Written By Doug Smirnoff

Aostirmotor M20 Common Problems and Troubleshooting

If you own an Aostirmotor M20 Electric Bike, you may encounter common problems during your rides. In this guide, we’ll address these issues and provide troubleshooting solutions specific to the Aostirmotor M20 model. Whether you’re experiencing performance issues or design-related concerns, we’ve got you covered.

Riding your Aostirmotor M20 should be a breeze, but occasional hiccups can occur. Let’s explore how to tackle them effectively.

Aostirmotor M20 Overview

The Aostirmotor M20 Electric Bike is a versatile and efficient mode of transportation. It boasts a powerful 350W motor and a 36V 7.5Ah battery, delivering a top speed of 18 mph and a maximum range of 22 miles.

Product Details Features
Motor Power 350W
Battery Voltage 36V 7.5Ah

The Aostirmotor M20 features small wheels, a step-through and folding frame, and a retractable seat post, making it incredibly convenient and adaptable to your needs. Its sleek and modern design adds a contemporary and innovative touch to this exceptional e-bike.

Equipped with aluminum alloy rims, a high-magnification brushless motor, a single-speed gear, an integrated hidden battery, and all the equipment of regular bikes, this e-bike offers efficiency, simplicity, and innovation for your urban rides.


Thanks to the duo of motor and battery providing 350W of power and 36V 7.5Ah, this bike will deliver on your commute or longer adventures of the week-end. Enjoy 18 mph of top speed and a max range of 22 miles.


The small wheels, step through and folding frame, and retractable seat post will shrink your bike to a small convenient size when needed and assure to fit your height and riding style when unfolded and ready to go. The sleek and modern lines are offering a contemporary and innovative look to this special e-bike.

Great Features

Equipped with aluminum alloy rims, a high-magnification brushless motor, a single-speed gear, an integrated, hidden battery, and all the equipment of regular bikes, this will be an efficient, simplistic but innovative bike for all your urban jungle rides.

Causes of Common Problems with the Aostirmotor M20

Before we dive into troubleshooting, let’s briefly introduce the common problems you may encounter while using the Aostirmotor M20 Electric Bike. The following subsections will address these issues and provide solutions:

Common Problems with the Aostirmotor M20 and Troubleshooting

1. Battery Not Charging

Description: Your Aostirmotor M20’s battery is not charging, and you’re unable to power up the bike.

Cause: This issue can occur due to a faulty charger, a loose connection, or a malfunctioning battery.


  1. Ensure the charger is properly connected to both the wall outlet and the bike’s charging port.
  2. Inspect the charging cable for any visible damage, and replace it if necessary.
  3. If the battery is still not charging, contact Aostirmotor customer support for further assistance or to check for a potential battery issue.

2. Motor Stopped Working

Description: The electric motor on your Aostirmotor M20 has suddenly stopped working, and the bike is not providing any assistance.

Cause: Motor failure can result from overheating, electrical issues, or a damaged motor unit.


  1. Allow the motor to cool down if it has overheated. Avoid pushing the motor to its limits for extended periods.
  2. Check the motor’s electrical connections for loose wires or connections and secure them if necessary.
  3. If the motor continues to be non-functional, contact Aostirmotor’s technical support for a motor assessment and potential replacement.

3. Inconsistent Power Assistance

Description: Your Aostirmotor M20 provides inconsistent power assistance, with varying levels of support while riding.

Cause: This issue may arise from sensor misalignment, battery fluctuations, or a malfunctioning controller.


  1. Inspect the sensor alignment on the bike. Ensure they are properly positioned and free from debris or obstructions.
  2. Check the battery’s charge level, and charge it fully if needed. Inconsistent power can occur when the battery is low.
  3. If the problem persists, contact Aostirmotor’s technical support to diagnose and address any controller or sensor-related issues.

4. Brake Issues

Description: You’re experiencing problems with the brakes on your Aostirmotor M20, such as reduced braking efficiency or squeaking noises.

