PEXMOR Electric Bicycle User Manual

Safety Information

⚠️ Warning!

• Install and adjust this bicycle ONLY in accordance with these instructions. Read them completely prior to installation and use. Contact customer service if any point is unclear.
• ALWAYS obey all applicable local and national laws and regulations while riding. Do not ride this bicycle in any area prohibited to electric bicycles. Always wear your helmet and other required protective gear. Always maintain your reflectors and other required safety equipment.
• Check whether the brakes function well using the brake levers before riding. Even after power is cut to the motorized wheel, the inertia of the bike will often require active braking power.
• ALWAYS ensure all fasteners and components are intact and securely tightened before and after every use.
• DO NOT ride this bicycle if any part is damaged or malfunctions. Repair or replace worn and broken parts before further use.
• Pay attention to the remaining power before setting out and during use. Recharge your battery as needed to ensure it never runs out of power at a moment where you are taken by surprise.
• DO NOT allow children or persons unfamiliar with these instructions to operate this bicycle without strict supervision.
• DO NOT wear loose footwear or clothing that may become caught in the wheels or any other moving parts.
• It is recommended that you not ride your bike fast when getting started. This can be ensured by setting the bike's maximum speed limit low until you are fully familiar with your new electric bike and its controls.
• ALWAYS be alert for people, animals, or any obstacles that may appear in front of you while riding your bicycle. Be aware that pedestrians and drivers may not expect the speed or responsiveness of your bike. Adjust your behavior accordingly. It is advisable to install warning devices to draw their attention, but always be ready to turn safely out of their way if needed. Do not focus on the LCD display for extended periods of time while riding.
• NEVER ride at a speed where your stopping distance exceeds your visibility. We do not recommend that you ride your bicycle at night or in an environment with poor visibility. If you have an emergency that makes it necessary to do so, keep your light on and limit your speed appropriately.
• DO NOT get the battery, its charger, or its power cord wet or operate them with wet hands.
• NEVER use the pedal assist system (PAS) or timed shutoff in any situation, road condition, or terrain where doing so might impair your control of your bicycle.
• NEVER adjust 03, 06, or 07 on the LCD display panel. Adjustment of these parameters should only be made when using the display with other compatible motorized wheels of differing voltage, diameter, or magnet arrangements. In any other case, any adjustment of these parameters should be undone immediately and the original settings restored before any further use of this bicycle.
• Disconnect the battery from this bicycle before any cleaning, servicing, and storage.

Specifications

Parts List

Product Diagram

BICYCLE Components:

• Main frame
• Saddle
• Seat post
• Battery
• Rear wheel
• Cassette
• Motor
• Derailleur
• Chain
• Chainwheel
• Crank
• Pedal
• Handle bar
• Front light
• Front fork
• Front wheel
• Disc Brake

HANDLE BAR Components:

• Brake Lever
• LCD display
• Phone holder
• Rear gear shifter
• Front light button
• Horn button
• Throttle

Assembly Video Links

The following sections refer to videos for assembly guidance. Please scan the QR codes in the original document to access these videos:

• Assembly Video
• Use of Display Video
• Charging Video
• Folding Video

Assembly Instructions

1. Rotate the front fork 180 degrees

Turn the front fork 180 degrees to the left or right side. Ensure the stem is perpendicular to the front fork shoulder.

2. Take the steel rod out

Use a 13mm wrench to loosen the two screws at both ends of the steel rod at the bottom of the front fork, then remove the steel rod.

3. Installing the front wheel

(1) Loosen each nut on the axle of the front wheel.

(2) Attach the front wheel to the front fork. Center the front wheel on the front fork leg, place the washer and screws on both ends of the hub in sequence. Tighten the screws with a 15mm wrench in a clockwise direction.

4. Installing the front brake

Use a 4mm hex wrench to loosen the two screws on the left side of the fork. Ensure the disc is in the middle of the brake, then use the two screws to tighten the disc brake in place.

5. Installing the handlebar

Use a 5mm hex wrench to unscrew the top bolt and remove the cap from the stem of the handlebar.

6. Calibrate the disc brake position

After installing the disc brake, check if the disc plate is centered within the brake caliper. If not, loosen the screws, adjust the disc brake position until the disc is centered, and then retighten the screws.

7. Installing the headlight

Remove the washer and screw behind the fork crown using a 10mm wrench. Insert the headlight bracket and then use a 4mm hex wrench and a 10mm wrench to tighten the washer and screw.

8. Installing the Pedals

(1) Attach the pedals to the crank arms on the appropriate side, screwing them into place. Note: The two pedals (D) are different and should NOT be mixed up. The right pedal is marked with an 'R' and the left with an 'L'.

(2) Tighten their locking nuts with your 15mm wrench.

9. Installing the rear reflector

Use a Phillips screwdriver to tighten the screws on the reflector. Ensure it is tightly installed on the seat tube.

10. Installing the Seat

Instructions for installing the seat.

11. Installing the front reflector

Instructions for installing the front reflector.

12. Installing the mobile phone support

Use a 3mm hex wrench to install the screws on the phone support.

