Despite the commendable features and performance of the Propella 9S Pro, like its superior parts offering enhanced power and speed, and its high build quality with features such as hydraulic disc brakes and larger tires, this eBike model is not without its common issues.

vbnetCopy code

One notable concern that some riders have encountered is the absence of a throttle, which might be a drawback for those who prefer more control over their speed. Additionally, the conspicuous battery design could potentially attract unwanted attention from thieves, prompting users to take extra precautions to secure their eBike.

While the Propella 9S Pro excels in many aspects, it’s important to address these common problems to ensure a smooth and enjoyable riding experience. In this article, we’ll delve into these issues and provide troubleshooting tips to help riders overcome these challenges. We’ll also draw from real experiences of owning this model, offering practical insights for prospective and current owners alike.

Specifications

Features

• Urban
• Commuter
• Headlight
• Hydraulic brakes
• LCD Display
• Lightweight
• Pedal Assist
• Torque sensor
• Buy at Propella

Causes of Common Problems with the Propella 9S PRO

In this section, we’ll delve into the causes of common problems that riders may encounter with the Propella 9S PRO. Understanding these issues is the first step towards finding effective solutions.

Later in this article, we’ll explore troubleshooting methods and provide solutions to help riders address these common problems, ensuring a smoother and more enjoyable riding experience.

1. Battery Not Charging – Propella 9S PRO

• Description of the problem: Riders may encounter issues where the battery of their Propella 9S PRO electric bike is not charging properly or at all.
• Cause of the problem: The battery charger may be faulty, or there could be issues with the battery connection.
• Troubleshooting step-by-step:
  1. Check the power source and ensure it’s functioning correctly.
  2. Inspect the battery charger for any damage or loose connections.
  3. Verify that the battery is properly connected to the charger and the bike.
  4. If the charger and connections are fine, consider replacing the battery or seeking professional assistance.

2. Motor Stopping Unexpectedly – Propella 9S PRO

• Description of the problem: Some riders may experience instances where the motor of their Propella 9S PRO electric bike stops unexpectedly during operation.
• Cause of the problem: This issue could be due to overheating, motor controller malfunction, or wiring issues.
• Troubleshooting step-by-step:
  1. Allow the motor to cool down if overheating is suspected, and avoid prolonged continuous usage.
  2. Inspect the motor controller for any signs of damage or loose connections.
  3. Check the wiring harness for any frayed wires or loose connections.
  4. If no visible issues are found, consider resetting the motor controller or consulting a professional technician.

3. Display Malfunction – Propella 9S PRO

• Description of the problem: Riders may encounter issues where the display unit on their Propella 9S PRO electric bike malfunctions, displaying incorrect information or not functioning at all.
• Cause of the problem: This problem could arise due to display unit failure, wiring issues, or software glitches.
• Troubleshooting step-by-step:
  1. Check the wiring connections between the display unit and the bike’s electronics.
  2. Attempt to reset the display unit by disconnecting and reconnecting its power source.
  3. If the issue persists, consider updating the display unit’s firmware if applicable, or contact customer support for further assistance.

4. Brakes Squeaking or Grinding – Propella 9S PRO

• Description of the problem: Some riders may experience squeaking or grinding noises when applying the brakes on their Propella 9S PRO electric bike.
• Cause of the problem: Brake pad contamination, worn brake pads, or misalignment of the brake calipers could be the cause of this issue.
• Troubleshooting step-by-step:
  1. Inspect the brake pads for any signs of contamination or wear. Clean or replace them if necessary.
  2. Check the brake calipers for proper alignment with the brake rotors.
  3. If the issue persists, consider adjusting the brake cable tension or seeking professional maintenance.

5. Pedal Assist Not Functioning – Propella 9S PRO

• Description of the problem: Riders may find that the pedal assist feature on their Propella 9S PRO electric bike is not functioning as expected, providing inconsistent or no assistance.
• Cause of the problem: This issue could be due to sensor malfunction, wiring issues, or software glitches.
• Troubleshooting step-by-step:
  1. Check the wiring connections between the pedal assist sensor and the bike’s electronics.
  2. Inspect the pedal assist sensor for any signs of damage or misalignment.
  3. Attempt to reset the pedal assist system by turning the bike off and on again.
  4. If the problem persists, consider recalibrating the pedal assist system or contacting customer support for assistance.

