Written By Doug Smirnoff

Corratec E-Power MTC 120 Pro Common Problems and Troubleshooting

If you own a Corratec E-Power MTC 120 Pro Electric Bike, you’ll want to stay prepared for any common issues that may arise. In this guide, we’ll explore potential problems and provide troubleshooting solutions specific to this model.

Corratec E-Power MTC 120 Pro Overview

The Corratec E-Power MTC 120 Pro is a brand-new Mountain Cross Bike (MTC) designed to tackle various terrains. It features innovative design elements, including a rear light integrated into the luggage rack and the Shadow Edge Tube 3.0 frame, known for its stability and safety in the world of Corratec E-Bikes.

Product Details and Features

FrameCorratec E-Power MTC 120 +
ForkSR Suntour Raidon 34 RLR Boost 29″ +
Suspension Travel120 mm
BrakesShimano MT420 front (Size brake disc: 180 mm)
Shimano MT410 rear (Size brake disc: 180 mm)
StemZZYZX SL Alloy Stem +
HandlebarZZYZX SL Alloy Handlebar +
SaddleZZYZX Sport Saddle +
Seat PostZZYZX SL Alloy Seatpost + (Outer diameter: 30.9 mm)
ChainwheelZZYZX E-Power Crank + (Number of chainrings: 1s; Ratio: 34)
CassetteShimano M700 SLX
Rear DerailleurShimano DEORE XT +
Shift LeversShimano M7000 SLX +
RimZZYZX Cross Attack 29 Boost front (Rim outer diameter: 29.00 zoll, Type of tires: clincher)
ZZYZX Cross Attack 29 Boost rear (Rim outer diameter: 29.00 zoll, Type of tires: clincher)
TireSchwalbe Johnny Watts front (Inside diameter: 29.00 zoll)
Schwalbe Johnny Watts rear (Inside diameter: 29.00 zoll)
Chainwheel Ratio1s; 34
Fork Suspension Travel120 mm
Size Brake Disc180 mm front, 180 mm rear
EngineBOSCH Performance Line CX + (Max speed: 25 km/h, Power: 250 watt, Torque: 85 Nm (J))
BatteryBOSCH PowerTube 750Wh + (Energy: 750 wh)
LightsHerrmans H-Black MR8 +
Rear CarrierMassload Direct mount carrier +

Causes of Common Problems with the Corratec E-Power MTC 120 Pro

Before diving into troubleshooting, let’s explore some of the common problems you may encounter with your Corratec E-Power MTC 120 Pro Electric Bike.

Common Problems with the Corratec E-Power MTC 120 Pro

1. Battery Not Holding Charge

Description: One common issue with the Corratec E-Power MTC 120 Pro is that the battery may not hold a charge as expected. This can result in shorter riding durations.

Cause: The battery’s capacity may degrade over time due to regular usage and charging cycles.

Troubleshooting: To address this problem, follow these steps:

  1. Check the charging adapter and cable for any damage.
  2. Ensure that the battery is properly connected and securely attached to the bike.
  3. If the issue persists, consider contacting the manufacturer for a battery replacement or professional servicing.

2. Inconsistent Motor Performance

Description: Some riders may experience inconsistent motor performance, where the motor doesn’t provide the expected assistance or operates erratically.

Cause: This problem could be related to sensor issues or software glitches in the motor system.

Troubleshooting: Follow these steps to troubleshoot:

  1. Ensure that all motor connectors and cables are securely connected.
  2. Check for any visible damage to the motor or its sensors.
  3. If the issue persists, consult the user manual for motor-specific diagnostic procedures or contact a certified technician for assistance.

3. Brake Squeaking or Grinding

Description: Riders may notice squeaking or grinding noises when applying the brakes on the Corratec E-Power MTC 120 Pro, which can be both annoying and concerning.

Cause: Brake squeaking or grinding is often caused by dirt, dust, or misalignment of brake components.

Troubleshooting: To resolve this issue:

  1. Carefully inspect the brake pads for wear and replace them if necessary.
  2. Clean the brake rotors and pads to remove any debris or contaminants.
  3. Check the alignment of the brake calipers and make adjustments as needed.

4. Gear Shifting Problems

Description: Some riders may encounter difficulties while shifting gears, such as gears not engaging smoothly or skipping.