13. Inflating the Tires

1. Remove the valve cap on a wheel.
2. Connect the valve to an appropriate pump.
3. Inflate the tire until it feels firm. For best results, stop inflation when the pressure reaches 25 psi (1.68 bars).
4. Disconnect your pump from the wheel, replacing the valve cap immediately.
5. Inflate the other tire following the same steps.

Maintenance

Charging the Battery

You can see the remaining power on the battery's LED power display and the top left of the LCD display panel. When recharging is necessary:

1. Unlock the battery by inserting the key and turning counterclockwise.
2. Remove the battery from the bicycle.
3. Connect the charger (H) to a stable compatible power source.
4. Connect the battery to the charger using the provided power cord (I). The battery's power indicator light should turn red and charging should begin.
5. When the light turns green, the battery has been fully charged. Disconnect the charger first from your power source and then remove the battery from the charger.

Miscellaneous Maintenance

• Disconnect the power after each use and prior to any cleaning or other maintenance.
• Check the parts of the bicycle for any looseness, wear, or damage after use. Tighten, repair, or replace any problematic parts before further use.
• The exterior of the bicycle can be cleaned with a soft damp cloth. Do not use abrasive or caustic chemicals.
• Lubricate the chain and any moving part using a standard bike lubricant as needed.
• If the bicycle will not be used for an extended period of time, store in a cool dry place inaccessible to children.

Battery Maintenance Warm Tips

Correct Charging Method:

• After receiving the electric bike, charge the battery first. Start riding after fully charging.
• Connect the plugs at both ends of the charger to the battery first, and then to the power supply.
• If the green light is displayed after the charger is connected for the first time, it may indicate that the power supply is not connected properly. Try reconnecting; a red light indicates normal charging.
• The battery should be charged on the day after it is exhausted during the ride.
• Make sure to fully charge the battery every 3 months, even in case of infrequent use.

LCD Instrument Use Instructions

Please read the operation manual in detail before using the LCD Instrument. This manual will guide you to use the instrument correctly to achieve a variety of vehicle control and vehicle status display functions.

1. Function overview and functional area layout

1.1 Function overview

Display YL81C provides a variety of functions to meet riding needs, including:

• Battery level indicator
• Assist level adjustment and indication (e.g., 0-3, 1-3, 0-5, 1-5)
• Speed indicator
• Walk boost mode
• Distance indicator (including trip distance and ODO)
• Error code indicator
• Personalized parameter settings (e.g., wheel diameter, speed limit, etc.)
• Factory default parameter recovery function

1.2 Functional area layout

The display shows speed, distance, and assist levels. Key indicators include Speed indicator, Distance indicator, Assist level indicator, and units (km/h, MPH, km, mile).

1.3 Button definitions

There are three buttons on the operating unit of display YL81C: the on/off button, plus button (+), and minus button (-).

2. General operation

2.1 Power on/off

Press and hold the power button to turn on the display and controller. Press and hold the power button again to turn off the e-bike. The display automatically powers off after 10 minutes of inactivity.

2.2 Display interface

After power-on, the display shows real-time speed and trip distance by default. Pressing the mode button switches between trip distance and ODO (total distance). The TRIP light indicates trip distance is shown; the ODO light indicates total distance is shown.

2.3 Walk boost mode

Long press the mode button to enter walk boost mode, where the e-bike moves at 6km/h. Release the button to stop power output. This mode is for pushing the bicycle, not for riding.

2.4 Battery level indicator

The battery level is indicated by four segments. All segments on mean fully charged. The last segment flashing indicates undervoltage, requiring immediate charging.

2.5 Error code indicator

When a fault occurs, the display shows an error code (e.g., E001). Detailed definitions of error codes are provided in the manual.

3. Personalized parameter settings

Settings must be done with the bicycle stationary. The procedure involves pressing and holding specific buttons to enter the setting interface, toggling between parameters, changing values, and saving.

3.1 Backlight luminance setting (01P)

Parameters 1, 2, and 3 set minimum, standard, and maximum backlight luminance, respectively.

3.2 Metric and Imperial setting (02P)

Set to 00 for metric (km/h, km) or 01 for imperial (MPH, mile).

3.3 Rated voltage setting (03P)

Adjustable rated voltage range: 24V, 36V, 48V, 60V.

3.4 Auto Sleep Time Setting (04P)

Sets auto-off time from 1 to 60 minutes; 00 disables auto-shutdown. Factory default is 10 minutes.

3.5 PAS level setting (05P)

Adjustable Pedal Assist System (PAS) levels, typically 0-3 or 1-3.

3.6 Wheel diameter setting (06P)

Adjustable wheel diameter range: 1-32 inches.

3.7 Number of speed sensor magnets setting (07P)

Adjustable range: 1-255 pcs. Factory default is 12.

3.8 Speed Limit Setting (08P)

Adjustable speed limit range: 1-100km/h. Maximum limit may vary by protocol.

3.9 Start-up setting (09P)

Choose start modes: 00 (zero start) or 01 (non-zero start).

