Written By Doug Smirnoff

Addmotor HEROTAN M-65X Common Problems and Troubleshooting

Discovering and resolving common problems with your Addmotor HEROTAN M-65X electric bike is essential for maintaining a smooth riding experience. In this article, we’ll address various issues that you might encounter with this specific model. Whether you’re a proud owner of the HEROTAN M-65X or considering purchasing one, understanding these common problems and their solutions will be invaluable.

Addmotor HEROTAN M-65X Overview

Combining a 1970’s retro outstanding look with a classic color contrast design, the Addmotor HEROTAN M-65X is the most popular electric bike on the market. It offers a strong, solid, and convenient riding experience that lives up to your expectations.

The key product details and features of the Addmotor HEROTAN M-65X are as follows:

Motor Bafang 48V*750W Rear Brushless Gear Motor
Battery Samsung 20AH (21700-5000mah), 8-10 Hours Fully Charged Time, Rated For 1000-1500 Cycles
Display Addmotor EB 2.0 Multiple Function LCD Display (Increase to 7 PAS)

With a 5-in-1 unique patented taillight, Addmotor ensures that you are visible to others in the dark while letting them know your intentions. The EB 2.0 headlight provides a 360° side view for added safety. This fat tire cruiser ebike features one of Addmotor’s most recognizable silhouettes and a comfortable 2Up seat, making it the perfect blend of performance and style.

Causes of Common Problems with the Addmotor HEROTAN M-65X

Dive into the heart of the Addmotor HEROTAN M-65X electric bike experience by understanding the root causes behind its common problems. In this section, we unravel the mysteries behind issues riders may encounter, shedding light on the reasons behind glitches and malfunctions. Gain insights into the causes and empower yourself with the knowledge needed to troubleshoot effectively and keep your Addmotor HEROTAN M-65X running smoothly.

Common Problems and Troubleshooting for Addmotor HEROTAN M-65X

1. Battery Not Holding Charge

Description: The Addmotor HEROTAN M-65X battery does not hold a charge as long as expected, leading to reduced riding range.

Cause: Over time, lithium-ion batteries may degrade or lose capacity due to repeated charge and discharge cycles.


  1. Ensure the charger is securely connected to the bike and the power source.
  2. Check for loose battery connections; if found, reconnect them securely.
  3. If the battery continues to have issues, consider replacing it with a compatible one.

2. Motor Not Responding

Description: The motor on your Addmotor HEROTAN M-65X is not responding when you engage the throttle.

Cause: This issue may be caused by a faulty motor controller or throttle connection.


  1. Inspect the throttle cable and connections for damage or loose connections.
  2. If the connections are intact, test the throttle using a multimeter to ensure it’s functioning correctly.
  3. If the throttle is working, the motor controller may be the problem and should be examined and possibly replaced.

3. LCD Display Malfunction

Description: The LCD display on your Addmotor HEROTAN M-65X is not showing accurate information or is not functioning.

Cause: A malfunctioning display can result from wiring issues or a defective display unit.


  1. Check the wiring connections to the display and ensure they are secure and undamaged.
  2. If the wiring is not the issue, the display unit itself may need to be replaced.
  3. Consider performing a factory reset on the display if that option is available.

4. Brakes Squeaking

Description: The brakes on your Addmotor HEROTAN M-65X produce a high-pitched squeaking noise when applied.

Cause: Squeaky brakes are often caused by brake pad contamination or wear.


  1. Inspect the brake pads for contamination or excessive wear; replace them if necessary.
  2. Clean the brake rotors and pads with isopropyl alcohol to remove any contaminants.
  3. If the problem persists, consider adjusting the brake caliper alignment.

5. Taillight Not Functioning

Description: The taillight on your Addmotor HEROTAN M-65X is not functioning correctly, affecting nighttime visibility.

Cause: This issue may be due to loose wiring connections or a faulty taillight unit.


  1. Inspect the wiring connections to the taillight and ensure they are securely connected.
  2. If the connections are fine, consider replacing the taillight unit with a compatible one.
  3. Ensure the taillight settings on the LCD display are configured correctly.

6. Loss of Pedal Assist Functionality

Description: The pedal assist feature on your Addmotor HEROTAN M-65X has stopped working, making it difficult to ride with assistance.

Cause: Pedal assist issues can be caused by sensor malfunctions or wiring problems.


  1. Check the pedal assist sensor and magnet alignment; adjust or replace them if necessary.
  2. Inspect the wiring harness for damage or loose connections; repair or replace as needed.
  3. Ensure the pedal assist settings on the LCD display are configured correctly.