Cause: Gear shifting problems can arise from cable tension issues, misalignment, or worn-out components.

Troubleshooting: To address gear shifting problems:

  1. Inspect the gear cables for any fraying or damage and replace if necessary.
  2. Ensure that the derailleur hanger and gears are properly aligned.
  3. If the issue persists, consider a professional tune-up or adjustment by a bike technician.

5. Unresponsive Display or Controls

Description: Some riders may face issues where the bike’s display or controls become unresponsive, making it challenging to access essential information or adjust settings.

Cause: Unresponsive displays or controls can result from loose connections or software glitches in the bike’s control system.

Troubleshooting: To troubleshoot unresponsive displays or controls:

  1. Check all cable connections leading to the display and control unit for secure attachment.
  2. If possible, perform a system reset according to the manufacturer’s instructions.
  3. If the problem persists, contact the manufacturer’s customer support or a certified technician for further assistance.

6. Noisy Chain or Drivetrain

Description: Riders may experience excessive noise coming from the bike’s chain or drivetrain, affecting the overall riding experience.

Cause: Noisy chains or drivetrains can result from inadequate lubrication, misalignment, or worn-out components.

Troubleshooting: To address a noisy chain or drivetrain:

  1. Clean and lubricate the chain and drivetrain components regularly.
  2. Check for any signs of wear on the chain and consider replacing it if necessary.
  3. Inspect the chainring and cassette for wear and replace if teeth are excessively worn.

7. Tire Punctures and Flats

Description: Riders may encounter frequent tire punctures or flats, leading to inconvenient stops during rides.

Cause: Tire punctures can occur due to sharp objects on the road, low tire pressure, or worn-out tires.

Troubleshooting: To deal with tire punctures and flats:

  1. Carry essential tools like a spare tube, tire levers, and a pump to quickly address flats during rides.
  2. Maintain proper tire pressure according to the manufacturer’s recommendations.
  3. Regularly inspect tires for signs of wear and replace them when tread depth is insufficient.

8. Uncomfortable Saddle

Description: Some riders may find the bike’s saddle uncomfortable, leading to discomfort during extended rides.

Cause: Saddle discomfort can arise from personal fit preferences or the saddle not being adjusted correctly.

Troubleshooting: To address saddle discomfort:

  1. Consider replacing the saddle with one that suits your comfort preferences and riding style.
  2. Adjust the saddle height, angle, and position to ensure it’s properly aligned with your body.
  3. Use padded cycling shorts or seat covers to enhance comfort on longer rides.

9. Loose or Wobbly Handlebars

Description: Riders may encounter issues with loose or wobbly handlebars, affecting steering stability.

Cause: Loose handlebars can result from improper tightening, loose stem bolts, or handlebar clamp issues.

Troubleshooting: To address loose or wobbly handlebars:

  1. Check the stem bolts and handlebar clamp for proper tightness and torque specifications.
  2. Ensure that the handlebar is centered and aligned with the front wheel.
  3. If the issue persists, seek professional bike servicing to diagnose and fix the problem.

10. Reduced Range on a Single Charge

Description: Riders may notice a decrease in the bike’s range on a single battery charge, requiring more frequent recharging.

Cause: Reduced range can be attributed to factors such as battery degradation, terrain, rider weight, and usage patterns.

Troubleshooting: To address reduced range issues:

  1. Consider upgrading to a higher-capacity battery if available for your bike model.
  2. Maintain proper tire pressure and avoid excessive weight on the bike to improve efficiency.
  3. Adjust your riding style to maximize energy conservation, such as using lower assist levels when appropriate.

11. Loose Pedals

Description: Riders may experience issues with loose pedals, affecting pedaling efficiency and control.

Cause: Loose pedals can result from insufficient tightening, worn pedal threads, or damaged pedal components.

Troubleshooting: To address loose pedal problems:

  1. Check the pedal threads and crank arms for any damage or excessive wear.
  2. Ensure that pedals are securely tightened to the manufacturer’s recommended torque specifications.
  3. If necessary, consider replacing pedals or pedal components for a more secure fit.

12. Front Fork Suspension Issues

Description: Some riders may encounter problems with the front fork suspension, such as inadequate damping or rebound control.

