Comparison

Comparison tables

Here you’ll find everything you need to know about Bosch e-bike motor generations, compatibility with the EBT Unlock Key, and how software tuning compares to hardware-based solutions. Jump directly to the section you're most interested in:

• 1) Bosch Motor Generations Explained
• 2) EBT Unlock Key – Overview Table
• 3) Bosch Gen4: BES2 vs BES3
• 4) Software vs. Hardware Tuning

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1) Detailed Overview: Bosch Motor Generations

To help you better understand which Bosch e-bike motors are compatible with the EBT Unlock Key, we’ve included an overview of the differences between Gen1, Gen2, Gen3, and Gen4 systems. Learn which version you have – and whether browser-based tuning is possible.

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Bosch Gen1 Tuning – Classic Line

Bosch’s first generation, often referred to as the Classic+ Line, includes systems with either HMI or Intuvia displays. The EBT Unlock Key only supports the Intuvia variant (BES1), which shows full and correct speed values. HMI displays are not supported. These early systems are typically found on older city or trekking bikes. Unlock Bosch Gen1 Classic+ Motor

Bosch Gen2 Tuning – Active & Performance Line (2014–2017)

Gen2 motors brought a significant step forward in Bosch’s evolution. These systems use BES1 connectors and are compatible with the EBT Unlock Key. However, due to system design, speed values are shown at half the actual speed when unlocked. This affects displays such as Purion, Intuvia, and Nyon. Unlock Bosch Gen2 Performance Line Motor

Bosch Gen3 Tuning – Active Line Plus & Performance (from 2018)

Gen3 systems marked Bosch’s transition to the BES2 connector (round plug). The EBT Unlock Key works well with these systems, but like Gen2, speed values appear halved on the display. Most commonly used on city and hybrid bikes, these systems offer a good balance between performance and weight. Unlock Bosch Gen3 Active Line Plus Motor

Bosch Gen4 Tuning – Performance Line CX (up to 2022)

Gen4 Performance Line CX motors are widely used in eMTBs and trekking bikes. The key distinction is between BES2 and BES3 versions. If your Gen4 motor uses the round charging port, it’s BES2 – and fully compatible with the EBT Unlock Key. If it has a square charging port and uses the Smart System (e.g., Kiox 300, LED Remote), it’s BES3 – and not compatible. Unlock Bosch Gen4 Performance Line CX Motor

Still unsure? Use our comparison table below or check the shape of your charging port. You can also email our support team with a photo – we’ll help you identify your system.

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2) EBT Unlock Key for Bosch at a glance

The following table provides a compact overview of all Bosch motor generations from Gen1 to Gen4 – including connector type (BES1, BES2), display compatibility, and browser-based tuning support via the EBT Unlock Key. Unsupported systems (e.g., Gen1 HMI, Smart System BES3) are clearly marked.

Comparison Table: EBT Unlock Key for Bosch motors

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3) Comparison of Bosch Gen4 motors

Compatibility Tip: Not all Gen4 motors are the same. There are two versions:

• Gen4 with BES2 (round charging port): Compatible with the EBT Unlock Key
• Gen4 with BES3 (square charging port / Smart System): Not compatible

In the UK and other markets, the BES3 version is often referred to as “Bosch Smart System” or “Performance Line CX with LED Remote.” If your Bosch Gen4 motor has a square charging port and uses a Kiox 300 or LED Remote, it is likely a BES3 system.

If you're unsure whether your bike uses BES2 or BES3, just compare your charging plug:

The EBT Unlock Key is compatible with the round plug version (BES2):

Comparison Table: Bosch Gen4 BES2 vs BES3

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4) Comparison of software tuning and hardware tuning

There are many perspectives when it comes to tuning – and no one-size-fits-all solution. This comparison aims to help you find your own position by highlighting the differences between software-based and hardware-based tuning approaches.

While hardware solutions like tuning chips and dongles have been around for years, software tuning represents a modern, flexible, and minimally invasive alternative. It can be a valuable upgrade for technically savvy riders looking for control, reversibility, and convenience.

Comparison Table: Software Tuning vs Hardware Tuning

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