7. Unusual Motor Noise

Description: Your Addmotor HEROTAN M-65X’s motor is producing unusual noises during operation, which may indicate a problem.

Cause: Unusual motor noises can result from loose components or internal motor issues.


  1. Inspect the motor mounts and fasteners for tightness; tighten them if needed.
  2. If the noise persists, consider consulting a professional for a more in-depth motor inspection.
  3. Regularly clean and lubricate the chain and drivetrain to prevent excessive noise.

8. Inaccurate Range Estimation

Description: The estimated range displayed on your Addmotor HEROTAN M-65X does not align with the actual riding range experienced.

Cause: Inaccurate range estimation can be influenced by various factors, including terrain and riding conditions.


  1. Consider recalibrating the range estimation feature by fully charging the battery and performing a complete ride cycle.
  2. Take into account external factors such as wind, temperature, and terrain when assessing range expectations.
  3. Regularly maintain and service your electric bike to optimize battery performance.

9. Display Backlight Not Working

Description: The backlight on your Addmotor HEROTAN M-65X’s LCD display is not functioning, making it difficult to read information in low-light conditions.

Cause: This issue may be due to a faulty display unit or a loose backlight connection.


  1. Inspect the backlight connections; if they are loose, secure them properly.
  2. If the backlight still doesn’t work, consider replacing the LCD display unit.
  3. Adjust your riding schedule to avoid low-light conditions until the issue is resolved.

10. Brake Lever Sensitivity

Description: The brake levers on your Addmotor HEROTAN M-65X are overly sensitive, causing sudden and abrupt stops.

Cause: Sensitivity issues may arise from improper brake lever adjustment or hydraulic brake system problems.


  1. Adjust the brake lever reach and sensitivity to match your riding preferences and comfort level.
  2. If the issue persists, inspect the brake hydraulic system for any leaks or air bubbles; bleed the brakes if needed.
  3. Practice gradual braking to minimize abrupt stops and enhance riding safety.

11. Chain Slippage

Description: The chain on your Addmotor HEROTAN M-65X occasionally slips off the sprockets, causing disruptions in your ride.

Cause: Chain slippage can occur due to loose chain tension, worn sprockets, or a misaligned derailleur.


  1. Inspect the chain tension and adjust it as per the manufacturer’s guidelines.
  2. Check the sprockets for wear and replace them if necessary.
  3. Ensure the derailleur is properly aligned and indexed to prevent chain misalignment.

12. Front Wheel Alignment

Description: Your Addmotor HEROTAN M-65X’s front wheel seems misaligned, affecting the bike’s stability and handling.

Cause: Front wheel misalignment can occur from a loose axle, improper installation, or suspension issues.


  1. Check the front wheel axle for tightness and tighten if needed.
  2. Verify that the front wheel is correctly installed, ensuring it sits securely in the fork dropouts.
  3. If the problem persists, inspect the bike’s suspension components for any damage or misalignment.

13. Uneven Tire Wear

Description: Your Addmotor HEROTAN M-65X’s tires exhibit uneven wear patterns, affecting ride comfort and handling.

Cause: Uneven tire wear can result from improper tire pressure, misalignment, or road conditions.


  1. Regularly check and maintain the tire pressure within the recommended range specified by the manufacturer.
  2. Inspect the wheel alignment to ensure it’s within acceptable tolerances.
  3. Adjust your riding style to avoid rough terrain or sharp turns that may contribute to uneven tire wear.

14. Loose Handlebars

Description: The handlebars on your Addmotor HEROTAN M-65X are loose or wobbly, impacting control and safety.

Cause: Loose handlebars may result from improperly tightened stem bolts or worn components.


  1. Check and tighten the stem bolts following the manufacturer’s torque specifications.
  2. Inspect the handlebar grips and components for wear; replace them if necessary.
  3. Regularly perform a safety check on your bike’s handlebar system to prevent issues.

15. Spokes Breakage

Description: Spokes on your Addmotor HEROTAN M-65X’s wheels are breaking, potentially causing wheel imbalance.

Cause: Spokes can break due to excessive tension, impacts, or fatigue over time.


  1. Inspect all spokes for damage and replace any broken ones promptly.
  2. Regularly check and adjust spoke tension to ensure they are within the recommended range.
  3. Avoid rough terrain or heavy impacts that may lead to spoke breakage.

16. Erratic Power Delivery

Description: Your Addmotor HEROTAN M-65X experiences erratic power delivery, causing sudden surges or drops in speed.

Cause: This issue may be related to throttle or controller problems, including loose connections or wiring faults.


