Why ebike Motor Noise Under Load


Ebike means high speed in minimum effort. An electric bike with a hub motor offers pedal assist. That means if you peddle hard, the bike will run at high speed. But this speedy ride turns into a horrible experience when the motor noise under load. Why won’t it be?

The noisy motor is a symptom of a faulty e-bike engine. That means the bike can stop running anytime. Moreover, it’s alarming to have an unpleasant accident. You may lose control of the bike gear. I hope you understand the situation.

Anyways, to avoid any unpleasant incident, you have to fix the problem. Before that, let’s know what the wrong happening inside the motor is. It’s necessary so that you can rectify the error and get a noise-free e-bike motor. Let’s check it out.

Why ebike motor noise under load

e bike motor

It happens mostly because of a misaligned derailleur, dirty motor parts, or friction between the rotor and stator. 

However, one or more problems can appear at a time. Let dig deep into it.

  1. Misaligned Derrailluers: Sometimes, the sound creates from outside of the motor. An ebike with geared hub motor is a suitable example for it. When the derailleur is not aligned correctly, chain skip/rub appears. Thus, the motor creates a creepy sound when you peddle hard. However, a too tight or too loose chain can also show the same outcome. So, the entire drivetrain can need to be fixed.
  1. Dirty Motor Parts: The rotor can’t move freely when the motor gets rusty or grimy inside. Thus, the friction increase among the motor parts creates noise while the ebike is under load. However, the part that gets most rusty is the opening of the rotor. So, a regular cleaning routine can help a lot in this case.
  1. Friction Between Parts: Another thing that happens most often is the friction between the motor parts. Inside a motor, there is a rotor and a stator around it. In a few cases, these parts get displaced and rub against each other. This phenomenon is called “clogging.” While clogging, there creates friction between the rotor and stator. In this way, the motor can make an unusual noise.

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How to take care of ebike motor

How to fix noisy ebike motor

I know this question will come. You must want to know what you should do to prevent noisy electric bike motor. But being honest, I can help a little in this case. As the motor comes in a compact pack in an e-bike, you can’t do much for it. Even after this, if you want to take care of your electric bike motor, do the following.

  1. Keep it dry: Most of the time, water penetrates inside the motor, and it gets rusty. Thus, it makes unwanted noise. So keep your electric bike from heavy water flow. Don’t use the pressure wash while cleaning the bike. Also, wipe the bike up immediately after a wash.
  1. Avoid lubrication:  You can think lubrication will help to keep the motor from rust. But in reality, it hampers the motor instead as dirt gets attracted by the lube. If you still want to lubricate, apply silicon-based grease in optimal quantity.

How to fix noisy ebike motor

Whenever the motor starts making noise, you should fix it immediately. It’s not just about the annoying sound. It’s about the performance and safety of your electric bike. However, follow these below tips to fix a noisy electric bike motor.

Tip-1: Fix the motor


Before checking the derailleur, fix the motor first. Otherwise, you will need to do it twice, which can be time-consuming. Anyways, go step by step to repair the motor.

  1. Disassemble: The very first step should be disassembling the motor. Turn off the bike and get a Screwdriver and start dismantling. Before that, you have to take the wheel off the bike. You can do it with an Adjustable Wrench. However, after taking the wheel off, remove the freewheel. Then, loosen the screws from the faceplate to open the motor.
  1. Clean and reset: You can do minor cleaning when the rotor is on the bike. Just take a toothbrush and rub it with alcohol. However, it’s good to take the rotor off the wheel for precise cleaning and resetting. So, push the axle nut to remove the rotor.

Now, remove the disc side plate and wash the plates with soap water. However, don’t wet the rotor. Instead, clean it with Bike Cleaner. After cleaning, reset all the components and go to the next step.

  1. Reinstallation: Lastly, reinstall the components. First of all, you have to close the motor. For that, place the faceplate correctly and then tighten all the screws. Now, reinstall the wheel. Set it on the bike and mount the freewheel. Then, insert all the bolts and washers, and you are all set.
Note: Disassemble, and installation process can vary from bike to bike. Follow your bike manufacturer manual to do it correctly.

Tip-2: Adjust the derailleur

There is nothing special in adjusting electric bike derailleur. You can do it usually you do for a typical road or mountain bike. Just a few things to remember here. For example, there is wiring through the freewheel. So, you have to make sure the cable doesn’t get damaged. Another thing is you have to remove the battery before doing the job. Otherwise, it can fall and get damaged.

Anyway, follow the below tips to adjust the derailleur.

  1. Firstly, turn the ebike off, remove the battery and hang it to a Bike Repair Stand.
  1. Secondly, diagnose the derailleur alignment. If the chain is straight and parallel to the cogs, then derailleur alignment is okay. Otherwise, it needs fine-tuning.
  1. Thirdly, for realigning the derailleur, you have to adjust the limit screw setting. Tighten or loosen the limit screw and use the barrel adjuster until you achieve the ideal alignment. For advanced troubleshooting, you can follow my Rear Derailleur Adjustment guide.

Frequently Asked Questions About E-bike Motor

How long does an electric bike motor last?

It depends on how frequently you ride the bike. A good quality motor lasts for a long. It can last at least 10,000 miles. But, if you take well care of it and maintain it right, it will last even more. However, it’s good to maintain the motor every month and replace it after two or three years.

How often should an electric bike be serviced?

It depends on where and how you ride. As it’s a bit tricky to maintain an e-bike, a professional’s hands can do it better. Moreover, it will save a lot of your time. So, if you are okay with spending some money, it’s good to give the e-bike twice a year to a bike shop for servicing.

How often should I clean my eBike chain?

You can clean your e-bike chain as you clean the other bike’s chain. There is nothing exceptional to consider while cleaning the electric bike chain. Just make sure the motor doesn’t get wet. Avoid hosepipe or pressure wash for the washing job. However, I am telling you if you don’t know how often the chain should be clean. It’s good to wipe the chain up after every ride. Then, get a proper chain wash every month.


Along with the battery, the motor is an essential part of an electric bike. When the motor is in bad condition, the bike won’t go very far. A noisy motor indicates that the motor is not well. So, you have to fix the motor. However, you must be clear about the problem before getting a solution. So, you should know why e-bike motor noise under load.

However, today’s post was all about e-bike motor maintenance. How to take care of it, how to fix everything is described precisely. I hope it will help.

Anyways, I hope you enjoy riding your electric bike.


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