Is 40 Nm enough for hills?
You’re about to buy a new e-bike, and suddenly you’re bombarded with technical terms: wattage, battery capacity, and especially torque, measured in Newton-meters (Nm). You spot a great e-bike equipped with a 40 Nm motor, but you live in a hilly area or want to take it on vacation. This raises a crucial question: Is 40 Nm enough for hills?
The short answer? Yes, it’s possible, but it will definitely require some effort on your part. Let’s take a closer look to see if a 40 Nm e-bike is right for you.
Written by: Hanna Stevens | March 24, 2026 | Reading time: 6 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
- 40 Nm is enough for gentle inclines, but not for steep climbs
- A mid-engine layout makes a big difference at the same torque
- For greater comfort and less effort, 60 Nm or more is recommended
What is Nm (Newton-meter)?
To understand whether 40 Nm is sufficient, we need to briefly revisit the technical basics. In Europe, regulations stipulate that an electric bike (with assistance up to 25 km/h) must not exceed a rated power of 250 watts. Since most e-bikes already reach this limit, the power rating in watts doesn’t really reflect how powerful the bike feels when accelerating.
That’s why manufacturers highlight torque, measured in Newton-meters (Nm). Torque corresponds to the motor’s rotational force. It indicates the motor’s pulling power. Simply put: the higher the Nm rating, the easier the bike accelerates and the easier it is to climb a hill or a bridge. While watts represent available energy, torque (Nm) corresponds to the actual power felt when climbing.
In practice: Can you climb a hill with 40 Nm?
It all depends on what you mean by "slope."
For gentle inclines, such as a ramp or a hill with a gradient of about 12%, a 40 Nm motor is usually sufficient. You’ll reach the top with no trouble, as long as you pedal a little.
On the other hand, as soon as the slopes get steeper or longer, a 40 Nm motor quickly reaches its limits. E-bikes with 25 to 40 Nm motors are primarily designed for urban use and flat terrain. In the mountains, you’ll really have to put in a lot of effort.
For example, one cyclist recounts climbing Mont Ventoux on a lightweight e-bike (16 kg) with only 35 Nm of torque. However, he notes that he was in excellent physical condition and that it required a great deal of personal effort. If you are less fit or heavier, it becomes significantly more difficult.
The key difference: mid-drive motor vs. in-hub motor
Before making your choice, be sure to check the type of motor. At 40 Nm, this is a key factor.
The motor in the hub
A 40 Nm motor located in the wheel (front or rear) generally cannot make full use of the bike’s gears. For serious climbs, this type of motor is insufficient. To climb comfortably without overloading the system, you should aim for 80 Nm or more with a hub motor.
The central engine
With a mid-drive motor, the situation is completely different. Power is transmitted through the crankset, allowing the motor to take advantage of the bike’s gears.
By using a low gear on an uphill climb, the motor operates more efficiently. As a result, even with 40 Nm of torque, it is possible to climb steep hills, though not without effort.
Motors are more efficient at high cadences and low gear ratios. This helps preserve the motor, the battery, and your joints.
Your weight and your expectations
Be honest about your usage.
If you’re on the heavier side (for example, 90–100 kg), it’s best to avoid motors with low torque. In this case, you should aim for at least 65 Nm with a mid-drive motor. The combined weight of the rider and the bike (often 25 kg) puts a lot of strain on the motor when climbing.
It’s also a matter of comfort:
- Want to arrive without breaking a sweat? → Choose a more powerful engine
- If you see cycling as a physical activity → 40 Nm may be enough
How many Nm do you actually need?
Here are a few points of reference:
- 25 to 40 Nm: ideal for city riding and flat terrain. Hills are manageable, but require more effort and use more battery power
- 40 to 55 Nm: perfect for hilly terrain and comfortable daily commutes
- 60 to 75 Nm: the right balance for long distances, steep hills, and headwinds
- 75 to 100+ Nm: for extreme conditions (mountain biking, MTB , fully loaded cargo bikes). Some motors, such as the Bosch Performance Line CX, deliver 85–100 Nm
Beware of the “more powerful = better” trap
Salespeople may try to steer you toward very powerful motors (85 Nm), but that isn't always necessary.
An engine that is too powerful can:
- to be rude in the city
- reduce battery life
More torque = higher energy consumption.
A motor with 40–50 Nm of torque often provides better range and a smoother ride for everyday use.
Conclusion
Is 40 Nm enough for hills? Yes, for gentle climbs, especially with a mid-drive motor and if you're willing to pedal actively.
However, if you live in a mountainous area or want to climb steep hills with ease, we strongly recommend choosing a mid-drive motor with 60 to 85 Nm of torque.
The result: greater comfort, less effort, and significantly easier climbs.
You can add custom HTML/CSS/JavaScript or Liquid code right here.
FAQ
Is 40 Nm sufficient for Belgium or the Netherlands?
Yes, for most cities and gentle terrain, especially with a mid-drive motor.
Is 40 Nm enough for a mountain vacation?
No, that will be difficult. Aim for at least 60–75 Nm.
Which is better: a 40 Nm mid-drive motor or a 60 Nm hub motor?
A 40 Nm mid-drive motor can often perform better on hills thanks to its gear ratios.
Does a more powerful motor consume more battery power?
Yes, higher torque results in higher fuel consumption.
Is 40 Nm suitable for heavier people?
Less than ideal. It is best to choose 60 Nm or more.