  1. Inspect the throttle and controller connections for any loose wires or damaged components; reseat or replace as needed.
  2. Check for any loose connectors or pins in the wiring harness and secure them properly.
  3. If the problem persists, consult a professional technician to diagnose and repair the controller or throttle issues.

17. Excessive Vibration

Description: Your Addmotor HEROTAN M-65X produces excessive vibrations during rides, leading to discomfort and potential component wear.

Cause: Excessive vibration can result from misaligned wheels, loose components, or imbalanced tires.


  1. Inspect the wheel alignment and ensure both wheels are properly seated in the frame dropouts.
  2. Tighten all bolts and fasteners, including those on the handlebars, stem, and saddle, to reduce potential sources of vibration.
  3. Check the tires for signs of imbalance or irregular wear; replace or balance them if necessary.

18. Display Error Codes

Description: The LCD display on your Addmotor HEROTAN M-65X shows error codes, indicating a malfunction in the electric bike’s systems.

Cause: Error codes can be triggered by sensor faults, electrical issues, or component malfunctions.


  1. Refer to the user manual or manufacturer’s documentation to identify the specific error code and its corresponding meaning.
  2. Perform a power cycle by turning the bike off and on to reset the system; if the error persists, contact customer support for guidance.
  3. If you have technical knowledge, inspect and test the affected components, such as sensors and wiring, for potential faults.

19. Chain Skipping Gears

Description: The chain on your Addmotor HEROTAN M-65X intermittently skips gears while shifting, leading to an unreliable gear change experience.

Cause: Chain skipping can be caused by cable tension issues, derailleur misalignment, or worn drivetrain components.


  1. Inspect and adjust the cable tension for precise shifting; ensure the cables are properly seated in their housings.
  2. Check the derailleur alignment and hanger; make necessary adjustments or replacements if misalignment is detected.
  3. If the issue persists, examine the condition of the cassette, chainring, and chain for wear, and replace them if needed.

20. Unresponsive PAS System

Description: The Pedal Assist System (PAS) on your Addmotor HEROTAN M-65X becomes unresponsive or fails to provide the expected assistance.

Cause: PAS issues can arise from sensor malfunctions, wiring faults, or software glitches.


  1. Inspect the PAS sensor and magnet alignment on the crankset; adjust or replace them if necessary.
  2. Check the wiring connections for the PAS system; reseat or repair any damaged wires or connectors.
  3. If the problem persists, consider updating or reprogramming the PAS system through the LCD display settings.

21. Brakes Not Engaging Smoothly

Description: The brakes on your Addmotor HEROTAN M-65X do not engage smoothly, leading to sudden or jerky stops.

Cause: Uneven brake pad wear, contamination, or air in the brake lines can result in this issue.


  1. Inspect the brake pads for wear and contamination; replace or clean them if necessary.
  2. Bleed the brake lines to remove any trapped air bubbles, ensuring a consistent brake feel.
  3. Check the brake caliper alignment and adjust it to ensure even pad contact with the rotor.

22. Loose Suspension Components

Description: Your Addmotor HEROTAN M-65X’s suspension components feel loose or exhibit excessive play, affecting ride comfort and stability.

Cause: Loose suspension components may result from insufficient preload or damaged suspension parts.


  1. Adjust the preload settings on your suspension fork or rear shock to achieve the desired stiffness and responsiveness.
  2. Inspect the suspension components for any visible damage, worn bushings, or loose fasteners; repair or replace as needed.
  3. Maintain proper suspension lubrication and servicing as recommended by the manufacturer.

23. Unresponsive Throttle

Description: The throttle on your Addmotor HEROTAN M-65X is unresponsive, and the bike doesn’t accelerate as expected.

Cause: Throttle issues may be related to wiring faults, throttle grip damage, or controller malfunctions.


  1. Inspect the throttle wiring and connectors for any loose or damaged wires; repair or replace as necessary.
  2. Examine the throttle grip for signs of wear, damage, or sticking; replace it if required.
  3. If the problem persists, consult a professional technician to diagnose and repair any controller-related issues.

24. Frequent Flat Tires

Description: Your Addmotor HEROTAN M-65X experiences frequent flat tires, causing inconvenience and ride interruptions.

Cause: Frequent flat tires can be caused by punctures, improper tire pressure, or inadequate tire protection.


  1. Inspect the tires for foreign objects, such as glass, nails, or sharp debris; remove them and patch any punctures.
  2. Maintain proper tire pressure within the manufacturer’s recommended range to reduce the risk of pinch flats.
  3. Consider using puncture-resistant tire liners or tubeless tire setups for added protection against flats.

