h the data are distorted on the display or on the app

Motor compatibility:

Compatible with Bafang M400 and M420 motors


Activation and deactivation of the device with the lights button or idle pedaling (for more information see instructions)


The device measures 31 x 16.5 x 7 mm


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Once the SpeedFun speed release device has been installed, the electric bicycle, if exceeding the limit of 25 kmH, is equated to a moped and as such, if traveling in public places, it needs to be homologated-registered by the Civil Motorization. subject to the payment of the road tax and insurance coverage, must have a license plate, cannot circulate on cycle paths and the driver is obliged to drive with a license and must use a helmet. In addition, driving a motor bicycle equivalent to a moped that does not comply with the aforementioned provisions entails the administrative seizure of the vehicle and financial penalties that vary according to the infringement committed. The manufacturer of the speed release system declines all responsibility for any damage caused to pedal-assisted bicycles on which the device is mounted as well as direct or indirect damage to people or things.
SpeedFun – Phase B snc declines any responsibility for any anomalies caused by the anti-tuning defenses that the engine manufacturers could activate.
Remember that the modification to the bicycle could invalidate the manufacturer’s warranty.

The operation of the SpeedFun devices is guaranteed for the software versions of the ebikes released up to the date of purchase of the device itself.
If the ebike is subsequently updated with software for which the SpeedFun device has not been designed, its failure may occur.
Before updating your engine, it is necessary to check the compatibility with your SpeedFun device.

NB: All the brands mentioned on this site are named exclusively to identify the models of engines and bicycles on which our devices are compatible. They are the property of the respective owners and are in no way related to our company.

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