The world of e-bikes is evolving rapidly, and mid-drive motors are at the forefront of this revolution. These powerful motors, positioned centrally within the bike frame, offer superior performance and handling compared to their hub-motor counterparts. Today, we’re focusing on two leading mid-drive options: the Tongsheng TSDZ8 and the Bafang BBS02B, both packing a 48V 750W punch.
Tongsheng and Bafang are major players in the e-bike motor industry, offering a wide range of conversion kits to electrify your ride. The TSDZ8 and BBS02B are their flagship mid-drive offerings, designed for speed and performance. While both kits share similarities, they also have distinct characteristics that cater to different riding styles and preferences.
Ride Experience & Motor Performance
We recently put the TSDZ8 through its paces on a scenic ride. The first thing we noticed was how incredibly quiet it was, with only the gentle hum of our tires breaking the silence. The bike felt agile and responsive, handling corners and climbs with ease. Even when we dialed the assist level up to the max, the power delivery remained smooth and controlled, only surging forward when we really pushed the pedals.
In contrast, the BBS02B is a beast of a motor, known for its raw power and lightning-fast acceleration. It’s a bit louder than the TSDZ8, but that’s a small price to pay for the adrenaline rush it delivers. However, the BBS02B’s cadence sensor results in a more on-off power delivery, requiring more frequent gear changes to maintain optimal pedaling efficiency.
Tongsheng TSDZ8 & Bafang BBS02B Mid-Drive Motor Kits Specifications
| Feature | TSDZ8 (48V 750W) | BBS02B (48V 750W) |
|---|---|---|
| Brand | Tongsheng | Bafang |
| Category | Speed Pedelec (S-Pedelec) | Speed Pedelec (S-Pedelec) |
| Sensor | Torque sensor (more natural and responsive feel) | Cadence sensor (on/off feel) |
| Max Speed | 45-55 km/h | 50-55 km/h |
| Max Torque | >120 Nm | 120 Nm |
| Size | Larger | Smaller |
| Weight | 3.6 kg | 4.3 kg |
| Ease of Maintenance | Easier to disassemble and repair | Less easy to disassemble and repair |
| Battery Connector | XT60 | Bullet connector |
| Structure | Aluminum alloy | Aluminum alloy |
| Waterproofing | IP54 (protected against water spray) | IPX5 (protected against low-pressure water jets) |
| Noise | Quiet | Slightly louder |
| Customization | Highly customizable due to active open-source community | Limited customization options |
| Bottom Bracket Size | 68/73mm | 68/73mm |
| Price | Generally less expensive | Generally more expensive |
Unboxing & Component Details: Quality with a Few Quirks
Unboxing both the TSDZ8 and BBS02B reveals a commitment to quality, with well-built components and robust construction evident in both kits. The TSDZ8 stands out with its variety of display options, catering to both budget-conscious riders and those seeking premium features. However, it’s worth noting that the TSDZ8’s chain line can be a bit finicky, sometimes requiring a specially designed chainring for optimal performance. Similarly, the BBS02B’s cables may be on the shorter side for some frames, so be sure to double-check compatibility before installation.
| Packing Lists | Tongsheng TSDZ8 | Bafang BBS02B |
|---|---|---|
| Motor | 750W | 750W |
| Battery | Optional | Optional |
| Display | Optional | Optional |
| Throttle | ✔ | ✔ |
| Brake lever | ✔ | ✔ |
| Crank | ✔ | ✔ |
| Chain wheel | ✔ | ✔ |
| Speed Sensor | ✔ | ✔ |
| Lock Nut | ✔ | ✔ |
| 1T4 cable | ✔ | ✔ |
| Battery cable | ✔ | ✔ |
Inside The Motors: A Battle Of Brains & Brawn
The TSDZ8’s larger controller and superior heat dissipation could translate to better long-term performance and reliability compared to the BBS02B. On the flip side, the BBS02B’s controller is known for its ruggedness and superior waterproofing, making it a solid choice for riders who frequently encounter wet conditions. When it comes to internal components, the BBS02B generally takes the lead with higher overall quality, but the TSDZ8’s larger bearings and anti-vibration ring are noteworthy features that contribute to a smoother and more durable ride.
Additionally, the TSDZ8 benefits from a thriving open-source community, offering a wealth of knowledge, support, and customization options. While the BBS02B community is also passionate and helpful, it doesn’t quite match the breadth and depth of the TSDZ8’s community-driven resources.
| TSDZ8 (48V 750W) | BBS02B (48V 750W) | |
|---|---|---|
| Pros | Responsive torque sensor
Smooth power delivery Quiet operation Open-source community Easier maintenance More affordable |
Powerful acceleration
Robust, waterproof controller High-quality internal components Established brand Variety of accessories |
| Cons | Chain line and cable length issues
Internal component quality Controller waterproofing |
On/off power delivery
Louder operation Less customizable More expensive |
Torque Sensor vs. Cadence Sensor: A Matter of Feel
One of the most significant differences between these two motors is how they sense your input. The TSDZ8 boasts a torque sensor, which measures how hard you’re pushing on the pedals. This results in a more natural and intuitive riding experience, as the motor’s assistance perfectly matches your effort. The harder you pedal, the more power the motor provides.
On the other hand, the BBS02B relies on a cadence sensor, which only detects whether you’re pedaling and how fast. This can lead to a slightly jerky power delivery, as the motor abruptly kicks in and out as you start and stop pedaling.
Software & Usability: Open-Source Flexibility vs. Tried-and-True Reliability
The TSDZ8 we tested was running on older software, but we’re eager to upgrade to the latest Tongsheng firmware, which promises to refine and balance the lower assist levels. Even with the older software, the torque sensor made the TSDZ8 feel more intuitive and responsive compared to the BBS02B’s cadence-based system.
Customization is everything in the e-bike world, and the TSDZ8’s open-source community is a game-changer. With a plethora of custom firmware options available, you can fine-tune your riding experience to perfection. The BBS02B has a solid community as well, but it doesn’t quite match the TSDZ8’s level of flexibility.
TSDZ8 or BBS02B: The Choice is Yours
In the battle of the mid-drives, both the TSDZ8 and BBS02B are worthy contenders. The TSDZ8 excels with its smooth power delivery, responsive torque sensor, and passionate community. The BBS02B is a tried-and-true powerhouse that delivers an adrenaline-fueled ride.
Ultimately, the best motor for you comes down to your individual needs and preferences. If you prioritize smooth power, customization, and community support, the TSDZ8 might be your ideal match. If you crave raw power and a simpler setup, the BBS02B could be your perfect partner.
