Bosch e-bike motors at a glance: From the first generation to the Performance Line CX Gen 5

Bosch is one of the leading manufacturers of e-bike drive systems. Since the introduction of the first motor in 2010, the system has been continuously developed – with each generation, performance, efficiency, and riding experience have been improved. Today, the Bosch Performance Line CX Gen 5 (BDU38) with 100 Nm of torque is considered the benchmark in the e-bike world. But how did this come about? A look at the development of Bosch motors reveals why the current generation is so powerful.

By Vincent Augustin 3 minutes read time

About the author Vincent Augustin

Vincent founded MYVELO together with Fabian. The two share a long-standing passion for cycling. Together they have cycled thousands of kilometers and fought for victories in the German racing bike league. The idea of founding MYVELO arose from their many years of experience and knowledge of what makes a good bike. Find out more about MYVELO now

Published: November 12, 2025 | Updated: May 15, 2026

The beginnings: Bosch Active Line and Performance Line (2010–2014)

With the first generation, Bosch launched the Active Line and Performance Line in 2010. These motors were designed for everyday use and leisure activities – quiet, reliable and with moderate torque (approx. 50–60 Nm).

They laid the foundation for success: precise pedal power support, an intuitive riding experience, and the modular system of battery, motor, and display.

Features of the first generation:

Mid-engine concept
Torque: approx. 50–60 Nm
Assistance up to 25 km/h (pedelec)
Early on, still without e-MTB mode

These motors were ideal for city and trekking e-bikes, but still had potential for optimization in terms of weight, noise level and power output.

Second generation: More performance for everyday life (2014–2017)

With the second generation, Bosch introduced an improved motor control system. The Performance Line CX system came into play for the first time – developed specifically for sporty e-bikes and e-MTBs.

Important new features:

Significantly higher torque (up to 75 Nm)
Improved sensors for more sensitive support
Smaller design and more efficient power transmission

This established the Bosch CX motor as the benchmark in the sporty segment. Riders benefited from natural pedal assistance – especially on steep climbs and technically demanding terrain.

Third generation: Active Line Plus & improved smoothness (2017–2019)

The third generation focused primarily on comfort. The new Active Line Plus motor offered smooth, barely audible assistance. The internal gearing was also revised, resulting in less resistance above 25 km/h.

Highlights:

Compact, lightweight engine
Reduced pedaling resistance
Ideal for touring and city e-bikes

While the CX series became sportier, Bosch focused here on pleasant driving dynamics for commuters and touring cyclists.

Fourth generation: Performance Line CX Gen 4 (from 2020)

The Bosch Performance Line CX Gen 4 (BDU37) marked a major technological leap. With 85 Nm of torque and a significantly more compact housing, the motor weighed around 25% less than its predecessor.

New features:

85 Nm torque
Dynamic eMTB mode with progressive support
Reduced internal resistance
Compatible with the new PowerTube batteries

The motor reacted faster and more precisely, offering a very natural riding feel. The CX Gen 4 quickly established itself as the benchmark, especially for e-MTBs and high-end trekking bikes.

Fifth generation: Bosch Performance Line CX Gen 5 (BDU38) – The pinnacle of evolution

With the fifth generation , the Bosch Performance Line CX Gen 5 (BDU38) , Bosch is launching its most powerful mid-drive motor to date.
It delivers up to 100 Nm of torque , operates extremely quietly and reacts lightning-fast to every pedal movement.

Technical highlights of Gen 5:

100 Nm torque
Maximum efficiency through optimized sensor technology
Improved heat dissipation for long uphill drives
Seamless integration into the frame design
Compatible with Bosch Smart System (Connectivity, E-Bike Flow App, eShift, ABS, etc.)

The motor reacts intuitively, offers powerful support in eMTB and turbo modes, and impresses with its smooth running.
For ambitious drivers seeking maximum performance and control, the Gen 5 is currently the benchmark.

Conclusion: From a solid drive system to a high-tech system

In about 15 years, the Bosch motor has evolved from a simple auxiliary drive to an intelligent, networked high-performance system.

With the Performance Line CX Gen 5 (BDU38), Bosch reaches a new dimension in terms of efficiency, torque and integration.
Whether in an e-mountain bike, trekking bike or SUV e-bike – this motor delivers the power you can feel in everyday life and off-road.

