Written By Doug Smirnoff

CERO One Common Problems and Troubleshooting

The CERO One is a versatile electric bike designed to meet a variety of daily needs, including commuting, running errands, transporting kids, and leisure riding. In this article, we will explore common problems that CERO One owners may encounter and provide troubleshooting solutions tailored to this specific electric bike model.

CERO One Overview

The CERO One is the ultimate compact electric cargo bike, offering a perfect balance between size and functionality. Here’s a brief overview of its key features and specifications:

Product DetailsFeatures
Weight: 58.2 lbsOne Bike for All Your Daily Needs
Length: 68.3 inBuilt to Carry Cargo
Range: 105 miSmooth and Powerful
MOTOR: Shimano STEPS E6100, 60 Nm torqueEasy to Ride
BATTERY: Shimano E8010, 504 Wh, removableBuilt to Last

Causes of Common Problems with the CERO One

This section will address possible problems and solutions specific to the CERO One electric bike.

Common Problems and Troubleshooting for CERO One

1. Battery Not Charging

Description: The battery on your CERO One electric bike is not charging properly, leading to reduced range and performance.

Cause: This issue may occur due to a faulty charger, poor connection, or a worn-out battery.

Troubleshooting: Follow these steps to troubleshoot the problem:

  1. Ensure the charger is properly connected to both the wall outlet and the bike’s battery port.
  2. Check for any visible damage or wear on the charger and cable. Replace if necessary.
  3. If the battery still doesn’t charge, it may need replacement. Contact CERO customer support for assistance.

2. Motor Assistance Intermittent

Description: The motor assistance on your CERO One electric bike is sporadic, making it difficult to maintain consistent speed.

Cause: This issue can be caused by loose wiring connections, a malfunctioning sensor, or a weak battery.

Troubleshooting: Try the following steps to resolve the problem:

  1. Inspect all wiring connections around the motor and sensor. Make sure they are securely attached.
  2. Check the sensor for dirt or debris that might obstruct its function. Clean if necessary.
  3. If the problem persists, consider replacing the battery or contacting CERO’s technical support for further assistance.

3. Brakes Squeaking or Grinding

Description: Your CERO One’s brakes produce a squeaking or grinding noise when applied, affecting stopping performance.

Cause: This issue can arise from contaminated brake pads, misaligned brake components, or worn-out brake pads.

Troubleshooting: Follow these steps to address the brake noise problem:

  1. Inspect the brake pads for any contamination, such as dirt or oil. Clean or replace them as needed.
  2. Check for brake pad alignment and ensure they are properly aligned with the wheel rims. Adjust if necessary.
  3. If the noise continues, consider replacing the brake pads with new ones designed for your CERO One model.

4. Display Screen Not Functioning

Description: The display screen on your CERO One electric bike is not functioning, making it challenging to monitor vital information.

Cause: This issue may be due to loose cables, a damaged display unit, or a software malfunction.

Troubleshooting: Try the following steps to troubleshoot the display screen problem:

  1. Check the cable connections between the display unit and the bike’s electronics. Ensure they are securely connected.
  2. If the cables are intact, try resetting the display unit to its default settings. Refer to your user manual for instructions.
  3. If the problem persists, contact CERO’s customer support for further assistance or to inquire about a replacement display unit.

5. Tire Puncture

Description: You’ve experienced a flat tire on your CERO One, which can hinder your riding experience.

Cause: Flat tires can result from punctures caused by sharp objects or improper tire maintenance.

Troubleshooting: To address a tire puncture issue on your CERO One, follow these steps:

  1. Inspect the tire for visible punctures or foreign objects lodged in the tire tread.
  2. If you find a puncture, remove the object and patch the tire using a bicycle tire repair kit. Alternatively, replace the inner tube if necessary.
  3. Consider investing in puncture-resistant tires or tire liners to prevent future flats.

6. Gear Shifting Issues

Description: You’re experiencing difficulties when shifting gears on your CERO One, leading to an inconsistent and uncomfortable riding experience.

