BAFANG M325/M625 Series Mid Drive Ebike Conversion Kit Instruction Manual

Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your BAFANG M325/M625 Series Mid Drive Ebike Conversion Kit. Please read this manual thoroughly before installation and use to ensure proper function and safety.

The BAFANG M325/M625 series motors are designed to convert standard bicycles into electric bikes, offering enhanced power and control for various terrains, including mountain, road, city, and fat tire bikes. These kits feature advanced technology for a smoother, more comfortable ride with gradual acceleration.

Safety Precautions

Always wear a helmet and appropriate safety gear when riding an ebike.
Ensure all components are securely fastened before each ride.
Do not operate the ebike in heavy rain or immerse the motor in water.
Familiarize yourself with local ebike regulations and laws.
Perform regular checks on brakes, tires, and electrical connections.
Keep hands and clothing clear of moving parts during operation.

Person riding a bicycle in the rain with a 'no rain' symbol — Figure 1: Avoid riding the ebike in heavy rain to prevent damage to electrical components.

Compatibility Check

Before installation, verify your bicycle's compatibility with the BAFANG mid-drive kit. The kit is designed to fit most mountain, commute, and road bikes, but specific measurements are crucial.

Motor Compatibility

Confirm the bottom bracket (BB) size of your bike. The motor fits BB sizes with a diameter of 34-36mm (1.34"-1.42") and a length of 68-73mm (2.68"-2.87") or 85-105mm (3.35"-4.13").

Bottom Bracket Length: 68-73mm.
Bottom Bracket Diameter: 34-36mm.
Speed Sensor Spacing: Ensure sufficient space for the speed sensor, typically less than 4mm from the magnet.

Diagram showing bottom bracket dimensions and speed sensor placement for BAFANG motor compatibility — Figure 2: Key dimensions for motor compatibility, including bottom bracket length (A), diameter (B), and speed sensor spacing (C).

Detailed diagram showing how to measure bottom bracket length and diameter for motor fit — Figure 3: Visual guide for checking bottom bracket dimensions and sprocket clearance.

Incompatible Bike Types

The BAFANG mid-drive kit is not compatible with the following bicycle types:

Belt drive bikes.
Coaster brake bikes.
Bikes with bottom bracket inner diameter outside 33.5-36mm.

Images showing incompatible bike features: narrow bottom bracket, belt drive, and coaster brake — Figure 4: Examples of bicycle conditions not suitable for BAFANG BBS motors.

Battery Compatibility

The updated M325 motor removes communication protocol restrictions, allowing compatibility with various battery brands. For downtube batteries, ensure sufficient frame space using a cutout template. For rear rack batteries, check for installation screw holes on your rear fork and measure the rear fork size (typically 150-160mm).

Images demonstrating how to check downtube battery fit using a template — Figure 5: Checking downtube battery compatibility with a cutout template.

Images showing how to check rear rack battery compatibility by inspecting screw holes and measuring fork width — Figure 6: Verifying rear rack battery fitment on the bicycle frame.

Setup and Installation

The BAFANG ebike conversion kit is designed for straightforward installation. Refer to the included installation video and manual for detailed steps. Below is an overview of the components and general installation points.

What's in the Box (Packing List)

Diagram showing all components included in the BAFANG M625 packing list, including motor, display, cables, and tools — Figure 7: Comprehensive packing list for the BAFANG M625 kit, detailing all included parts.

Image showing the BAFANG mid drive motor and various accessories in the kit — Figure 8: Components of the BAFANG Mid Drive Kit.

Image showing an ebike kit with battery, motor, and other accessories — Figure 9: Ebike kit with battery and accessories.

General Installation Steps

Prepare the Bicycle: Remove the existing bottom bracket, crankset, and chain.
Install the Motor: Mount the BAFANG mid-drive motor into the bottom bracket shell. Secure it using the provided hoop design for stability.
Install Crankset and Chainring: Attach the new crankset and chainring to the motor.
Mount Display and Controls: Install the display, throttle, and brake levers/sensors on the handlebars.
Connect Wiring: Connect all electrical components (motor, battery, display, throttle, brake sensors, speed sensor, lights) using the 1T4 cable and extension cords. Ensure connections are secure and waterproof.
Install Speed Sensor: Mount the speed sensor on the rear chainstay and align the magnet on a spoke.
Install Battery: Securely mount the battery (downtube or rear rack) to the bicycle frame.
Final Checks: Double-check all connections, ensure cables are neatly routed and secured, and test all functions before riding.

Diagram illustrating the installation points of various components of the ebike conversion kit on a bicycle — Figure 10: Overview of component installation points on a bicycle.