Battery Draining Quickly – Propella 9S PRO

• Description of the problem: Some riders may notice that the battery of their Propella 9S PRO electric bike is draining quickly, resulting in reduced range per charge.
• Cause of the problem: Excessive power consumption due to riding conditions, battery age, or battery management system issues could contribute to this problem.
• Troubleshooting step-by-step:
  1. Assess riding conditions and adjust riding style to optimize battery usage.
  2. Check the battery health and consider replacing it if it’s old or degraded.
  3. Inspect the battery management system for any faults or errors.
  4. If necessary, recalibrate the battery or seek professional assistance for further diagnosis and repair.

Noisy Chain – Propella 9S PRO

• Description of the problem: Riders may experience excessive noise coming from the chain of their Propella 9S PRO electric bike, particularly during pedaling.
• Cause of the problem: Chain misalignment, insufficient lubrication, or worn chain components could be responsible for this issue.
• Troubleshooting step-by-step:
  1. Inspect the chain for signs of wear, such as stretched links or damaged rollers.
  2. Clean and lubricate the chain thoroughly, ensuring proper lubrication of all moving parts.
  3. Check the chain tension and adjust it if necessary to ensure proper alignment.
  4. If the noise persists, consider replacing the chain or seeking professional maintenance.

Loose Bolts and Fasteners – Propella 9S PRO

• Description of the problem: Riders may encounter issues with loose bolts and fasteners on their Propella 9S PRO electric bike, leading to potential safety hazards and component damage.
• Cause of the problem: Vibration during riding, inadequate torque settings, or poor assembly could result in loosening of bolts and fasteners over time.
• Troubleshooting step-by-step:
  1. Regularly inspect all bolts and fasteners on the bike for tightness and security.
  2. Use a torque wrench to ensure proper tightening of critical components according to manufacturer specifications.
  3. Apply thread-locking compound to critical fasteners to prevent them from loosening over time.
  4. If bolts are consistently loosening, investigate potential causes such as frame flex or component wear.

Unresponsive Pedal Assist – Propella 9S PRO

• Description of the problem: Some riders may experience issues with unresponsive pedal assist on their Propella 9S PRO electric bike, where the assistance level does not change or engage properly.
• Cause of the problem: Sensor malfunction, software glitches, or connectivity issues could lead to unresponsive pedal assist functionality.
• Troubleshooting step-by-step:
  1. Check the pedal assist sensor for proper alignment and cleanliness.
  2. Ensure that the pedal assist system is properly activated and configured according to user preferences.
  3. If using a mobile app for pedal assist settings, verify connectivity and try recalibrating the system.
  4. If the issue persists, consider updating firmware or seeking assistance from customer support.

Uneven Braking Performance – Propella 9S PRO

• Description of the problem: Riders may notice inconsistent braking performance on their Propella 9S PRO electric bike, where one brake engages more forcefully than the other, leading to instability during braking.
• Cause of the problem: Brake caliper misalignment, uneven brake pad wear, or hydraulic system imbalance could result in uneven braking performance.
• Troubleshooting step-by-step:
  1. Inspect brake calipers for alignment and adjust as needed to ensure even contact with brake rotors.
  2. Check brake pads for wear and replace if one side is significantly more worn than the other.
  3. Bleed hydraulic brake lines to remove air bubbles and ensure consistent brake performance.
  4. If the issue persists, consult a professional bike mechanic for further diagnosis and adjustment.

Chain Slippage – Propella 9S PRO

• Description of the problem: Riders may encounter instances where the chain slips or skips gears while pedaling their Propella 9S PRO electric bike, resulting in inconsistent power delivery.
• Cause of the problem: Chain wear, misalignment of gears, or issues with the derailleur could lead to chain slippage.
• Troubleshooting step-by-step:
  1. Inspect the chain for signs of wear, such as elongation or damage to the links.
  2. Check the alignment of gears and ensure that they are properly indexed.
  3. Adjust the derailleur settings to ensure smooth shifting and proper chain tension.
  4. If the issue persists, consider replacing the chain or seeking professional bike maintenance.