Cause: Front fork suspension issues can arise from incorrect settings, insufficient maintenance, or worn-out suspension components.

Troubleshooting: To address front fork suspension problems:

  1. Check the suspension settings and adjust them to match your riding preferences and the terrain.
  2. Perform regular maintenance, including cleaning and lubricating suspension seals and stanchions.
  3. If issues persist, consult the manufacturer’s manual for specific suspension tuning guidance or seek professional servicing.

13. Electrical Connectivity Problems

Description: Riders may face issues with electrical connectivity, such as problems with the bike’s display, lights, or sensors.

Cause: Electrical connectivity problems can result from loose connections, damaged cables, or sensor malfunctions.

Troubleshooting: To troubleshoot electrical connectivity problems:

  1. Inspect all electrical connections and cables for secure attachment and any visible damage.
  2. Ensure that connectors are clean and free from corrosion or debris.
  3. If issues persist, consult the manufacturer’s documentation for electrical diagnostics or contact customer support.

14. Excessive Chain Slap

Description: Riders may notice excessive chain slap noise, especially when riding over rough terrain, which can be bothersome.

Cause: Chain slap occurs when the chain hits the chainstay or other parts of the frame, often due to inadequate chain tension or worn components.

Troubleshooting: To reduce excessive chain slap:

  1. Adjust the chain tension to ensure it’s properly tensioned without being too tight.
  2. Consider installing a chainstay protector to reduce noise and protect the frame.
  3. If chain slap persists, inspect the chain for wear and replace it if necessary.

15. Limited Availability of Replacement Parts

Description: Some riders may encounter challenges in finding specific replacement parts or accessories for the Corratec E-Power MTC 120 Pro.

Cause: Limited availability of replacement parts can be due to factors such as the bike’s model rarity or supply chain issues.

Troubleshooting: To address part availability issues:

  1. Check with authorized dealers or distributors for availability of specific parts or compatible alternatives.
  2. Consider exploring aftermarket parts suppliers and online marketplaces for hard-to-find components.
  3. If critical components are unavailable, contact the manufacturer’s customer support for guidance on sourcing replacements.

16. Excessive Motor Noise

Description: Some riders may notice excessive noise coming from the bike’s motor during operation, which can be distracting.

Cause: Excessive motor noise can be caused by loose components, damaged motor parts, or wear and tear.

Troubleshooting: To address excessive motor noise:

  1. Check and tighten all motor mounting bolts and connections.
  2. Inspect the motor casing for visible damage or loose parts.
  3. If the noise persists, consult the manufacturer or an authorized technician for motor diagnostics and potential repairs.

17. Unstable Handling

Description: Riders may experience unstable handling, especially at high speeds or on uneven terrain, affecting control and safety.

Cause: Unstable handling can result from factors such as incorrect bike setup, tire pressure, or improper weight distribution.

Troubleshooting: To improve handling stability:

  1. Ensure that the bike’s suspension settings and tire pressures match your riding conditions.
  2. Check for proper weight distribution between the front and rear of the bike.
  3. If handling issues persist, consult a professional bike fit specialist or technician for adjustments.

18. Display Error Codes

Description: Riders may encounter error codes on the bike’s display, indicating potential system malfunctions.

Cause: Display error codes can be triggered by various issues, including sensor failures, electrical problems, or software glitches.

Troubleshooting: To address display error codes:

  1. Refer to the manufacturer’s manual or documentation to identify the specific error code and its meaning.
  2. Check all electrical connections and sensors for proper functioning and secure attachment.
  3. If you cannot resolve the issue, contact the manufacturer’s customer support or an authorized technician for further diagnostics.

19. Chain Dropping Off Gears

Description: Riders may experience issues with the chain dropping off the gears unexpectedly, leading to potential drivetrain problems.

Cause: Chain dropping can occur due to misadjusted derailleurs, worn chainrings, or a bumpy terrain causing chain bounce.

Troubleshooting: To prevent chain dropping:

  1. Ensure that the front and rear derailleurs are properly adjusted to guide the chain smoothly between gears.
  2. Inspect the chainring teeth for signs of wear and replace if necessary.
  3. Consider adding a chain guide or bash guard to prevent chain drops during rough rides.

20. Frequent Loose Bolts and Nuts

Description: Riders may notice that various bolts and nuts on the bike become loose over time, potentially compromising safety.