Brake Lever or Brake Sensor

The kit typically includes default brake levers. If your bike's existing brake system is incompatible (e.g., shift-integrated brake handles or hydraulic disc brakes that cannot be replaced), contact support for a brake sensor option.

Images showing compatible brake types (mechanical disc, rim V-brake) and incompatible types (shift-integrated, hydraulic disc) for the default brake levers — Figure 11: Brake compatibility guide for the conversion kit.

Operating Instructions

Riding Modes

The BAFANG ebike conversion kit offers four primary riding modes:

E-bike Mode: Pure electric power, controlled by the throttle.
Pedal Assisted Mode (PAS): Motor provides assistance as you pedal. The level of assistance can be adjusted via the display.
Walk Assist Mode: Provides low-speed motor assistance for walking the bike.
Pure Pedal Bicycle: Motor assistance is off, and the bike functions as a standard bicycle.

The motor features a moderate acceleration program, ensuring a smooth and gradual increase in speed and power, which is ideal for new riders while still providing robust performance for climbing.

Digital Display Usage

The optional digital display provides essential information and allows control over riding modes and settings. Common features include speed, battery level, assist level, and trip distance. Some displays offer advanced features like navigation and smartphone app connectivity.

BAFANG DPC010 display showing speed, battery, and time — Figure 12: BAFANG DPC010 Digital Display interface.

BAFANG DPC080 display showing speed, battery, and assist level — Figure 13: BAFANG DPC080 Digital Display interface.

EKD01 display showing speed, battery, and assist level with smartphone app integration — Figure 14: EKD01 Display with smartphone app connectivity.

VD61 display showing speed, battery, and assist level with smartphone app integration — Figure 15: VD61 Display with smartphone app connectivity.

VD03 display showing speed, battery, and assist level — Figure 16: VD03 Display interface.

VD618 display showing speed, battery, and assist level — Figure 17: VD618 Display interface.

Maintenance

Regular maintenance ensures the longevity and optimal performance of your BAFANG ebike conversion kit.

Cleaning: Clean the motor and battery with a damp cloth. Avoid high-pressure washing directly on electrical components.
Connections: Periodically check all electrical connections for tightness and corrosion.
Battery Care:
- Charge the battery regularly, even when not in use, to maintain its health.
- Store the battery in a cool, dry place.
- Avoid fully discharging the battery frequently.
Mechanical Parts: Lubricate the chain and check brake pads and tire pressure regularly, as you would with a standard bicycle.
Professional Inspection: Consider having your ebike inspected by a qualified technician annually.

Technician performing maintenance on an ebike motor — Figure 18: Regular professional inspection is recommended.

Troubleshooting

This section addresses common issues you might encounter. For more complex problems, please contact customer support.

Problem	Possible Cause	Solution
Motor not providing assistance.	Battery low or disconnected; display off; assist level set to zero; loose motor connection.	Check battery charge and connection; turn on display; increase assist level; inspect motor wiring.
Display not turning on.	Battery low or disconnected; loose display cable.	Ensure battery is charged and connected; check display cable connection.
Brakes not engaging properly.	Worn brake pads; loose brake cables; brake sensor issue.	Inspect and replace brake pads; adjust brake cables; if using brake sensors, ensure they are correctly installed and functioning. If default brake levers are incompatible, contact support for brake sensors.
Unusual noises from motor.	Loose components; foreign object; internal motor issue.	Check for loose bolts or debris; if noise persists, contact support.

Specifications

Motor Specifications (M325 vs. M625)

Feature	M325 (500W)	M625 (750W)	M625 (1000W)
Motor Model	M325	M625	M625
Power	500W	750W	1000W
Voltage	48V	48V	52V
Controller Current	18A	24A	28A
Efficiency	>80%	>80%	>80%
Max Torque	100 N.m	140 N.m	160 N.m
Maximum Speed	30-40 km/h	45-50 km/h	50-55 km/h
Net Motor Weight	Approx. 4.24 kg	Approx. 4.24 kg	Approx. 5.0 kg
Bottom Bracket Length	68-73mm or 85-105mm	68-73mm or 85-105mm	68-73mm or 85-105mm
Material	Magnesium alloy	Magnesium alloy	Magnesium alloy
Surface Treatment	Powder spraying process	Powder spraying process	Powder spraying process
Loading Method	Hoop structure	Hoop structure	Hoop structure

Comparison table of BAFANG M325 and M625 motor specifications including power, torque, and speed — Figure 19: Detailed comparison of M325 and M625 motor specifications.

Table comparing M325 and M625 motor specifications including power, voltage, torque, and weight — Figure 20: Another view of M325 and M625 motor specifications.