Unstable Handling – Propella 9S PRO

• Description of the problem: Some riders may experience instability or wobbling while riding their Propella 9S PRO electric bike, particularly at higher speeds or during turns.
• Cause of the problem: Improper bike fit, misaligned wheels, or issues with the suspension system could contribute to unstable handling.
• Troubleshooting step-by-step:
  1. Adjust saddle height and position to ensure proper bike fit and weight distribution.
  2. Check wheel alignment and spoke tension to ensure that wheels are true and properly tensioned.
  3. Inspect suspension components for damage or wear and adjust settings as needed for optimal performance.
  4. If instability persists, consider seeking professional bike fitting or suspension setup.

Intermittent Power Loss – Propella 9S PRO

• Description of the problem: Riders may experience intermittent power loss or fluctuations in motor assistance while riding their Propella 9S PRO electric bike, resulting in unpredictable performance.
• Cause of the problem: Connectivity issues, battery voltage fluctuations, or motor controller malfunctions could cause intermittent power loss.
• Troubleshooting step-by-step:
  1. Check all electrical connections for tightness and security, including battery, motor, and controller connections.
  2. Monitor battery voltage during riding to identify any sudden drops or fluctuations.
  3. Inspect the motor controller for signs of overheating or damage, and reset if necessary.
  4. If power loss persists, consult a professional technician for further diagnosis and repair.

Excessive Noise from Motor – Propella 9S PRO

• Description of the problem: Riders may notice excessive noise emanating from the motor of their Propella 9S PRO electric bike during operation, such as grinding, whining, or buzzing sounds.
• Cause of the problem: Motor bearing wear, internal gear damage, or motor controller issues could contribute to excessive motor noise.
• Troubleshooting step-by-step:
  1. Inspect the motor housing for any signs of damage or loose components.
  2. Listen for abnormal sounds and attempt to identify the source of the noise within the motor assembly.
  3. If possible, disassemble the motor assembly to inspect internal components for wear or damage.
  4. If the noise persists, consider replacing the motor assembly or seeking professional maintenance.

Difficulty Shifting Gears – Propella 9S PRO

• Description of the problem: Riders may encounter difficulty shifting gears smoothly on their Propella 9S PRO electric bike, experiencing hesitation, or incomplete gear changes.
• Cause of the problem: Misadjusted derailleur, cable tension issues, or worn drivetrain components could lead to difficulty shifting gears.
• Troubleshooting step-by-step:
  1. Inspect the derailleur alignment and adjust as needed to ensure proper shifting performance.
  2. Check cable tension and adjust if necessary to ensure smooth operation of the shifters.
  3. Inspect chainrings, cassette, and chain for wear, and replace components if excessively worn.
  4. If shifting issues persist, consider replacing cables or seeking professional bike maintenance.

Wheel Misalignment – Propella 9S PRO

• Description of the problem: Some riders may notice wheel misalignment issues on their Propella 9S PRO electric bike, resulting in uneven tire wear and handling instability.
• Cause of the problem: Improper installation, loose axle nuts, or frame misalignment could lead to wheel misalignment.
• Troubleshooting step-by-step:
  1. Check axle nuts on both wheels to ensure they are tightened securely and evenly.
  2. Inspect frame alignment and dropout alignment to ensure proper wheel positioning.
  3. If necessary, adjust wheel position within the dropouts and re-tighten axle nuts to correct alignment.
  4. If misalignment persists, consult a professional bike mechanic for further diagnosis and adjustment.

Sudden Loss of Power Assistance – Propella 9S PRO

• Description of the problem: Riders may experience sudden loss of power assistance while riding their Propella 9S PRO electric bike, resulting in increased pedaling effort.
• Cause of the problem: Battery depletion, controller malfunction, or sensor issues could lead to sudden loss of power assistance.
• Troubleshooting step-by-step:
  1. Check battery charge level and recharge if necessary to ensure sufficient power supply.
  2. Inspect motor controller for any signs of damage or malfunction.
  3. Check pedal assist sensor and throttle for proper operation and connectivity.
  4. If the issue persists, consult a professional technician for further diagnosis and repair.