Anyone looking for an e-bike with state-of-the-art Bosch technology will find models at MYVELO with the Bosch Performance Line CX Gen 5 , which combine power, comfort and connectivity at the highest level.

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Further information and FAQs about Bosch e-bike motors

Get advice from cycling enthusiasts

Which Bosch motor generation is in my e-bike?

The question of which Bosch motor generation you have is one of the most frequently asked by e-bike riders – and for good reason. Depending on the generation, performance, sensor technology, software features, noise levels, and compatibility with batteries and displays differ significantly.

The easiest way to identify your motor is via the Bosch display or the Bosch eBike Flow app. Modern systems from around 2022 onwards can be connected directly to your smartphone. The app displays the exact motor type (e.g., Performance Line CX, CX Race, or Cargo Line) as well as the respective system (Bosch Smart System or classic Bosch System).

For older e-bikes, it's worth taking a look at the motor itself. The housing usually has a type plate with the model name and serial number. This information allows you to clearly identify the generation. The shape of the motor also provides clues: Earlier Bosch drives (Gen 1 and Gen 2) are larger and more angular, while newer generations appear more compact and integrated.

Another indicator is the e-bike's year of manufacture:

2011–2013: Bosch Classic Line (Gen 1)
2014-2019: Active/Performance Line (Gen 2 & 3)
2020-2021: Performance Line CX Gen 4
From 2022: Performance Line CX Gen 4 with Smart System
from 2024/2025: Performance Line CX Gen 5

The built-in display also provides further information:
Intuvia and Purion indicate older systems, while Kiox 300, Kiox 500, or the LED Remote clearly belong to the Smart System.

In summary: Using the app, the type plate, the year of manufacture, and the display, you can usually determine your Bosch motor generation quickly and reliably – an important basis for updates, spare parts, and accessories.

What are the differences between the Bosch motor generations?

Bosch has consistently developed its e-bike motors over the years. While the first generations were primarily designed for reliability and basic assistance, today's drives stand for high torque, intelligent sensors, and connectivity.

The first generation (Classic Line) offered around 50 Nm of torque and a comparatively coarse level of assistance. It laid the foundation for the e-bike boom but is now technically outdated.

With Gen 2 and 3, Bosch introduced smaller, lighter motors. For the first time, the Active Line and Performance Line differed clearly in their intended use and character: comfort-oriented versus sporty. The riding experience became more natural, and noise levels were reduced.

A true milestone was the Performance Line CX Gen 4. With 85 Nm of torque, a compact design, and significantly improved responsiveness, it set new standards in the e-MTB sector. Features like eMTB mode provided adaptive support depending on pedal pressure.

Gen 5 takes things a step further. It offers not only more control and efficiency, but also finer power delivery, improved thermal management, and an even more natural riding feel. Combined with the Bosch Smart System, regular software updates, riding mode adjustments, and app integration are key features.

In short: Each generation has brought more power, better control, and greater integration – with Gen 5, Bosch has currently reached its most technologically advanced level.

Is it worth upgrading to a newer Bosch motor?

Whether upgrading to a newer Bosch motor is worthwhile depends heavily on the intended use, riding style, and existing system. A direct motor swap is usually not possible in practice, as the motor, battery, display, and frame are all designed to work together. Therefore, an "upgrade" typically involves purchasing a new e-bike.

For riders with very old Bosch systems (Gen 1 or early Gen 2), the difference is enormous. Modern motors offer significantly more torque, quieter operation, greater range, and a more natural riding feel. The leap to the Performance Line CX Gen 4 or 5 is particularly noticeable in the e-MTB sector.

Owners of a CX Gen 4 without a Smart System, on the other hand, primarily benefit from digital features, customization, and software updates, rather than a pure performance increase. Performance remains at a very high level.

For those who frequently ride off-road, tackle technical trails, or value connectivity, adaptability, and future-proofing, switching to a bike with a CX Gen 5 or Smart System is especially worthwhile.

Conclusion: An upgrade is particularly worthwhile if you're coming from a very old Bosch motor or specifically want to benefit from new riding modes, improved control, and the digital ecosystem. For many riders, it's less of a necessity and more of a noticeable gain in comfort and performance.