Everything you need to know about Brose electric bike motors
If you're looking for an electric bike, you'll find that there are many different motor manufacturers to choose from. Bosch and Shimano are well-known names, but there is one German manufacturer that is often praised by connoisseurs for its unique riding experience: Brose. With over 110 years of engineering experience and solid expertise in the automotive industry (particularly power steering motors), Brose approaches the electric bike market in a slightly different way.
In this blog, we take an in-depth look at the world of Brose. What makes these motors so special? What models are available? And what do you need to bear in mind when it comes to maintenance?
Written by: Hanna Stevens | January 27, 2025 | Reading time: 5 minutes
More about the author: Hanna Stevens
Hanna is an avid cyclist who loves exploring new routes and sharing her experiences to inspire others to get on their bikes more often.
Key findings
- Brose motors are renowned for their quietness and very natural driving feel.
- The Drive S Mag is one of the most popular e-MTB motors.
- Maintenance is important, but problems are usually easily fixable.
What are the typical characteristics of Brose?
Brose motors are distinguished by their specific driving characteristics, which many cyclists describe as very natural. This is due to several technical choices that differ fundamentally from those of the competition.
1. The inner belt
The most distinctive feature of the current generation of Brose motors (36-volt systems) is the internal transmission. Where many mid-drive motors use plastic gears, Brose opts for a carbon fiber-reinforced toothed belt.
This has two major advantages:
- Silence: the engine is virtually inaudible. Especially at high revs, the difference is striking: there is practically no humming or whistling.
- Vibrations: the belt dampens vibrations, ensuring smooth operation without transmitting vibrations to the pedals.
2. No resistance
Another important advantage is the dual freewheel technology. When the motor is turned off or when you ride beyond the 25 km/h assistance limit, the motor disengages completely. This means that there is no noticeable internal resistance. You then pedal almost as you would on a conventional, non-electric bike (apart from the weight of the bike). This is a noticeable difference compared to some older competing systems, where you felt like you were pedaling "in molasses" once the battery was empty.
3. Low-speed power
Brose motors are known for their ability to accelerate quickly, even at low speeds. This makes them ideal for starting on steep hills. The sensors measure the force exerted with great precision, allowing for immediate but very gradual assistance.
The range: from the city to the mountain peaks
Brose classifies its motors, which it calls the "Product Family," according to their type of use. The housings are often available in aluminum or lighter magnesium ("Mag").
Drive C (City) and Drive T (Trekking)
For everyday cyclists and long-distance enthusiasts, there are the Drive C and Drive T.
- The Drive C is designed for the city. It offers smooth and harmonious assistance, perfectly suited to the pace of urban traffic.
- The Drive T is the long-distance motor, optimized for efficiency and range, ideal for touring bikes and commuting.
Drive S (Sport) and S Mag
This is the flagship model for sporty cyclists. The Drive S Mag has been specifically developed for electric mountain bikes (e-MTBs).
- Lightweight: thanks to a magnesium casing, this motor weighs only 2.9 kg and is more compact than aluminum versions.
- Impressive torque: with 90 Nm of torque, it is a real powerhouse, capable of climbing the steepest hills.
- Flexible cadence: the motor remains powerful even at high speeds (up to 130 revolutions per minute), which is essential for MTB .
Drive 3 Peak (48 volts)
Brose recently announced a brand new generation: the Drive 3 Peak. It marks a break with the past in two ways:
- Higher voltage: the system switches from 36 to 48 volts, which reduces heat generation and improves efficiency.
- New design: remarkably, Brose has abandoned the famous belt on this high-end model in favor of a gear transmission to make the motor more compact. Despite this change, Brose promises that it will still run quietly.
Please note: this new system is not compatible with older 36 V components.
What types of bikes are these motors suitable for?
Thanks to the versatility of the "Drive" family, Brose motors can be found in various categories:
| Type of bike | Brose motor |
|---|---|
| E-MTB | Drive S / S Mag |
| City bike | Drive C |
| Trekking bike | Drive T |
| Speed pedelec | Drive TF |
| Cargo bike | Drive H |
Points of attention and maintenance
Although Brose motors offer a remarkable driving experience, there are certain technical aspects that owners need to be aware of. Experience in service workshops shows that the internal belt is a wearing part.
The toothed belt
All Brose 36 V motors are belt-driven. Although Brose has improved the quality (switching from fiberglass to carbon fiber), this belt can break or deteriorate over time. This is a maintenance issue comparable to replacing a chain: it is part of normal use, but can lead to a sudden loss of assistance.
Moisture and waterproofing
A known weak point during intensive use (especially MTB muddy conditions) is the seal around the bottom bracket. Water and dirt can penetrate and damage the bearings, particularly the needle bearings. Overhaul kits and improved seals are available to limit this problem.
Engine "skating"
Sometimes cyclists think that the belt is slipping, when in fact it is often a fault with the internal freewheel bearing (sprag bearing). When these pawls wear out, the motor no longer drives properly. This can be repaired, but it requires specialized tools.
Tip: Do not tamper with the electronic components of the motor yourself. Removing the electronic board may cause internal sensors to move, making them very difficult to reposition.
My three personal opinions on Brose
- Brose is ideal for cyclists who are looking for smoothness rather than raw power.
- Silence makes long rides less tiring than you might think.
- On technical e-MTB trails, Brose offers a more natural feel than many competitors.
Conclusion
Brose stands out in the electric bike market by focusing on riding feel and quietness. For cyclists who want assistance that feels like a "gentle push in the back" without the noise of a coffee grinder, Brose is an excellent choice. With the arrival of the new 48-volt system, the brand is showing that it continues to innovate toward ever greater power and compactness.
Whether you opt for a MTB equipped with the powerful S Mag or a comfortable city bike with a Drive C, you are choosing solid German engineering with a unique character.
Specifications summary table
| Specification | Brose Drive C | Brose Drive T (Trekking) | Brose Drive S Mag | Brose Drive 3 Peak (New) |
|---|---|---|---|---|
| System voltage | 36 volts | 36 volts | 36 volts | 48 volts |
| Couple | 50 Nm | 70 Nm | 90 Nm | 95 Nm |
| Support up to | 25 km/h | 25 km/h | 25 km/h | 25 km/h |
| Maximum assistance | 280 % | 320 % | 410 % | 420 % |
| Weight | approx. 3.4 kg (aluminum) | approx. 3.4 kg (aluminum) | 2.9 kg (magnesium) | 2,9 kg |
| Internal transmission | Belt (silent) | Belt (silent) | Belt (silent) | Gears (compact) |
| Ideal use | Urban routes | Long hikes | E-MTB, steep slopes | High-end e-MTB / cargo bike |
| Walking aid | Yes | Yes | Yes | Yes |
FAQ
Are Brose motors quieter than Bosch motors?
Yes, especially at high speeds, Brose motors are significantly quieter.
What is the service life of a Brose belt?
It depends on how it is used, but it wears out in a similar way to a chain.
Is Brose suitable for commuting?
Absolutely, especially Drive T.
Can all bicycle repair shops repair a Brose motor?
No, revision often requires specialized knowledge.
Is the Drive 3 Peak better than the S Mag?
This is another generation, mainly more powerful and more efficient.