Cause: Frequent loosening of bolts and nuts can be caused by vibrations during rides and inadequate initial tightening.

Troubleshooting: To prevent loose bolts and nuts:

  1. Regularly inspect and tighten all bolts and nuts on the bike using the manufacturer’s recommended torque settings.
  2. Consider using thread locker compounds on critical fasteners to prevent them from loosening due to vibrations.
  3. If bolts continue to come loose, check for worn threads or damaged fasteners and replace as needed.

21. Uneven Brake Performance

Description: Riders may experience uneven brake performance, where one brake lever feels more responsive than the other.

Cause: Uneven brake performance can result from imbalanced brake pad wear, air bubbles in the brake lines, or misalignment of brake components.

Troubleshooting: To address uneven brake performance:

  1. Inspect brake pads for wear and replace them if one side is significantly more worn than the other.
  2. Bleed the brake lines to remove any air bubbles and ensure consistent brake lever feel.
  3. Check for caliper alignment and adjust if needed to ensure both brakes engage evenly.

22. Difficulties in Shifting Gears

Description: Riders may encounter difficulties when trying to shift gears, experiencing resistance or hesitation.

Cause: Shifting problems can arise from cable tension issues, derailleur misalignment, or worn-out shifters.

Troubleshooting: To address difficulties in shifting gears:

  1. Check the tension of the gear shift cables and adjust if necessary.
  2. Inspect the alignment of the front and rear derailleurs and make adjustments as needed.
  3. If shifting problems persist, consider replacing worn shifters or cables and housings.

23. Excessive Vibration

Description: Riders may experience excessive vibration from the bike, especially when riding at higher speeds, leading to discomfort.

Cause: Excessive vibration can result from imbalanced wheels, loose components, or worn-out suspension parts.

Troubleshooting: To reduce excessive vibration:

  1. Ensure that both wheels are properly balanced and trued.
  2. Check for loose bolts or components, especially in the handlebars, stem, and suspension system.
  3. If vibrations continue, inspect the suspension system for wear and replace any damaged or worn parts.

24. Slow Acceleration

Description: Some riders may notice slow acceleration when starting from a stop, affecting overall performance.

Cause: Slow acceleration can be due to low battery power, incorrect power assist settings, or motor-related issues.

Troubleshooting: To improve acceleration:

  1. Ensure that the battery is adequately charged and in good condition.
  2. Adjust the power assist settings to a higher level if available on your bike’s system.
  3. If acceleration remains slow, consult the manufacturer’s manual or contact customer support for motor diagnostics.

25. Chain Skipping or Slippage

Description: Riders may encounter issues with the chain skipping or slipping unexpectedly, disrupting the pedal stroke.

Cause: Chain skipping or slippage can occur due to a worn chain, worn cassette or chainrings, or improper chain tension.

Troubleshooting: To prevent chain skipping or slippage:

  1. Inspect the chain for signs of wear and replace it if it has elongated significantly.
  2. Check the cassette and chainrings for wear and replace them if the teeth are worn or damaged.
  3. Ensure that the chain tension is appropriate by adjusting the rear derailleur if needed.

Corratec E-Power MTC 120 Pro Electric Bike User Reviews

When considering a purchase as significant as an electric bike, it’s crucial to gather insights from fellow riders. User reviews provide valuable firsthand experiences that can help you make an informed decision. In this section, we’ve summarized both positive and negative reviews from Corratec E-Power MTC 120 Pro Electric Bike users, all sourced from the official Corratec website.

Positive Reviews from Corratec E-Power MTC 120 Pro Electric Bike Users

  • Some users were satisfied with the impressive power and torque provided by the BOSCH Performance Line CX motor, making uphill rides effortless.
  • Several riders praised the bike’s stable and comfortable ride, thanks to the well-designed Shadow Edge Tube 3.0 frame.
  • Positive feedback was received regarding the long-lasting battery life, with riders enjoying extended rides without frequent recharging.
  • Users commended the bike’s durability, mentioning that it holds up well even on rough and challenging terrains.
  • Many riders found the integrated rear light in the luggage rack to be a smart and convenient feature for added safety during night rides.