Rattling Noise from Frame – Propella 9S PRO

• Description of the problem: Riders may notice a rattling noise emanating from the frame of their Propella 9S PRO electric bike during riding, especially on rough terrain.
• Cause of the problem: Loose components, frame cracks, or internal cable rattling could contribute to rattling noises from the frame.
• Troubleshooting step-by-step:
  1. Inspect all frame components, including bolts, screws, and welds, for signs of looseness or damage.
  2. Check internal cable routing for secure attachment and potential contact with frame components.
  3. If frame cracks are suspected, discontinue riding and have the frame inspected by a professional bike mechanic.
  4. Tighten or secure any loose components and cables to eliminate rattling noises.

Inconsistent Display Readings – Propella 9S PRO

• Description of the problem: Riders may experience inconsistencies or inaccuracies in the readings displayed on the control panel of their Propella 9S PRO electric bike.
• Cause of the problem: Display unit malfunction, sensor issues, or wiring problems could lead to inconsistent display readings.
• Troubleshooting step-by-step:
  1. Check wiring connections between the display unit and other bike components for loose or damaged connections.
  2. Inspect sensors for proper operation and alignment, ensuring they are securely attached to the bike.
  3. Reset the display unit and recalibrate sensors if available in the bike’s settings menu.
  4. If the problem persists, consider replacing the display unit or seeking professional assistance.

Charging Port Malfunction – Propella 9S PRO

• Description of the problem: Riders may encounter issues with the charging port of their Propella 9S PRO electric bike, such as difficulty inserting the charger or inconsistent charging.
• Cause of the problem: Charging port damage, dirt or debris accumulation, or electrical connection issues could lead to charging port malfunction.
• Troubleshooting step-by-step:
  1. Inspect the charging port for any signs of damage, dirt, or debris, and clean if necessary.
  2. Check the charger for proper alignment and fit with the charging port, ensuring a secure connection.
  3. Test the charger with another compatible device to verify its functionality.
  4. If the issue persists, consider replacing the charging port or seeking professional maintenance.

Brake Squealing – Propella 9S PRO

• Description of the problem: Riders may experience brake squealing or screeching noises when applying the brakes on their Propella 9S PRO electric bike.
• Cause of the problem: Contaminated brake pads, glazed brake surfaces, or misaligned brake calipers could lead to brake squealing.
• Troubleshooting step-by-step:
  1. Inspect brake pads for any signs of contamination, such as oil or debris, and clean if necessary.
  2. Scuff brake pad surfaces with sandpaper to remove glazing and improve brake performance.
  3. Check brake caliper alignment and adjust as needed to ensure even contact with brake rotors.
  4. If brake squealing persists, consider replacing brake pads or seeking professional maintenance.

Display Malfunction – Propella 9S PRO

• Description of the problem: Riders may encounter issues with the display unit of their Propella 9S PRO electric bike, such as blank screens, flickering displays, or unresponsive buttons.
• Cause of the problem: Display unit damage, water ingress, or electrical faults could lead to display malfunctions.
• Troubleshooting step-by-step:
  1. Ensure that the display unit is securely connected to the bike and that all wiring connections are intact.
  2. Inspect the display unit for signs of physical damage or water ingress, and clean or dry if necessary.
  3. Reset the display unit and check for firmware updates to address any software-related issues.
  4. If the problem persists, consider replacing the display unit or seeking professional assistance.

Pedal Resistance – Propella 9S PRO

• Description of the problem: Riders may encounter increased pedal resistance or stiffness while pedaling their Propella 9S PRO electric bike, making it difficult to maintain speed.
• Cause of the problem: Drivetrain friction, improper chain tension, or bottom bracket issues could contribute to pedal resistance.
• Troubleshooting step-by-step:
  1. Inspect the drivetrain components, including chain, cassette, and chainring, for signs of wear or damage.
  2. Ensure that the chain is properly lubricated and that there are no tight spots or binding in the drivetrain.
  3. Check bottom bracket bearings for smooth operation and replace if necessary.
  4. If pedal resistance persists, consider adjusting derailleur settings or seeking professional bike maintenance.