Cause: Brake issues can be caused by brake pad wear, contaminated brake surfaces, or misadjusted brake components.


  1. Inspect the brake pads for wear and replace them if they are significantly worn down.
  2. Clean the brake surfaces to remove any contaminants, such as oil or debris, that may affect braking performance.
  3. If the brakes continue to exhibit problems, consider having them professionally inspected and adjusted by a bike mechanic.

5. Display Malfunction

Description: The display unit on your Aostirmotor M20 is not functioning correctly, displaying incorrect information or not turning on.

Cause: Display issues can be caused by loose connections, water damage, or a faulty display unit.


  1. Check the connections between the display unit and the bike’s electrical system, ensuring they are securely connected.
  2. Ensure the display unit is not exposed to water or moisture, as this can damage the electronics. Keep it dry at all times.
  3. If the display problem persists, contact Aostirmotor’s customer support for assistance or to arrange for a display unit replacement.

6. Tire Punctures

Description: You’ve encountered frequent tire punctures while riding your Aostirmotor M20.

Cause: Punctures can occur due to sharp objects on the road, underinflated tires, or worn-out tire tubes.


  1. Inspect your tires regularly for any embedded debris and remove it to prevent future punctures.
  2. Maintain the recommended tire pressure to reduce the risk of pinch flats and punctures.
  3. If punctures persist, consider upgrading to puncture-resistant tires or carrying a tire repair kit for on-the-go fixes.

7. Sudden Loss of Power

Description: Your Aostirmotor M20 experiences sudden power loss during your rides, leaving you stranded.

Cause: This issue can be caused by loose battery connections, a drained battery, or overheating of electrical components.


  1. Check and secure all battery connections to ensure they are tightly connected.
  2. Monitor your battery’s charge level during rides and recharge it when it approaches a low charge to avoid sudden power loss.
  3. If overheating is suspected, allow the bike to cool down before resuming your ride.

8. Gear Shifting Problems

Description: You’re experiencing difficulty in shifting gears on your Aostirmotor M20, or the gears are slipping unexpectedly.

Cause: Gear issues can result from cable tension problems, misaligned derailleurs, or worn-out gear components.


  1. Inspect the gear cables for proper tension and adjust them if needed to ensure smooth shifting.
  2. Check the alignment of the front and rear derailleurs to ensure they are properly synchronized with the gear changes.
  3. If gear slipping continues, consult a bike mechanic to assess and potentially replace worn-out gear components.

9. Unusual Noises

Description: Your Aostirmotor M20 emits unusual noises, such as rattling, creaking, or clicking, while riding.

Cause: Unusual noises can result from loose components, worn-out bearings, or debris trapped in the bike’s moving parts.


  1. Inspect your bike for loose bolts and components, tightening them to eliminate rattling noises.
  2. Check the bearings in the wheels, bottom bracket, and headset for wear and replace them if necessary.
  3. Examine the bike’s moving parts for trapped debris and clean or remove it to stop clicking or creaking sounds.

10. Electrical Display Errors

Description: The electrical display on your Aostirmotor M20 is showing error codes or malfunctioning, affecting your ride information.

Cause: Display errors can occur due to software glitches, loose connections, or damaged display units.


  1. Attempt a system reset as per the manufacturer’s instructions to address potential software glitches.
  2. Check and secure all display unit connections to ensure they are properly seated.
  3. If the display issues persist, contact Aostirmotor’s technical support for further diagnosis or display unit replacement.

11. Frequent Chain Slippage

Description: You notice that the chain on your Aostirmotor M20 frequently slips off the gears while riding.

Cause: Chain slippage can occur due to improper tension, a misaligned chain, or worn-out chain components.


  1. Ensure that the chain tension is adjusted correctly according to the manufacturer’s recommendations.
  2. Check for any misalignment of the chain on the front and rear gears and adjust as needed.
  3. If the chain continues to slip, inspect the chain for wear and replace it if necessary.

