E-bike - which motor really suits you?
Anyone looking to buy an e-bike quickly comes across one of the most important questions of all: Which motor is the right one? 35 Nm, 45 Nm, 65 Nm, 85 Nm, or even 100 Nm? Mid-drive motor or rear hub? Is 250 watts enough? And why do some e-bikes feel completely different despite similar specifications?
By Vincent Augustin 3 minutes read time
Published: May 16, 2026
The good news: there is no "best" motor. What matters is how and where the e-bike is used. That's precisely why it's worth understanding the most important differences.
You can also find more background information on torque here:
What makes a good e-bike motor?
Many buyers first look at the wattage. But the pure motor power says surprisingly little about the riding experience.
More on this here: 250 watts, 500 watts or 750 watts – how much motor power do you really need for an e-bike?
More important are usually:
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Torque (Nm)
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Motor characteristics
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Sensor system
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Assistance behavior
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Cadence
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System weight
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Efficiency
Torque describes the force with which the motor assists. A high Nm value is particularly noticeable when starting, on inclines, or with luggage.
The fundamental relationship behind this is:
M = F x r
Where:
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(M) = Torque
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(F) = Force
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(r) = Lever arm
Which motor for which purpose?
35–45 Nm: City & Everyday
For classic city e-bikes or light urban bikes, 35 to 45 Nm is often perfectly sufficient. These motors:
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operate efficiently
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consume less energy
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ride smoothly
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are often lighter
Especially on flat terrain or when commuting, an extremely powerful motor is often unnecessary.
50–65 Nm: The All-rounder
This range is the sweet spot for many riders:
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Trekking tours
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Commuting with luggage
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Light hills
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Longer distances
65 Nm already offer powerful assistance without range and wear suffering too much. Many modern trekking and SUV e-bikes fall into this category.
75–100 Nm: Mountains, Trails & Cargo
Those who regularly:
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ride steep ascents
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pull heavy trailers
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are off-road
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use an E-MTB
benefit from powerful motors with 85 Nm or more.
But more power also has disadvantages:
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higher energy consumption
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increased wear on chain and cassette
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higher weight
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more aggressive riding feel
Therefore: More torque is not automatically better.
Mid-drive motor or rear hub motor?
In addition to performance, the position of the motor also plays an enormous role.
More on this: What is the difference between a mid-drive motor and a rear hub motor?
Mid-drive motor
The mid-drive motor is located at the bottom bracket and is the most common design today.
Advantages:
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natural weight distribution
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good riding feel
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strong assistance on hills
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efficiently usable with gears
This is why manufacturers like Bosch focus heavily on mid-drive motors, especially in the premium segment.
Rear hub motor
The rear hub motor pushes the bike directly from behind.
Advantages:
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sporty riding feel
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quiet operation
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often cheaper
Disadvantages:
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poorer weight distribution
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less efficient on steep hills
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rear wheel maintenance is a bit more complex
Why two motors with the same power can feel completely different
An e-bike motor does not work in isolation. Modern systems constantly analyze:
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pedal pressure
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cadence
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speed
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incline
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acceleration
This creates the actual riding experience.
These articles also show how important cadence is:
Many motors work particularly efficiently in the range of about 60–90 RPM.
The assistance levels make the difference
Not only the hardware counts. The software also massively influences the riding experience.
More on this: Pedal assistance on an e-bike – how it really works
Modern systems usually offer:
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Eco
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Tour
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Sport
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Turbo
However, the stronger the assistance, the higher the energy consumption.
Peak power vs. continuous power
Many motors deliver significantly more power for a short time than continuously.
More background: Peak power vs. rated continuous power – what does that mean for an e-bike?
Especially when starting or on steep hills, significantly more power is briefly called upon. This also explains why a nominally "250 watt" motor can feel surprisingly powerful.
How much wattage does an e-bike really need on a hill?
On a hill, the power requirement increases dramatically.
Physical power is simplified as:
P = F x v
The steeper the hill and the higher the total weight, the more power is needed.
More on this: Effort on the slope – how many watts does your e-bike really need when starting?
Conclusion: Which e-bike motor is right?
The choice of motor primarily depends on the intended use:
| Area of application | Recommendation |
|---|---|
| City & everyday | 35–45 Nm |
| Tours & commuting | 50–65 Nm |
| Mountains & off-road | 75–85 Nm |
| Cargo & extreme trails | 100 Nm+ |
More important than pure performance data, however, is the interplay of:
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Torque
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Motor position
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Sensor system
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Software
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Cadence
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Weight
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Efficiency
A harmonious 50 Nm motor can often feel more pleasant in everyday use than an aggressive 100 Nm drive.
Ultimately, it's not the biggest number on the spec sheet that counts – but how well the motor suits your own riding style.
