Mid-drive e-bike kits place the motor near the crank, leveraging the bike’s gears for efficient climbing and balanced handling. This approach delivers natural pedal feel, stronger hill performance, and easier maintenance than some hub-drive options. The following five mid-drive kits from BAFANG and Varstrom represent popular, versatile upgrades for mountain, road, and city bikes. Each option fits common frames and bottom brackets, with a range of power levels, torque sensors, displays, and battery configurations. Use this guide to compare torque, installation, and ride feel to choose the best kit for your riding style and budget.
| Product | Brand | Power Options | BB Compatibility | Notable Feature |
|---|---|---|---|---|
| BAFANG Mid Drive Kit BBS02B/BBS-HD | BAFANG | 500W/750W/1000W | 68-73mm | Torque up to 160 N.m; top speed up to 45 km/h |
| BAFANG Mid Drive Motor Kit 750W/1000W/500W | BAFANG | 500W/750W/1000W | 68-73mm / 100mm / 120mm | CAN bus system; includes multiple display options |
| BAFANG 48V 750W Mid Drive Kit With 44T Chainring | BAFANG | 500W/750W | 68-73mm / 85-105mm / 105-125mm | 44T chainring; strong climbing power |
| Varstrom Tong-Sheng TSDZ2B TSDZ8 Mid Drive Kit | Varstrom | 500W/750W | 68-73mm | Torque sensor; IPX5 waterproof; up to 140 N.m |
| Varstrom 48V 500W/750W Mid Drive Kit | Varstrom | 500W/750W | 68-73mm | Torque sensor; easy plug-and-play setup |
BAFANG Mid Drive Kit BBS02B BBS-HD 750W-1000W
This Bafang mid-drive kit combines the BBS02B and BBS-HD options for a wide power range in a single package. It is designed to fit 68-73mm bottom brackets and accepts larger sizes for versatile applications. The kit includes most essential components, with optional battery and LCD display. It supports disc or V-brake systems and uses a crank-driven powertrain for efficient climbing and steady acceleration.
Performance is defined by torque options of 100, 120, and 160 N.m across the variants, enabling confident hill climbs and swift acceleration. Users can choose throttle, pedal assist, or conventional cycling modes to tailor power delivery. The kit is compatible with standard mountain, road, and city frames, though installation requires careful alignment of the chainring, bottom bracket, and derailleur area to ensure smooth shifting and braking performance.
- Complete accessories included or optional as needed
- Disc or V-brake compatibility; chain-driven design
- Top speed around 45 km/h depending on setup and local limits
BAFANG Mid Drive Motor Kit 750W/1000W/500W Ebike Conversion Kit
This upgraded Bafang mid-drive motor kit emphasizes smooth throttle response and versatile power. It is designed to fit a broad range of bikes by accommodating bottom brackets within 68-73mm, 85-105mm, and 105-125mm spaces. The CAN bus-driven system ensures stable communication between components, while three riding modes cover pedal assist, throttle, and standard cycling. A newer tail light connector and battery communication connector enhance integration with displays and power systems. The kit is intended for road, mountain, and hybrid bikes seeking reliable, controllable assistance.
Complete accessories are included to simplify installation, with an emphasis on compatibility for varied frame geometries. If you ride a recumbent or tricycle, extension cables are available to accommodate unusual frames. Expect strong hill-climbing performance and consistent acceleration across urban and rural terrains, with the option to add a dedicated display for ride analytics.
BAFANG 48V 750W Mid Drive Kit With Chainring 44T
This mid-drive kit centers on robust mid-motor performance with a 44T chainring, designed to upgrade bikes from commuters to light mountain architectures. The 48V system supports up to 750W and integrates with a display and throttle, delivering a responsive pedal-assist experience and comfortable cruising speed. The kit includes the essential components for installation, including the controller, brake lever, throttle, LCD display, battery, and charger, along with extension cables and redundant wiring for reliable operation with disc brakes.