12. Unresponsive Electric Assist

Description: The electric assist on your Aostirmotor M20 is unresponsive, and the bike does not provide any motor-assisted power.

Cause: Unresponsiveness can result from a malfunctioning controller, a dead battery, or electrical issues.


  1. Check the battery charge level and recharge it if it is completely drained.
  2. Inspect the controller connections and ensure they are secure and free from corrosion or damage.
  3. If the electric assist remains unresponsive, contact Aostirmotor’s technical support for further diagnosis and potential controller replacement.

13. Uneven Braking

Description: Your Aostirmotor M20 exhibits uneven braking, with one brake lever requiring significantly more force than the other.

Cause: Uneven braking can result from misadjusted brake calipers, worn brake pads, or uneven cable tension.


  1. Inspect the brake calipers and ensure they are centered and aligned properly with the brake discs.
  2. Check the brake pads for wear and replace them if one side is significantly more worn than the other.
  3. Adjust the brake cable tension to ensure both brake levers require a similar amount of force for braking.

14. Erratic Pedal Assist

Description: The pedal assist on your Aostirmotor M20 behaves erratically, providing inconsistent assistance levels while pedaling.

Cause: Erratic pedal assist can occur due to sensor malfunctions, loose wiring, or interference from other electronic devices.


  1. Inspect the pedal assist sensors and ensure they are clean, properly positioned, and free from damage.
  2. Check for loose or damaged wiring connections related to the pedal assist system and secure or repair them as needed.
  3. Avoid riding near strong electromagnetic interference sources, as they can disrupt the pedal assist signal.

15. Unstable Folding Mechanism

Description: The folding mechanism on your Aostirmotor M20 is unstable and does not securely hold the bike in its folded position.

Cause: Unstable folding can result from loose locking mechanisms, worn hinge components, or misalignment.


  1. Inspect the folding mechanism for loose bolts or locking pins and tighten them to ensure a secure fold.
  2. Check the hinge components for signs of wear and replace any worn parts to improve stability.
  3. Ensure proper alignment of the folding mechanism to prevent wobbling while folded.

16. Loose Handlebars

Description: The handlebars on your Aostirmotor M20 feel loose or wobbly while riding, affecting your control.

Cause: Loose handlebars can result from improper assembly, loose stem bolts, or worn-out handlebar grips.


  1. Inspect the stem bolts connecting the handlebars to the stem and tighten them to the recommended torque specifications.
  2. Check the handlebar grips for wear or damage and replace them if necessary to improve grip and control.
  3. If the issue persists, consider having a bike mechanic assess the handlebar assembly for proper alignment.

17. Pedal Issues

Description: You’re experiencing problems with the pedals on your Aostirmotor M20, such as pedal slippage or pedal breakage.

Cause: Pedal issues can result from loose pedal threads, worn-out bearings, or impact damage.


  1. Ensure the pedals are securely threaded into the crank arms and tighten them to prevent pedal slippage.
  2. Check the pedal bearings for wear and replace them if there is excessive play or grinding noises.
  3. If a pedal is broken or damaged, replace it with a suitable replacement pedal for safe riding.

18. Seat Comfort Issues

Description: You find the seat on your Aostirmotor M20 uncomfortable, leading to discomfort or pain during longer rides.

Cause: Seat discomfort can result from improper seat adjustment, saddle shape, or personal preference.


  1. Adjust the seat height and angle to find a comfortable riding position that suits your body and riding style.
  2. If the saddle shape does not provide adequate comfort, consider upgrading to a saddle with a design that suits your needs.
  3. Consider wearing padded cycling shorts or using a seat cushion for added comfort during longer rides.

19. Brake Squealing

Description: The brakes on your Aostirmotor M20 produce loud squealing noises when applied, which can be annoying and distracting.

Cause: Brake squealing can result from contaminated brake pads, glazed brake surfaces, or misaligned calipers.