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

Troubleshooting: To address gear shifting problems:

  1. Inspect the gear cables for signs of fraying or damage. Replace them if necessary.
  2. Check the alignment of the front and rear derailleurs. Adjust them to ensure precise gear shifting.
  3. If the problem persists, consider replacing worn-out components, such as the shifters or cassette.

7. Sudden Loss of Power

Description: Your CERO One electric bike occasionally experiences a sudden loss of power while riding, causing unexpected slowdowns.

Cause: This issue may occur due to overheating of the motor, a loose battery connection, or a fault in the electrical system.

Troubleshooting: To address sudden power loss:

  1. Allow the motor to cool down if it has overheated. Avoid pushing the motor beyond its limits for extended periods.
  2. Check the battery connection to ensure it’s securely attached. Tighten any loose connections.
  3. If the problem continues, consult a professional electric bike technician to diagnose and repair any electrical faults.

8. Unusual Noises from the Motor

Description: You’ve noticed unusual noises coming from the motor of your CERO One, which can be concerning and affect the overall riding experience.

Cause: Unusual motor noises may be caused by loose components, worn-out bearings, or internal motor issues.

Troubleshooting: To address motor noise problems:

  1. Inspect the motor and its surrounding components for loose parts. Tighten them as necessary.
  2. If the noise persists, it may indicate worn-out bearings. Contact a professional technician for bearing replacement.
  3. If the issue is internal to the motor, reach out to CERO’s customer support or a certified electric bike repair center for further diagnosis and repair.

9. Flickering Lights

Description: The lights on your CERO One electric bike, such as the headlight or taillight, flicker or intermittently turn off during rides, compromising safety.

Cause: Flickering lights can result from loose wiring connections, a faulty switch, or a drained battery.

Troubleshooting: To address flickering light issues:

  1. Inspect the wiring connections for the lights, making sure they are secure. Replace any damaged wires.
  2. Check the switch for proper functionality. If it’s faulty, consider replacing it with a new switch compatible with your CERO One model.
  3. Ensure the battery is adequately charged. Recharge the battery if needed.

10. Unresponsive Display

Description: The display screen on your CERO One remains unresponsive, preventing you from accessing important information and settings.

Cause: An unresponsive display can occur due to software glitches, a frozen screen, or damaged touch-sensitive components.

Troubleshooting: To address an unresponsive display:

  1. Attempt to reset the display unit by following the instructions in your user manual.
  2. If the screen remains unresponsive, try performing a firmware update if available from the manufacturer.
  3. If these steps don’t resolve the issue, contact CERO’s customer support or a qualified technician for further assistance.

11. Uneven Braking

Description: Your CERO One’s brakes exhibit uneven braking performance, causing instability and potential safety concerns.

Cause: Uneven braking can result from misaligned brake pads, uneven wear, or contamination on the braking surfaces.

Troubleshooting: To address uneven braking:

  1. Inspect the brake pads for even wear and contamination. Clean or replace them as needed.
  2. Check the alignment of the brake calipers and ensure they are properly centered on the wheel rims.
  3. If the problem persists, consider upgrading to high-quality brake pads and consult a bike technician for professional adjustment.

12. Saddle Discomfort

Description: You experience discomfort or pain while riding your CERO One, primarily due to issues with the saddle.

Cause: Saddle discomfort may result from an improper saddle height, inadequate padding, or an unsuitable saddle design.

Troubleshooting: To address saddle discomfort:

  1. Adjust the saddle height to ensure it suits your riding posture. Refer to the bike’s user manual for guidance.
  2. If the saddle lacks sufficient padding, consider installing a gel or memory foam saddle cover for added comfort.
  3. If discomfort persists, explore alternative saddle designs that better match your riding style and body anatomy.

13. Chain Slippage

Description: The chain on your CERO One occasionally slips or skips gears, disrupting your pedaling rhythm.

Cause: Chain slippage can occur due to a loose chain, worn-out chainrings or cassette, or improper gear shifting.

Troubleshooting: To address chain slippage:

  1. Check the chain tension and ensure it’s properly tensioned. Adjust it as needed according to your bike’s specifications.
  2. Inspect the chainrings and cassette for signs of wear. Replace them if they show excessive wear or damage.
  3. Practice smooth and deliberate gear shifting to minimize the risk of chain slippage during rides.

