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Motor & Speed

Ampler E-Bike Motor & Speed

Ampler e-bike motor

The motor is the heart of your Ampler e-bike. All Ampler e-bikes have a 48 V 250 W brushless DC rear hub motor. Brushless means that there are no brushes between the stator and the rotor. This makes the bike motor more efficient and durable, as there are no wearing parts. The motor is being developed by Ampler together with Aikema.

The motor has a nominal power output of 250 W and is limited to a maximum speed of 25 km/h. The peak power output of the motor is about 400 W, the maximum torque is 50 nm.

Ampler e-bike motor complies with all European regulations which means that Ampler e-bikes are fully street-legal in European Union

All Ampler e-bikes have a 48 V 250 W brushless DC rear hub motor with a maximum speed of 25 km/h. 

Why does Ampler have a hub drive motor instead of a mid- or front-drive motor?

All Ampler e-bikes have a hub drive motor. Placing the electric cycle motor in the rear wheel hub often results with a more balanced weight distribution of the bike. This gives a smoother acceleration and more natural feel to the ride

Compared to mid-drive motor, a hub motor:

  • Requires less maintenance than a mid-drive motor.
  • Hub motor doesn’t add any extra stress to the chain or shifters because it is not connected to the main pedal drive system. There are also no drivetrain losses because of that.
  • Small hub motors look sleek behind the cassette of the rear hub.
  • Having a motor separate from the pedals gives the bike smoother and quieter operation.
  • A hub motor in the rear has a better weight distribution while riding and picking the bike up to carry

Read more about e-bike motors and electronics here

What is a torque sensor on an electric bike?

Torque sensor measures the speed of your bike and how hard you are pedaling.

Your Ampler e-bike is equipped with a torque sensor. Therefore, the bike is easy to use and the motor power is controlled by your own pedalling force — the harder you pedal, the more power it gives to the motor. 

The torque sensor amplifies your every input in real time, making you feel like a superhuman. This guarantees a safe and smooth riding experience.

Why and how to calibrate the torque sensor on an e-bike?

Calibrating your electric bike’s torque sensor means that you re-adjust the sensor signals. This helps to improve your bike’s responsiveness and power to its original figures.

We recommend calibrating your bike’s torque sensor every 3–6 months, or in case the bike feels over- or underpowered. 

Torque sensor calibration is done via the Ampler mobile app using the following steps: 

  1. Adjust the left crank forward, parallel to the ground. 
  2. Connect the Ampler mobile app with your bike via Bluetooth 
  3. Open ‘Vehicle’ setting from the menu 
  4. Click on ‘torque sensor calibration’ 
  5. The Power button on your bike blinks orange 
  6. The Power button on your bike will turn green once the calibration is successfully finished. 

What’s the e-bike top speed?

In European Union, according to EN15194 standards, the pedal assist electric bike speed limit is 25 km/h, meaning that the motor supports the e-bike up to max speed of 25 km/h. 

The same goes for Ampler — all Ampler e-bikes top speed is limited to 25 km/h. From this pace onwards, you can shift gears to go faster and let your muscles do the work — without any resistance from the motor thanks to the integrated freewheel hub.

The actual max speed that you can get with your Ampler depends solely on your muscle strength. 

Can Ampler e-bikes charge themselves?

Ampler electric bikes do not have energy recovery/recuperation.

For e-bikes with recuperation, the braking energy generated is fed back into the system and used by the engine. However, the energy gained is only marginal. 

Another downpoint would be that no freewheel could be installed in the e-bike motor, so you would have to live with the resistance as soon as the motor does not support you. In addition, the motors of e-bikes with recuperation are more susceptible to damage and wear. 

In order for our motors to be small, lightweight, powerful and our bikes easy to pedal without support, we’ve decided not to use recuperation on Ampler electric bikes.

Is there any motor resistance on my e-bike?

The motor support slowly disengages as you approach 25 km/h to make an easier transition, and then disengages.
Once the motor is switched off, an Ampler e-bike feels like a classic bike. 

This also applies if the battery is empty or you do not switch on the e-bike.

Can I adjust the motor settings on my Ampler e-bike?

Yes, you can adjust the motor settings via the Ampler mobile app. This means adjusting the max speed and max power up to 25 km/h and 250W.

Read more on how to adjust e-bike motor settings using the app

Motor & Speed

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