How To Derestrict a Bosch Gen 4 eBike in 2021


How to Derestrict an eBike with a Bosch Gen 4 motor in 2021? 

In this blog post we are going to explain how you can remove the speed restriction on your Bosch eBike by using either a VOLspeed V3 or Speedbox 3.0 tuning chip. Before we start, please note that removing the speed limit on your eBike can void your warranty, eBikes with the speed restriction removed are illegal and only to be used on private land. 


How does tuning a Gen 4 motor work? 

The Gen 4 Performance Line CX motor was released in 2020 and is Bosch's motor powerful eBike motor to date providing 85nm of torque. This particular motor is the most popular for eBikes in 2021 with the likes of Cube, Cannondale & Whyte choosing it as their motor of choice for their eBikes. The Gen 4 motor is extremely powerful - it will tackle the steepest climb with ease. However, despite all the power the 25km/h speed restriction will kick in, meaning that on the flat terrain you will be pedalling against the motor, unable to go any faster. For many, 25km/h is enough speed for an eBike. However, for those of us that want to be able to ride a bit faster, you will need a tuning chip. A tuning chip essentially removes the 25km/h speed restriction on your eBike and allows you to continue to pedal with assistance from your Performance Line CX motor. 

VOLspeed or Speedbox? 

There are a variety of different tuning chips available for the Bosch Gen 4 motor. In this section we are going to discuss the two most popular eBike tuning chips; VOLspeed V3 and Speedbox 3.0. We are aware of other options available, however due to the similar price points and reliability of these particular options we believe that these two are the best chips available for the Performance Line CX motor. 

VOLspeed V3 for Bosch

The VOLspeed V3 tuning chip is a great option for Bosch eBike owners. It is compatible with all Bosch eBikes from 2014 - 2021 meaning that it can be used on a huge variety of different Bosch motors. Good news if you are currently on a 2018 Bosch Active Line but have plans to upgrade to Gen 4 in the future! 

The reason why we love this tuning chip so much is that not only does it remove the 25km/h speed restriction but it allows you to set a new max speed limit. This is a brilliant feature as it keeps you in control of the speed and gives you flexibility as it can be adjusted at anytime. After installing the chip and completing the initial setup, you simple press the minus button on your display for 3 seconds and the chip is active with your new max speed limit set. The VOLspeed V3 is compatible with all Bosch display units; Purion, Nyon, Kiox & Intuvia. 

How to setup a VOLspeed V3 

Speedbox 3.0

Speedbox is an eBike tuning OG, they have been around for many years and have the best selection of tuning chips available for all of the major eBike motors. In January 2020 they released their Speedbox 3.0 made specifically for the Bosch Gen 4 motor. Prior to the 3.0 they had the extremely reliable Speedbox 2.0 chip however due to the introduction of Anti-tuning software from Bosch, this was no longer compatible and they launched the new 3.0. 

As you can see from the photos, the VOLspeed and Speedbox are very similar in looks, with both tuning chips connecting in exactly the same way. Unlike the VOLspeed, the Speedbox doesn't require an initial setup so it is quicker to get up and running. You simply press the 'Walk' button on your handlebar control and 6.2km/h will appear, meaning the tuning chip is active and the 25km/h restriction is removed. To turn the chip off, you simply press 'Walk' again and 1.6km/h will appear. Similar to the VOLspeed V3, the Speedbox 3.0 does allow you to set a new maximum speed limit however it is not done at the beginning of the installation. To set a new max speed, you need to press 'walk' and flick through the different eBike modes on your display. Compared to the VOLspeed V3 we found this feature to be quite difficult to use so we definitely feel the VOLspeed is better when it comes to setting a new max speed. 

One key difference between the two tuning chips is that when using the Speedbox 3.0 on a Bosch Gen 4 motor, you are required to leave the eBike on after finishing a ride until the value of 0.0km/h appears on the display. This countdown is in place to prevent the eBike from recognising that a tuning chip has been fitted. During the countdown a timer will appear on the display, showing you how long left until it's complete. For best practice we recommend leaving the eBike to turn itself off once the countdown is finished. 

How to setup a Speedbox 3.0

Will a tuning chip cause my eBike to go into Limp Mode?

The dreaded 'Limp Mode' is one phrase that all riders with Bosch motors will be aware of. Essentially it is where the eBike shuts down, an error code 504 appears on your display and means riding a very heavy bike back home with no motor assistance. The 504 error appears when the Bosch motor detects that a tuning chip is fitted. The good news is that this error can be easily cleared by riding for 90 minutes unassisted or doing this clever drill hack. It's worth noting that the 504 error has been known to appear on eBikes WITHOUT tuning chips fitted, if you are running the software, we highly recommend updating to the newest version to avoid any unwanted errors. From experience we have found it very rare for an eBike to go into limp mode with a VOLspeed V3 or Speedbox 3.0 fitted. If you set a sensible new max speed of <45km/h on the VOLspeed V3 and follow the countdown each time on the Speedbox 3.0 you shouldn't have any problems. 

Please note it is not 100% guaranteed, so if it does happen, don't worry, simply reset the eBike and you are good to go again. You can reset the eBike up to 3 times yourself. 

Which tuning chip should I choose? 

So you've read through the details of each tuning chip and are now ready to make a decision. We have tested both of these tuning chips extensively and believe that both are excellent choices for the Gen 4 Performance Line CX motor. However, if we had to choose between the two, we would opt for the VOLspeed V3 for two reasons;

1. Easily set a new max speed limit on your eBike

2. No countdown after completing a ride


We hope that you found this blog useful, be sure to follow us on Facebook and subscribe to our newsletter. Let us know in the comments if you have any questions, we'd love to hear from you! EBIKE TUNER are an authorised distributor of Speedbox tuning chips and the UK's exclusive distributor of VOLspeed tuning chips. Check out our website for more info!


Please note that removing the speed limit on your eBike can void your warranty, eBikes with the speed restriction removed are illegal and only to be used on private land.


  • Hi i have cube fitted with a bosch gen4 motor with latest update nov 2020. A couple of my mates have had problems with their speedbox error code multiple times on rides. Which box is the most reliable please?

    Mike Chilton
  • Hi thank you for your very good article. Questions : would the volspeed v3 work with Bosch CargoLine CX with 2021 update (85Nm) ?


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