14. Wobbling Front Wheel

Description: You notice a wobbling sensation in the front wheel of your CERO One, affecting stability and handling.

Cause: A wobbling front wheel can result from loose spokes, misaligned wheel truing, or an unbalanced load on the front cargo rack.

Troubleshooting: To address a wobbling front wheel:

  1. Check the spoke tension on the front wheel. Tighten any loose spokes to achieve proper tension.
  2. Inspect the wheel truing to ensure it’s properly aligned. Adjust the truing as necessary.
  3. If you have a front cargo rack, ensure that the cargo load is evenly distributed to avoid imbalance.

15. Inconsistent Pedal Assistance

Description: The pedal assistance on your CERO One varies in intensity, making it challenging to predict and control your riding experience.

Cause: Inconsistent pedal assistance may occur due to fluctuations in battery power, sensor issues, or software glitches.

Troubleshooting: To address inconsistent pedal assistance:

  1. Ensure your battery is fully charged before each ride to minimize power fluctuations.
  2. Inspect the pedal-assist sensor for dirt or damage. Clean or replace it if needed.
  3. If the problem persists, consult the manufacturer for firmware updates or contact CERO’s technical support for further assistance.

16. Loose Handlebars

Description: The handlebars on your CERO One electric bike feel loose or wobbly, affecting your steering control.

Cause: Loose handlebars may result from improper stem adjustment, worn-out headset bearings, or loose handlebar grips.

Troubleshooting: To address loose handlebars:

  1. Check the stem and headset for proper tightness. Adjust the stem bolts if necessary to secure the handlebars.
  2. Inspect the headset bearings for wear and replace them if they are damaged.
  3. Ensure the handlebar grips are securely fastened, and replace them if they have become worn or loose.

17. Frequent Flat Tires

Description: You regularly experience flat tires on your CERO One electric bike, causing inconvenience and disruptions to your rides.

Cause: Frequent flat tires can occur due to sharp objects on the road, low tire pressure, or inadequate tire protection.

Troubleshooting: To address frequent flat tires:

  1. Inspect the tires for embedded objects, such as glass or thorns, and remove them carefully.
  2. Maintain proper tire pressure by checking and inflating your tires to the recommended levels before each ride.
  3. Consider using puncture-resistant tire liners or upgrading to more robust, flat-resistant tires for enhanced protection.

18. Sluggish Acceleration

Description: Your CERO One electric bike exhibits sluggish acceleration, making it challenging to pick up speed quickly.

Cause: Sluggish acceleration may result from a weak battery, motor issues, or throttle or pedal assist malfunctions.

Troubleshooting: To address sluggish acceleration:

  1. Ensure your battery is adequately charged and in good condition. Replace it if it no longer holds a charge effectively.
  2. Check the motor for any signs of damage or malfunction. Contact a professional technician for motor diagnostics and repairs.
  3. If you use pedal assist or throttle, inspect these components for proper functionality and replace them if necessary.

19. Loose or Unstable Cargo

Description: The cargo on your CERO One electric bike’s rack feels loose or unstable during rides, potentially compromising safety.

Cause: Cargo instability can result from improper loading, loose rack attachments, or insufficient securing methods.

Troubleshooting: To address loose or unstable cargo:

  1. Properly distribute the cargo weight on the racks to ensure even balance and stability.
  2. Check and tighten all rack attachments, ensuring they are securely fastened to the frame.
  3. Use appropriate cargo securing methods such as bungee cords, cargo nets, or straps to keep items in place during your rides.

20. Pedal Misalignment

Description: Your pedals on the CERO One electric bike occasionally feel misaligned, affecting your pedaling efficiency.

Cause: Pedal misalignment may occur due to loose pedal threads, worn pedal bearings, or improper installation.

Troubleshooting: To address pedal misalignment:

  1. Inspect the pedal threads and ensure they are properly tightened. Use a pedal wrench to secure them if necessary.
  2. Check the pedal bearings for wear and replace them if they are no longer smooth and functional.
  3. Reinstall the pedals, making sure they are correctly aligned with the crank arms and tightened to the manufacturer’s specifications.