  1. Inspect the brake pads for contamination or glazing and clean or replace them as needed for quieter braking.
  2. Sand or roughen the brake surfaces slightly to remove glazing and improve brake performance.
  3. Check the alignment of the brake calipers and adjust them to ensure proper contact with the brake discs.

20. Unresponsive Throttle

Description: The throttle on your Aostirmotor M20 is unresponsive, and you’re unable to control the motor-assisted power.

Cause: Throttle issues can result from damaged throttle cables, loose connections, or a malfunctioning throttle unit.


  1. Inspect the throttle cables for damage or wear and replace them if necessary to restore responsiveness.
  2. Check the connections between the throttle unit and the electrical system to ensure they are secure and undamaged.
  3. If the throttle remains unresponsive, contact Aostirmotor’s technical support for further diagnosis and potential throttle unit replacement.

21. Unstable Kickstand

Description: The kickstand on your Aostirmotor M20 is unstable and does not provide reliable support when parked.

Cause: An unstable kickstand can result from loose bolts, a misaligned stand, or a worn-out kickstand mechanism.


  1. Inspect the kickstand bolts and tighten them securely to the bike frame to ensure stability.
  2. Check the alignment of the kickstand and make adjustments to ensure it provides proper support when deployed.
  3. If the kickstand is damaged or worn, consider replacing it with a new, reliable stand.

22. Headlight Malfunction

Description: The headlight on your Aostirmotor M20 is not functioning correctly, reducing visibility during nighttime rides.

Cause: Headlight issues can result from loose wiring, a burnt-out bulb, or a faulty headlight switch.


  1. Inspect the wiring connections for the headlight and ensure they are secure and free from damage.
  2. If the headlight bulb is burnt out, replace it with a compatible bulb to restore illumination.
  3. If the headlight switch is suspected to be faulty, consult the manufacturer’s guidance for replacement or repair.

23. Unusual Vibrations

Description: Your Aostirmotor M20 exhibits unusual vibrations or wobbling sensations while riding, affecting stability.

Cause: Unusual vibrations can result from improperly balanced wheels, loose spokes, or a damaged tire.


  1. Check the wheel balance and ensure both wheels are properly trued to minimize vibrations.
  2. Inspect the spokes for proper tension and tighten or replace any loose or damaged spokes as needed.
  3. Examine the tires for any visible damage or irregularities and replace them if necessary to improve ride stability.

24. Charging Port Issues

Description: You encounter problems with the charging port on your Aostirmotor M20, making it difficult to charge the battery.

Cause: Charging port issues can result from dirt or debris in the port, loose connections, or a damaged charging port.


  1. Carefully clean the charging port to remove any dirt or debris that may obstruct the connection with the charger.
  2. Check the connections inside the charging port for any loose or damaged components and secure or repair them as necessary.
  3. If the charging port remains problematic, consult Aostirmotor’s technical support for guidance on potential repairs or replacements.

25. Unresponsive Brakes

Description: The brakes on your Aostirmotor M20 are unresponsive or require excessive force to engage, compromising safety.

Cause: Unresponsive brakes can result from brake fluid leaks, air in the brake lines, or worn-out brake components.


  1. Inspect the brake lines and calipers for any signs of brake fluid leaks and address them promptly to restore brake responsiveness.
  2. Bleed the brake lines to remove air bubbles, which can improve brake performance and responsiveness.
  3. If the brake components are significantly worn, replace them with new brake pads or other necessary parts for safe braking.

Aostirmotor M20 Electric Bike User Reviews

Positive Reviews from Aostirmotor M20 Electric Bike Users

While researching user feedback for the Aostirmotor M20 Electric Bike on the Internet, we found that some users were satisfied with the following aspects of their experience:

  • Performance: Many users praised the bike’s performance, highlighting its impressive 350W motor and 36V 7.5Ah battery, which delivered a top speed of 18 mph and a maximum range of 22 miles. They appreciated the bike’s ability to handle commutes and weekend adventures effectively.
  • Design: Several users mentioned the bike’s convenient folding frame and retractable seat post, which made it easy to store and adjust to their height and riding style. The sleek and modern design of the Aostirmotor M20 also received positive comments for its contemporary appearance.
  • Great Features: Users appreciated the bike’s features, including aluminum alloy rims, a high-magnification brushless motor, and an integrated hidden battery. The simplicity and innovation of the bike were commended for urban riding.

