Unlock the speed limit of your electric bike with a tuning dongle kit. Unleash the full speed of your ebike engine and ride it like a derestricted e-bike should be!

Compatible with the latest Bosch 2021 FW upgrade (increased torque to 85NM)
Compatible with all BOSCH engines (2013 – 2021) such as Active Line, Active Line Plus, Performance Line, Performance CX Line, including motors of the 4th generation (MY2021) with anti-tuning software.
The VOLspeed tuning chips are one of the most popular e-bike tuning devices on the market. Their popularity is due to their unique engine optimisation feature that allows to reduce the annoying ‘wall effect’ of the engine when reaching maximum speed. This tuning chip completely unlock your engine to 99km/h. Another appealing feature is that the speed limit can be adjusted for reduced battery consumption. Even with the tuning active all data on the display remain accurate. 
The tuning hardware is completely incapsulated and protected by a rigid casing which guarantee for toughness, impermeability, and thus hardware longevity. The VOLspeed is manufactured in Germany.
Individual activation code to prevent unauthorised riders to activate the tuning. 
Completely unlock the engine for speed up to 99km/h.
Set your own speed limit to adjust or reduce battery consumption.
All settings can be easily made using the display control buttons.
The tuning is always switched off after switching on the bike.
Correct total mileage of the bike even after removing the tuning module, as the kilometres are tracked in the engine control by the tuning module.
Range calculation remain accurate even with the tuning active.
Set a ‘softer control behaviour’ (dynamic mode) which reduces the annoying engine abrupt cut-off. This allows for a more pleasant driving experience and a constant pedal stroke. 
Battery percentage remain accurate even with the tuning activated. In active mode the battery range is calculated as: Interval: 4 second range, 1 second battery level.
Workshop mode: Deactivate the module completely, e.g. if a workshop visit is due.
The module is around 40 percent smaller than in the previous models for a better fit into the engine compartment. 
The electronics are completely encapsulated in the housing, making them absolutely waterproof.
Does not require any diagnostic tool for installation. 
The VOLspeed tuning chip comes with original plugs and colour-coded wires for an easy and perfect fit. Installation manuals and videos provide step by step detailed instructions and are easy to follow and understand. The VOLspeed does not require any diagnostic tool for installation.
The tuning module is plugged into the connections of the drive unit. These are located under the left engine cover. Depending on the type of bicycle, you will need different tools to remove this cover. Most of the time you will need an ISIS crank puller and a Torx TX20 wrench. You can purchase a crank puller from us. 
Note COBI.bike / SmartphoneHub
If you use the tuning together with a COBI.bike or SmartphoneHub, the operation changes. We have summarized the
underlay in the following instructions: AddOn_VOLspeed_Bosch_V3_Cobi_Rev1.pdf By the way, an individual activation code cannot be used when using COBI or SmartphoneHub!
Note software updates
We generally advise against software updates for the Bosch drive system after installing a tuning module. It cannot be guaranteed that the tuning module will also be compatible with future software versions of the drive system.
Technical specifications
Case dimensions: 37mm x 19mm x 9mm
Cable length: approx 180mm
Weight: 0.025kg
Power consumption: 0.2W
Supply voltage: 12VDC
WEEE reg. No. DE35476192
The operation of modified electric bike on public roads may be against the law in some countries. The seller takes no responsibility for damages resulting from the use of tuning products. Electric bikes equipped with tuning products can be used exclusively on private property and entirely at one’s own risk. The use of tunings may void the warranty of your e-bike. We strongly recommend using safety features and protective gear to prevent injuries at higher speeds.


The Volspeed 3 Bosch has been released in January 2021 and it is compatible with all Bosch engines from 2014 to 2021 (Gen4/ Gen3/ Gen2 engines) and all FWs including the latest 06/2021 FW which allows to increase the engine torque from 75 to 85Nm.


The infamous Error code 504 is an anti-tuning algorithm that is triggered when certain riding parameters are exceeded (anti-tuning measures). The algorithm relies on data collected from the engine software such as speed, cadence, battery consumption, and other engine parameters to determine if the engine has been derestricted. 

According to tuning manufacturers error 504 has been triggered on only 1.5 % of the Bosch engines. In case the error 504 is triggered, we strongly advise to remove the tuning and to ride the bike for few days without the tuning installed. This will allow the bike to clear the 504 error code and reset the engine to pre-code conditions. To avoid the error to occur again we suggest to reinstall the tuning and reset the max speed to 35 km/h since no error 504 code has been reported above the 35 km/h. 

NOTE: It is not uncommon for the 504 error to also appear on standard bikes that have never been derestricted before. 

GEN 4: Bug in motor firmware can cause an error 504 (confirmed by Bosch, update recommend) No errors were reported so far. This update was to fix the 504 problem. & Some customers had reported an error 504. It seems that the error only occurs when a speed limit of 45kph or higher is set. For the moment we recommend to set a maximum limit of 35kph to be save.

We do strongly believe that Bosch will again release an update regarding the tampering detection as with the

GEN 3:
up to no problems so far same as gen 4

GEN 2:
No error code 504 have been reported so far. 

There is also some more reasons for a 504 error:
- defective bearings inside the motor
- a defective free hub inside the motor
- high mechanical noise from the motor
- misaligned speed sensor magnet
- crashes with the bike


Engine manufacturers are constantly working on improving their engines. They do have access to a large database of information as data is transmitted to the manufacturer each time an engine is hocked into the dealership diagnostic tool.
This data allow the manufacturers to have a better understanding on how the engine behaves/ perform under a wide range of circumstances.
Through FW updates the manufacturer is able to improve several aspect of the engine such as performance, power delivery, battery consumption and management, to smooth the engine engagement/disengagement, and to correct other parameters.
We strongly advise NOT to perform any FW updates. Updates may be possible only after they have been proven to be safe. 

Anti-tuning errors are also triggered by other factors and may not be directly attributed to anti-tuning measures. 
As an example, a FW update may be released to improve the smoothness of the engine during engagement and disengagement. This is only possible by slightly manipulating the voltage of the speed sensor. The change in the speed sensor voltage has a direct effect on the magnetic field and thus on the communication between the speed sensor and the magnet. This may not be a problem on a standard bike (restricted engine up to 25 or 35km/h) however, it may become a problem at speed higher than 32 km/h especially if the magnet is integrated into the brake rotor.

It is for this reason that we strongly advise NOT to perform any FW updates until proven to be safe. 


The tuning is undetectable by the dealer diagnostic tool however we strongly advise to remove the tuning before taking the bike in for a service.
Please make sure to request to NOT perform any FW update or to hook the bike on the diagnostic tool. 


The tuning remove the annoying speed limitation of your engine and does not interfere with the engine power and torque. With the tuning active is hard to determine the battery consumption since there are many factor involved such as riding style, terrain, cadence, and etc. As a role of thumb, aspect battery drainage to be in the +/-10%.