Key advantages include a compact drive layout, better efficiency on varied terrains, and improved gear utilization thanks to the mid-drive location. It is compatible with disc brakes and standard chain-driven drivetrains, making it a practical upgrade for many existing bikes while maintaining a natural ride sensation when pedaling.
Varstrom Tong-Sheng TSDZ2B TSDZ8 Mid Drive Kit
The Varstrom Tong-Sheng kits feature mid-drive motors and a torque sensor for intuitive power delivery. The TSDZ2B and TSDZ8 variants offer up to 140 N.m of torque, enabling confident climbs and steady acceleration on mixed terrain. Built for 68-73mm BB width, these kits support road, mountain, hybrids, and even some tricycles with plug-and-play components. The IPX5-rated construction helps withstand rain and moisture, and most kits ship with pre-installed cables and clear installation guides. The torque sensor adjusts assist in real time, promoting a natural riding feel that mirrors conventional cycling.
Riders benefit from multiple riding modes, including e-bike, pedal assist, and walk assist. An LCD display tracks speed, distance, and battery life, helping riders manage energy and plan longer trips without guesswork. The kit’s balanced weight distribution improves handling during cornering and on inclines, a hallmark of mid-drive systems.
Varstrom 48V 500W/750W Mid Drive With Display & Battery (Optional)
Varstrom’s 48V mid-drive kits offer 500W and 750W configurations with an emphasis on torque sensor integration for a natural ride experience. The TSDZ2B and TSDZ8 motors power bikes by directly driving the chain, which improves gearing efficiency and overall ride feel on climbs and varying surface conditions. Compatibility centers on 68-73mm BB width, with plug-and-play components and straightforward wiring to facilitate installation on many mountain and city bikes.
The kit can be paired with an included display or a battery for extended range. Its mid-drive architecture allows efficient use of the bike’s gears, producing smoother power delivery and better hill performance than hub motors. It’s well-suited for riders who want a reliable, sensor-responsive system that complements pedaling effort.
Buying Guide
When choosing a mid-drive kit, consider the following factors to ensure the upgrade meets your needs and riding style.
- Power and torque: 500W, 750W, and 1000W options translate to different climbing capabilities and top speeds. Torque ranges from about 100–160 N.m depending on model; higher torque helps on steep grades but may demand stronger components.
- Bottom bracket compatibility: Most kits target 68-73mm widths, but some offer additional spacings (100mm, 120mm). Verify your bike’s BB width and spindle diameter before purchasing.
- Drivetrain compatibility: Mid-drive motors rely on your bike’s chain and gears. Ensure your drivetrain is chain-driven and that the motor’s power won’t overwhelm shifting components or derailleur limits.
- Brake system: Disc brakes are commonly supported. Some kits require disc-only or V-brake compatibility; confirm brake type and rotor clearance for your setup.
- Display and controls: Displays vary from simple trip meters to advanced analytics. Consider whether you want a throttle option, three pedal-assist modes, or walk-assist features for easier handling on hills.
- Battery integration: Some kits include optional batteries; others require you to source a compatible pack. Check voltage (36V, 48V, or 52V) and compatibility with the motor’s controller.
- Wiring and installation: Some kits are straightforward plug-and-play, while others require more extensive frame modification or cable management. A professional installation may be beneficial for complex frames.
- CAN bus and programming: CAN bus systems allow deeper customization but may require programming cables or software. If you want to adjust speed limits or throttle response, confirm supported interfaces.
- Water and weather resistance: IP ratings (like IPX5) indicate resistance to moisture. Consider protection if you ride in rain or humid conditions.
- Warranty and support: Check the manufacturer’s warranty terms and availability of replacement parts, cables, and displays for ongoing maintenance.
Choosing the right mid-drive kit involves balancing power, compatibility, and install effort against your riding goals. For riders prioritizing hill-climbing efficiency, a higher-torque, higher-wower system paired with a compatible battery is ideal. If you value a natural pedal feel and long-range cruising, a torque-sensor mid-drive with a well-matched display can provide that refined experience. Always verify frame compatibility and seek professional help if you’re unsure about installing the kit yourself.