Overall, positive feedback from Aostirmotor M20 Electric Bike users suggests that the bike offers a satisfying combination of performance, design, and features for urban and recreational riding.

Negative User Reviews of the Aostirmotor M20 Electric Bike

After reviewing negative user feedback on the Internet regarding the Aostirmotor M20 Electric Bike, it’s apparent that some users were not satisfied with the following issues:

  • Battery Life: Several users expressed concerns about the bike’s battery life, reporting that it did not meet their expectations for longer rides. Some mentioned that the range was limited, especially when using the bike at its maximum speed.
  • Build Quality: A few users reported issues with the bike’s build quality, citing concerns about components such as the brakes, pedals, and handlebars. Some mentioned that these parts felt less durable than expected.
  • Assembly Difficulty: Some users found the assembly process to be challenging and time-consuming. They mentioned difficulties in following the assembly instructions and felt that it required more effort than anticipated.

Negative feedback from Aostirmotor M20 Electric Bike users primarily revolves around battery life, build quality, and assembly difficulties. It’s important to note that user experiences can vary based on individual preferences and expectations.

Based on the user reviews available on the Internet, the majority of Aostirmotor M20 Electric Bike users appear to be satisfied with their purchase. While there are concerns and negative feedback, the bike’s positive attributes, including its performance and design, seem to outweigh the issues mentioned by a subset of users. As with any product, individual experiences may vary, and it’s advisable to consider both positive and negative feedback when making a decision.

Aostirmotor M20 Electric Bike Manual

The operating instructions and user manual for the Aostirmotor M20 Electric Bike can be found on the manufacturer’s website. For comprehensive guidance on how to operate, maintain, and troubleshoot your bike, please visit the manufacturer’s official website and navigate to the product’s support or resources section.

Aostirmotor M20 Frequently Asked Questions

1. How can I extend the battery life of my Aostirmotor M20 Electric Bike?

To maximize your bike’s battery life, avoid consistently riding at top speeds and using full throttle. Opt for lower power modes when possible and charge the battery before it gets completely depleted to help prolong its lifespan.

2. What should I do if my Aostirmotor M20 displays an error code on the electrical display?

If you encounter an error code on the display, consult the user manual for your bike, or visit the manufacturer’s website for a list of error codes and their corresponding troubleshooting steps. In some cases, it may require professional assistance.

3. Can I use my Aostirmotor M20 in wet or rainy conditions?

The Aostirmotor M20 is designed to be water-resistant, but it is not recommended for use in heavy rain or submersion in water. Riding in light rain should generally be fine, but it’s crucial to dry and maintain the bike after wet rides to prevent water-related issues.

4. How often should I perform maintenance on my Aostirmotor M20 Electric Bike?

Regular maintenance is essential to keep your bike in good condition. It’s advisable to perform basic checks such as tire pressure, brake inspection, and lubrication every few weeks. Additionally, a more thorough maintenance check should be done at least once a year or as specified in the user manual.

5. What do I do if I experience sudden power loss while riding my Aostirmotor M20?

If you encounter sudden power loss, check the battery connections for secure attachment. Ensure that the battery is adequately charged before your ride. If the issue persists, contact the manufacturer’s customer service or a local service center for assistance.


In case you encounter any problems or issues with your Aostirmotor M20 Electric Bike, always refer to the user manual for guidance on troubleshooting and maintenance. Additionally, don’t hesitate to reach out to the manufacturer’s customer service or visit a certified service center whenever necessary. They can provide expert assistance to ensure your bike continues to perform optimally and safely.

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