Unresponsive Throttle – Propella 9S PRO

• Description of the problem: Some riders may experience issues with the throttle of their Propella 9S PRO electric bike, where it becomes unresponsive or intermittently cuts out.
• Cause of the problem: Throttle sensor malfunction, wiring issues, or throttle grip damage could lead to unresponsive throttle behavior.
• Troubleshooting step-by-step:
  1. Check throttle wiring connections for looseness or damage, and ensure proper connection to the controller.
  2. Inspect throttle grip for any signs of damage or wear, and replace if necessary.
  3. Test throttle response across its range of motion and verify proper functionality.
  4. If the issue persists, consider replacing the throttle unit or seeking professional assistance.

Excessive Vibration – Propella 9S PRO

• Description of the problem: Riders may notice excessive vibration or shaking while riding their Propella 9S PRO electric bike, particularly at higher speeds.
• Cause of the problem: Imbalanced wheels, loose components, or worn suspension components could lead to excessive vibration.
• Troubleshooting step-by-step:
  1. Check wheel balance and trueness, and have wheels trued or balanced if necessary.
  2. Inspect all bike components for tightness and security, including bolts, nuts, and quick releases.
  3. Check suspension components for wear or damage, and adjust or replace as needed.
  4. If excessive vibration persists, consult a professional bike mechanic for further diagnosis and adjustment.

Propella 9S PRO Electric Bike User Reviews

Here’s a look at what users have to say about their experiences with the Propella 9S PRO electric bike.

Positive Reviews from Propella 9S PRO Users

• Some users were satisfied with the superior parts and components of the Propella 9S PRO, which provided them with more power and speed than expected.
• Many riders praised the smooth operation and responsive riding experience of the bike, making their daily commutes enjoyable and hassle-free.
• The reasonable price combined with the attractive design of the Propella 9S PRO was a highlight for several users, offering them a stylish and efficient transportation solution.
• Users appreciated the efficient, lightweight build of the bike, which made it easy to navigate through city streets and traffic with ease.
• The high build quality with upgraded features was a common positive experience among users, ensuring a reliable and durable electric bike for daily use.
• Several riders were impressed with the ride quality of the Propella 9S PRO, noting its impressive balance of speed and power, making it a joy to ride.
• Many users found the braking power to be excellent and were satisfied with the sufficient battery performance, providing them with peace of mind during their rides.

Overall, positive feedback from Propella 9S PRO customers highlights the bike’s superior performance, efficiency, and reliability, making it a popular choice for urban commuters.

Negative User Reviews of the Propella 9S PRO

• Some users were not satisfied with the lack of a throttle, finding it to be a drawback, especially for those who prefer more control over their speed.
• Several riders expressed concerns about the conspicuous battery design, fearing it may attract unwanted attention from potential thieves.
• Users provided suggestions for improvement, including internal cable routing and better quality/color of the chain, indicating areas where the bike could be enhanced for better functionality and aesthetics.

Overall, while some users had specific concerns about certain features of the Propella 9S PRO, the majority of users were satisfied with its performance, build quality, and overall riding experience.

Propella 9S PRO Manual

The operating instructions for the Propella 9S PRO can be found on the manufacturer’s website. Please visit the manufacturer’s website to access the manual.

Conclusion

Overall Assessment

After exploring the common problems, specifications, features, and user reviews of the Propella 9S PRO electric bike, it’s evident that this model offers a compelling blend of performance, design, and functionality.

Positive Aspects

The positive user reviews highlight the superior parts and components, smooth operation, reasonable price, efficient build, high build quality, impressive ride quality, and good braking power of the Propella 9S PRO. These aspects contribute to its popularity among urban commuters.

Negative Aspects

While there are some concerns expressed by users regarding the lack of a throttle, the conspicuous battery design, and suggestions for improvement in cable routing and chain quality, these negative aspects appear to be minor compared to the overall satisfaction with the bike.

Conclusion

In conclusion, the Propella 9S PRO electric bike emerges as a standout option for urban commuting, offering a balance of performance, style, and affordability. Despite a few minor drawbacks, the majority of users are satisfied with its features and functionality. Whether you’re navigating city streets or cruising through the urban landscape, the Propella 9S PRO proves to be a reliable and enjoyable companion for riders of all levels.

Propella 9S PRO FAQ