Battery Specifications

Battery Type	Voltage/Capacity	Watt-hours (Wh)	Battery Cell	BMS Max Discharge Current	USB Port	Weight	Cycle Life
Shark Battery	36V 15.6Ah	561.6Wh	18650 2600mAh	30A	USB	3.9kg	1000 times
Shark Battery	48V 13Ah	624Wh	18650 2600mAh	30A	USB	4.25kg	1000 times
Shark Battery	48V 16Ah	768Wh	18650 3200mAh	30A	USB	4.23kg	1000 times
G80 Shark Battery	48V 19.2Ah	921.6Wh	L*G 21700 4800mAh	30A	USB	4.95kg	1000 times
G80 Shark Battery	48V 20Ah	960Wh	Sam*sung 21700 5000mAh	30A	USB	4.7kg	1000 times
Downtube YingWu Battery	52V 20Ah	1040Wh	Sam*sung 21700 5000mAh	30A	USB/Type-C	5kg	1000 times
Rear Rack Battery	48V 17.5Ah	840Wh	18650 2600mAh	30A	None	6kg	1000 times
VoltzX Battery	48V 20Ah	960Wh	Sam*sung 21700 5000mAh	30A	USB	5.2kg	1000 times

Table detailing specifications for various BAFANG ebike batteries, including voltage, capacity, cell type, and weight — Figure 21: Specifications for various compatible ebike batteries.

Display Specifications

Model	Screen Size	Holder (mm)	PAS Level	Advanced Password	Navigation	Automatic Headlight	USB Charger
EKD01	2.4" TFT	22.2/25.4	3/5/9	2020	Yes	No	Type-C
DPC010.CB	4" TFT	22.2	0-3 / 0-5	1919	Yes	Yes	Type-C
DPC080.C	1.9" IPS	22.2	5	1919	Yes	Yes	Type-C
VD03	1.5" IPS	22.2	3/5/9	N/A	No	No	No
VD618	3.5" OLED	22.2	3/5/9	1919	No	Yes	Type-C
P860ML	3.5" LCD	22.2	3/5/9	1919	No	Yes	USB-A

Table comparing various BAFANG ebike displays, including screen size, PAS levels, and features like navigation and USB charging — Figure 23: Specifications for various optional ebike displays.

Warranty Information

The BAFANG Mid Drive Ebike Conversion Kit comes with the following warranty:

Returns: 30 Days return policy.
Repair/Replacement: 365 days repair or replacement coverage.
Technical Guidance: Lifetime technical guidance is provided.

Please retain your proof of purchase for warranty claims.

Customer Support

For any questions, technical assistance, or warranty claims, please contact our customer support team.

Email: ga_sale_service@163.com
Online Resources: Refer to the product page for additional guides and videos.

Customer service representative with a headset — Figure 25: Contact customer support for assistance.

	Bafang Bottom Bracket Measurement Guide for BBS02/BBSHD E-bike Mid-Drives Download and print this Bafang measurement guide to accurately determine your bicycle's bottom bracket diameter, shell thickness, and width. Essential for ensuring proper fitment of Bafang BBS02 (750W) and BBSHD (1000W) mid-drive motors. Includes printable template and instructions.
	BAFANG Hub Motor System User Manual - Installation Guide Comprehensive user manual for BAFANG hub motor systems, detailing installation steps, tools required, wiring diagrams, and technical specifications for electric bike conversion.
	BAFANG BBS01/BBS02 Mid-Drive E-bike Motor Installation Manual \| eMax eBikes Comprehensive installation manual for the BAFANG BBS01 and BBS02 mid-drive electric bike motor kits. Includes technical specifications, assembly steps, wiring diagrams, and warranty information from eMax eBikes.
	BAFANG BBS01/BBS02 Mid-Drive Electric Bike Conversion Kit Installation Manual Detailed installation guide for BAFANG BBS01 and BBS02 mid-drive electric bike conversion kits. Covers system overview, technical specifications, step-by-step assembly, component connections, and warranty information for e-bike DIY enthusiasts.
	BAFANG M510 Mid Motor User Manual and Installation Guide Comprehensive user manual for the BAFANG M510 Mid Motor, covering specifications, installation procedures, maintenance, and troubleshooting for electric bicycles.
	Bafang Mid-Drive Ebike Programming Guide: Enhance Performance Learn how to reprogram your Bafang mid-drive ebike system for improved usability and performance. This comprehensive guide covers necessary hardware, software, configuration tool instructions, and detailed explanations of all settings for Bafang BBS02 and BBSHD motors.