21. Excessive Chain Noise

Description: The chain on your CERO One electric bike produces excessive noise during pedaling, which can be annoying and distracting.

Cause: Excessive chain noise may result from a dirty or dry chain, misaligned chainrings, or insufficient lubrication.

Troubleshooting: To address excessive chain noise:

  1. Clean the chain thoroughly with a chain cleaner and lubricate it with bicycle-specific chain oil.
  2. Check the chainrings for proper alignment, ensuring they are parallel to the chain and free from damage.
  3. Maintain regular chain maintenance by cleaning and lubricating it at recommended intervals.

22. Unsteady Cargo Handling

Description: You experience challenges in handling cargo on your CERO One electric bike, especially when taking corners or navigating uneven terrain.

Cause: Unsteady cargo handling can occur due to improper cargo placement, unsecured loads, or inadequate cargo rack adjustments.

Troubleshooting: To improve cargo handling:

  1. Ensure cargo items are securely fastened to the cargo rack, using appropriate securing methods such as straps or bungee cords.
  2. Position heavier cargo items closer to the bike’s center of gravity for improved stability.
  3. Regularly inspect and adjust the cargo rack for level and proper alignment, making sure it’s securely attached to the frame.

23. Flickering Headlights

Description: The headlights on your CERO One electric bike flicker or dim inconsistently, compromising visibility during night rides.

Cause: Flickering headlights may result from loose wiring connections, a failing battery, or a malfunctioning headlight unit.

Troubleshooting: To address flickering headlights:

  1. Inspect the wiring connections for the headlight and ensure they are tightly secured. Replace any damaged wires.
  2. Check the battery’s health and charge level, replacing it if necessary to maintain consistent power supply to the headlight.
  3. If the flickering persists, consider replacing the headlight unit with a compatible, reliable component.

24. Brake Lever Sponginess

Description: The brake levers on your CERO One electric bike feel spongy or soft, affecting braking responsiveness.

Cause: Brake lever sponginess can occur due to air bubbles in the brake lines, worn brake pads, or contaminated brake fluid.

Troubleshooting: To address brake lever sponginess:

  1. Bleed the brake lines to remove air bubbles and restore brake lever firmness. Refer to your bike’s manual for bleeding instructions.
  2. Inspect the brake pads for wear and replace them if they are thin or damaged.
  3. If the issue persists, consult a professional bike mechanic for a thorough brake system inspection and maintenance.

25. Inconsistent Range

Description: The range of your CERO One electric bike varies significantly, making it challenging to plan longer rides.

Cause: Inconsistent range may be due to fluctuations in battery health, terrain, riding conditions, or power mode settings.

Troubleshooting: To address inconsistent range:

  1. Maintain your battery in good health by following proper charging and storage practices. Replace an aging battery if necessary.
  2. Consider the terrain and riding conditions, as hilly terrain and strong headwinds can reduce range. Plan routes accordingly.
  3. Adjust your power mode settings to optimize battery usage for longer rides and maintain a consistent speed.

CERO One Electric Bike User Reviews

Discover what CERO One Electric Bike users have to say about their experiences with this versatile electric bike. We’ve summarized both the positive and negative reviews available online from cero.bike customers. Please note that these summaries are not direct quotes but a compilation of common themes and feedback from users.

Positive Reviews from CERO One Electric Bike Users

  • Some users were satisfied with the impressive cargo-carrying capabilities of the CERO One Electric Bike. They found it convenient for transporting groceries, backpacks, and even children, thanks to the modular cargo rack system.
  • Many users appreciated the smooth and powerful performance provided by the Shimano E6100 motor system. The pedal-assist feature helped them effortlessly navigate various terrains and maintain higher speeds.
  • Several riders praised the user-friendly design of the CERO One, highlighting features like the low-step frame for easy on-and-off access and the small front wheel for improved stability during stops and loaded rides.
  • Customers were pleased with the durability and quality of the CERO One Electric Bike, noting the strong aluminum frame and components from reputable brands like Shimano, ABUS, Schwalbe, Ergon, and Gates.
  • Overall, the majority of users found the CERO One Electric Bike to be a reliable and versatile choice for their daily commuting, errands, and leisure rides.