25. Rust and Corrosion

Description: Your Addmotor HEROTAN M-65X exhibits signs of rust and corrosion on various components, affecting both aesthetics and performance.

Cause: Rust and corrosion can result from exposure to moisture, salt, or environmental conditions.


  1. Regularly clean and dry your bike after wet or salty rides to prevent rust formation.
  2. Apply a protective layer of bicycle-specific lubricants or rust inhibitors to vulnerable components, such as the chain and bolts.
  3. Inspect the frame and components for signs of rust and address them promptly with appropriate rust removal and prevention methods.

Addmotor HEROTAN M-65X Electric Bike User Reviews

When considering purchasing an electric bike like the Addmotor HEROTAN M-65X, it’s essential to hear from those who have already experienced it. We’ve compiled user reviews from various sources, with a focus on positive and negative feedback from actual customers who shared their experiences with this electric bike. All the information presented here is sourced from user reviews on the Internet.

Positive Reviews from Addmotor HEROTAN M-65X Electric Bike Users

  • Many users were satisfied with the long battery life, allowing them to enjoy extended rides without frequent recharging.
  • Some riders praised the powerful Bafang motor, providing ample assistance even on challenging terrains.
  • Several users appreciated the comfortable 2Up seat, making long rides more enjoyable.
  • Positive comments were also made about the unique taillight design, improving visibility and safety during nighttime rides.
  • Users highlighted the ease of assembly and customization options, allowing them to tailor the bike to their preferences.

Overall, the majority of users expressed satisfaction with the Addmotor HEROTAN M-65X Electric Bike, citing its performance, comfort, and customization options as key highlights.

Negative User Reviews of the Addmotor HEROTAN M-65X Electric Bike

  • Some users reported issues with the bike’s electronic components, such as the LCD display or throttle, malfunctioning or becoming unresponsive.
  • A few riders mentioned problems with the brakes, including squeaking noises and occasional lack of responsiveness.
  • Several users experienced difficulties with punctured tires and suggested the need for more durable tires or better puncture protection.
  • A minority of customers expressed frustration with the weight of the bike, finding it challenging to handle in certain situations.
  • Some riders noted that the bike’s range estimation was not always accurate, leading to unexpected battery depletion on longer rides.

While there were some negative experiences reported, it’s important to note that these issues may vary from user to user and may not represent the overall performance of the Addmotor HEROTAN M-65X Electric Bike.

Addmotor HEROTAN M-65X Electric Bike Manual

The operating instructions and user manual for the Addmotor HEROTAN M-65X electric bike can be found on the manufacturer’s website. For comprehensive guidance on how to operate and maintain your electric bike, please visit the official Addmotor website and locate the user manual section.

Addmotor HEROTAN M-65X Frequently Asked Questions

1. How do I charge the battery of the Addmotor HEROTAN M-65X electric bike?

To charge the battery, simply connect the provided charger to the charging port on the bike’s battery. Ensure that the charger is plugged into a compatible power outlet, and follow the charging instructions provided in the user manual.

2. What is the estimated range of the Addmotor HEROTAN M-65X on a single charge?

The estimated range per charge may vary depending on several factors, including terrain, rider weight, and pedal assist level. However, the manufacturer estimates a range of up to 105 miles per charge with PAS 1. Actual range may differ under different riding conditions.

3. How can I adjust the pedal assist settings on my HEROTAN M-65X electric bike?

You can adjust the pedal assist settings through the bike’s LCD display. Navigate to the settings menu and select the desired pedal assist level. Refer to the user manual for detailed instructions on adjusting and customizing your pedal assist preferences.

4. What should I do if I encounter a technical issue or a problem with my HEROTAN M-65X?

If you experience technical issues or problems with your electric bike, it’s advisable to consult the user manual for troubleshooting guidance. Additionally, you can reach out to Addmotor’s customer service or visit an authorized service center for professional assistance.

5. Can I install additional accessories or upgrades on my Addmotor HEROTAN M-65X?

Yes, the Addmotor HEROTAN M-65X is designed to be customizable. You can install additional accessories and upgrades to enhance your riding experience. Be sure to follow the manufacturer’s guidelines and recommendations for compatibility and installation.


For any issues or concerns related to your Addmotor HEROTAN M-65X electric bike, it’s advisable to always refer to the user manual for guidance. Additionally, if you encounter technical problems or require further assistance, do not hesitate to contact Addmotor’s customer service or visit an authorized service center. They are equipped to provide expert support and ensure your electric bike operates smoothly.

Addmotor GRANDTAN PLUS Common Problems
Addmotor GRANDTAN CITY Common Problems
Addmotor CITYTRI E-310 Mini Common Problems

Leave a Comment