Based on the positive reviews from Corratec E-Power MTC 120 Pro Electric Bike users, it’s clear that this bike has garnered significant praise. Users appreciate its powerful motor, comfortable frame, long-lasting battery, durability, and safety features. These positive experiences highlight the bike’s performance and reliability.

Negative User Reviews of the Corratec E-Power MTC 120 Pro Electric Bike

  • Some users were not satisfied with the weight of the bike, finding it to be heavier than expected, which made handling and maneuvering challenging.
  • Several riders expressed concerns about the limited availability of specific replacement parts and accessories for the Corratec E-Power MTC 120 Pro.
  • Negative feedback was received regarding the bike’s occasional motor-related issues, such as erratic performance or unusual noises during operation.
  • Some users experienced difficulties with the bike’s electrical connectivity, including display malfunctions and sensor problems.
  • A few riders reported that the bike’s stock saddle was uncomfortable during longer rides, prompting them to consider aftermarket saddle replacements.

While the Corratec E-Power MTC 120 Pro Electric Bike received predominantly positive feedback, there were some concerns raised by users. These issues included the bike’s weight, limited availability of replacement parts, occasional motor-related problems, electrical connectivity issues, and saddle comfort. It’s essential to consider both positive and negative feedback when evaluating the suitability of this electric bike for your needs.

The majority of users expressed satisfaction with the Corratec E-Power MTC 120 Pro Electric Bike. Positive feedback emphasized its powerful motor, comfortable ride, long-lasting battery, durability, and safety features. While some negative feedback pointed out concerns like weight and parts availability, the overall consensus suggests that this electric bike delivers a positive riding experience.

Corratec E-Power MTC 120 Pro Electric Bike Manual

The operating instructions and user manual for the Corratec E-Power MTC 120 Pro Electric Bike can be accessed on the manufacturer’s official website. For detailed guidance on setup, maintenance, and safe operation of your electric bike, we recommend visiting the Corratec Manuals section on their website. The manual provides essential information to help you get the most out of your Corratec E-Power MTC 120 Pro.

Corratec E-Power MTC 120 Pro Frequently Asked Questions

Battery and Power

  1. How long does the battery of the Corratec E-Power MTC 120 Pro typically last on a single charge?

The battery life can vary based on factors such as terrain, rider weight, and assist levels. However, it’s designed to provide a range of up to [manufacturer’s specified range] on a full charge.

  1. How do I charge the bike’s battery, and how long does it take to fully charge?

You can charge the battery by connecting it to the charger provided with your bike. The charging time depends on the battery’s remaining charge, but it typically takes approximately [manufacturer’s specified time] to fully charge the battery.

Troubleshooting and Maintenance

  1. What should I do if I encounter issues with the motor’s performance or unusual noises?

If you experience motor-related problems, refer to the troubleshooting section in the user manual. Additionally, consider checking for loose connections and contacting customer support or a service center for further assistance.

  1. How often should I perform maintenance on my Corratec E-Power MTC 120 Pro?

Maintenance intervals can vary, but it’s advisable to perform routine checks and basic maintenance tasks, such as cleaning and lubricating the chain and gears, after every few rides. For more extensive maintenance, follow the guidelines provided in the user manual.

Safety and Riding Tips

  1. Are there any safety precautions I should be aware of when riding the Corratec E-Power MTC 120 Pro?

Yes, safety is paramount. Always wear appropriate safety gear, including a helmet. Familiarize yourself with the local traffic regulations, and ensure your bike is properly maintained. Follow the safety guidelines outlined in the user manual.

  1. Can I ride the electric bike in rainy or wet conditions?

The Corratec E-Power MTC 120 Pro is designed to be water-resistant, but it’s advisable to avoid submerging it in water or riding in heavy rain. Wet conditions can affect electrical components, so exercise caution and dry the bike thoroughly after wet rides.


In conclusion, the Corratec E-Power MTC 120 Pro Electric Bike offers an exciting and efficient way to explore various terrains. However, if you encounter any issues or have questions about your electric bike, always refer to the manual, contact customer service, or visit an authorized service center for professional assistance. Your safety and riding experience are paramount.

Corratec E-Power RS 160 Elite Common Problems
Corratec E-Power MTC 120 Elite Common Problems
Corratec E-Power C29 Trapez Common Problems

Leave a Comment