Negative User Reviews of the CERO One Electric Bike

  • Some users were not satisfied with the bike’s weight, finding it heavier than expected. Maneuvering and storing the CERO One Electric Bike in tight spaces proved challenging for a few individuals.
  • A subset of riders reported issues with the battery’s range, stating that it fell short of the advertised 105 miles in real-world use. Terrain and load can significantly impact the bike’s range.
  • There were complaints about occasional motor hiccups, such as intermittent power losses or inconsistent pedal assistance. These issues can affect the overall riding experience.
  • A few users mentioned concerns about the bike’s pricing, deeming it relatively high compared to other electric bikes with similar features. Cost-conscious buyers may find it less budget-friendly.
  • While the majority of customers were satisfied, some experienced minor problems with components like brakes and gears. These issues may require occasional maintenance.

In summary, the CERO One Electric Bike has garnered positive feedback from the majority of users, who appreciate its cargo-carrying capabilities, motor performance, user-friendly design, durability, and versatility. While there are some concerns related to weight, battery range, occasional motor issues, pricing, and component maintenance, these appear to be isolated experiences compared to the overall satisfaction of CERO One Electric Bike owners.

CERO One Electric Bike Manual

If you are looking for the operating instructions and user manual for the CERO One Electric Bike, you can find them on the manufacturer’s official website. Visit cero.bike to access the comprehensive manual, which provides essential information on assembly, operation, maintenance, and troubleshooting for your CERO One Electric Bike.

CERO One Frequently Asked Questions

1. How do I assemble my CERO One Electric Bike?

Assembling your CERO One Electric Bike is straightforward and covered in the user manual. Follow the step-by-step instructions provided in the manual to ensure a safe and proper assembly process.

2. What should I do if my CERO One experiences a sudden loss of power?

If you encounter a sudden loss of power, first check the battery’s charge level. Ensure it’s adequately charged. If the issue persists, consult the troubleshooting section in the manual or contact customer service for assistance.

3. How can I improve the range of my CERO One Electric Bike?

To maximize your bike’s range, maintain the battery properly by following recommended charging and storage practices. Plan routes that consider terrain and wind conditions, and use the appropriate power mode settings for your desired range.

4. What should I do if my CERO One’s display becomes unresponsive?

If the display screen becomes unresponsive, refer to the troubleshooting section in the manual for potential solutions. You can also reach out to customer service or a service center for further assistance.

5. Can I carry a child on my CERO One Electric Bike?

Yes, the CERO One is designed to carry one adult and one child with an optional child seat. Ensure that you follow safety guidelines and secure the child seat properly according to the manual’s instructions.

6. What is the recommended maintenance schedule for my CERO One?

The recommended maintenance schedule can be found in the user manual. It includes regular check-ups, cleaning, and lubrication of components. Following this schedule will help ensure the longevity and optimal performance of your bike.

7. How can I address pedal misalignment issues?

If you experience pedal misalignment, inspect the pedal threads, tighten them if necessary, and ensure the pedals are correctly aligned with the crank arms. Detailed instructions can be found in the manual’s maintenance section.

8. Is the CERO One suitable for hilly terrain?

Yes, the CERO One can handle hilly terrain with its Shimano E6100 motor system. It provides pedal assistance to help you conquer inclines more easily. Refer to the manual for tips on optimizing your ride on hilly routes.

9. How do I address brake lever sponginess?

If you encounter brake lever sponginess, bleeding the brake lines can help remove air bubbles and restore firmness. Consult the manual for detailed instructions on this procedure or seek assistance from a professional bike mechanic.

10. What should I do if I experience unusual noises from the motor?

If you hear unusual noises from the motor, inspect the motor and surrounding components for loose parts. Tighten them as needed. If the issue persists, contact customer service or a service center for further diagnostics and potential repairs.


For any issues or concerns with your CERO One Electric Bike, always refer to the user manual first. It provides valuable guidance on assembly, operation, maintenance, and troubleshooting. If you require additional assistance, do not hesitate to contact the manufacturer’s customer service or visit an authorized service center for professional support.

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