3.10 Drive mode setting (10P)

Available modes: 00 (Pedal assist only), 01 (Electric only), 02 (Both Pedal assist and electric).

3.11 Pedal assist sensitivity setting (11P)

Adjustable range: 1-24. Higher numbers require more crank rotations to activate the motor.

3.12 Pedal assist strength setting (12P)

Adjustable range: 0-5. 0 is weakest, 5 is strongest pedal assist.

3.13 Number of pedal assist sensor magnets setting (13P)

Adjustable range: 5-12 pcs.

3.14 Controller Current Limit Setting (14P)

Adjustable range: 1-50A.

3.15 Battery under voltage value setting (15P)

Adjustable based on the current rated voltage.

3.16 ODO resets setting (16P)

Options: 00 (non-reset) or 01 (reset).

3.17 6km/h walk boost setting (17P)

Options: 00 (turn off walk boost) or 01 (turn on walk boost).

3.18 Power-on password setting

Allows setting a four-digit power-on password (PSd-y) or disabling it (PSd-n).

4. Shortcut operation

4.1 Restore factory default parameter settings

To restore defaults (dE-Y), enter the main setting interface, keep speed at 0, press and hold specific buttons for 2 seconds. The display will show dE-0 and then restore settings.

4.2 Trip odometer reset operation

Enter the main setting interface, keep speed at 0, press and hold specific buttons for 2 seconds to reset the trip odometer. The main interface will flash during reset.

Considerations

• Do not plug or unplug the display when it is powered on.
• Avoid bumping the display.
• Do not alter display parameter settings arbitrarily, as it may affect normal riding.
• If the display fails, it should be repaired promptly.
• Due to product upgrades, displayed content or functions may differ from the manual.

6. Error Code Definition

Bicycle Parts Warranty List

Note: The warranty covers natural wear, excluding man-made damage and irresistible causes. Provide broken sample parts, photos, and videos with Bike Numbers for claims.

FAQ and Suggest Solution

Battery cannot be charged normally / Battery indicator light is abnormal

Suggest Solution:

1. Confirm the charging method is correct: Connect charger plugs to battery first, then power supply. A green light on the charger may indicate a power supply issue if the battery isn't charging; try reconnecting. 3 green and 1 red light on the battery indicator is normal when fully charged.
2. If the battery still won't charge: Provide a video showing the charging process (battery, charger, and socket in a bright space) for seller assessment.

Charger and battery indicator status meaning:

• If charger indicator light is off: Try charging without the battery. If it remains off, the charger is damaged and needs replacement.
• If charger light is on but battery light is off: Measure battery voltage. For a 48V battery, normal charging voltage is 54.6-39V. If below 39V, the battery may not charge. It might need a charger that starts from 0V.

Fast battery drain

Suggest Solution:

• New bike voltage should be 54V when fully charged. 3 green and 1 red lights are normal after full charge. If the charger shows green, let it charge for another hour.
• Provide a video showing battery drain: Record kilometers at start of ride and after battery is exhausted. Battery voltage and cruising range relate to battery age.

Motor does not work/abnormal sound

Suggest Solution:

• First, check wiring. If wiring is normal, check the controller or handlebar.
• If abnormalities are found, provide a video to the seller and request replacement accessories.

PAS mode can't last

Suggest Solution:

Open the controller box and check the connection between the sensor and the controller for looseness or poor contact.

Gear Level cannot be adjusted

Suggest Solution:

The electric mountain bike has 3 riding modes:

• Throttle-only mode (motor): Switch display to Level 0, twist handlebar for motor power. Shift lever cannot be adjusted in this mode.
• Pedal-assist mode (pedal+motor): Switch levels via LCD display (1-5). Higher levels mean faster speed and more battery usage.
• Pedal-only mode (turn off display): Pedal and shift gears using the bike shifter (1-7).

Instrument display the error code

Suggest Solution:

When the instrument is abnormal and displays an error code, refer to the error code definitions to check for faulty parts.

Vehicle status code meaning

Refer to the error code table provided in the manual.

Instrument does not work

Suggest Solution:

• Situation 1: Battery is exhausted. Try charging the battery and turning it on again.
• Situation 2: Battery is charged but the instrument does not turn on. First, check for wiring issues. If wiring is fine, the instrument may be damaged and require replacement.

Instrument shows that the max speed cannot reach the initial value

Suggest Solution:

• Confirm the battery is fully charged.
• Check if the wheel diameter setting has been changed. Different wheel sizes (e.g., 26", 27.5", 28") affect speed readings.

Pedals fall off

Notice:

• The Right (R) and Left (L) pedals must be installed on the correct cranks (clockwise for right, counterclockwise for left).
• When installing for the first time, tighten pedals according to the installation video to prevent falling or damage.
• Regularly check pedals during riding. Tighten any loose pedals promptly to avoid damage.

Front fork is bent and the front wheel is out of alignment / Front wheel is unbalanced after installation

Suggest Solution:

Check the front fork installation direction. Rotate the front fork 180 degrees and straighten it before installation as per instructions (refer to P1 for correct installation direction).