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Tongsheng TSDZ2 Review: An In-Depth Look

Transforming a regular bike into an e-bike can be an exciting project, especially with a Tongsheng TSDZ2 conversion kit. This review delves into the pros and cons of this cost-effective solution compared to purchasing a new e-bike.

My experience includes over thirty installations of these kits. Their long-term reliability is comparable to other e-bike kits, such as the Bafang mid-drive. Read more about the Bafang review.

How the TSDZ2 Functions

The TSDZ2 is a mid-drive motor, replacing your bike’s bottom bracket. It pulls power from a battery, propelling the rear wheel through the bike’s chain. The motor’s torque sensor gauges your pedaling force, adjusting the electric assist accordingly. It’s like getting a helpful push while climbing a steep hill, making challenging gradients feel much easier.

You can select from four pedal assist levels: ECO, TOUR, SPEED, TURBO, customizing the ride to your needs and terrain. The torque sensor’s sensitivity ensures you get just the right amount of help.

Variants of Tongsheng Motors

The TSDZ2 comes in six configurations: 36v 250w / 350w / 500w and 48v 350w / 500w / 750w. Despite these options, all motors share the same internal components and electronics. The difference lies in the firmware programming of the controllers. For instance, a 48v 500w is essentially a 36v 250w motor with different firmware.

In 2022, Tongsheng introduced the TSDZ2B, boasting improvements like a dual clutch system in the motor, significantly reducing drag when the motor is inactive. This version also resolves previous issues with the blue gear and sprag clutch.

Legality of the TSDZ2

The TSDZ2’s legality varies. All models comply with the EN15194 European safety standard. The legal parameters hinge on the continuous power rating (250w) and maximum assisted speed (25 km/h). Although, most Bosch and Shimano e-bikes peak at higher outputs in their maximum settings.

Check local laws before installation. The unrestricted TSDZ2 can reach speeds as fast as your pedaling can handle. A typical setup with a 42t chainring can achieve a top assisted speed of 25 mph at 80 rpm. For more on UK Electric Bike Law, see my detailed article.

Compatibility and Installation

Not all bikes are compatible with the TSDZ2. It fits bicycles with a BSA threaded bottom bracket (68mm-73mm). Modern mountain bikes or road bikes with pressfit bottom brackets or MTB boost rear hub spacing may not be suitable.

Installation can be intricate, requiring mechanical skills. It’s advisable to seek professional help if you’re not confident. The kit includes the motor unit, LCD display, wiring loom, lock-nuts, chainring, speed sensor, bolts, screws, and a spanner.

Programming and Customization

Yes, it’s possible to program the TSDZ2 using OpenSource software and an ST-Link V2 debugger/programmer. Programming can enhance motor efficiency, pedal assist response, and reliability.

Common Issues with the TSDZ2

While generally reliable, the TSDZ2 has some known issues like the blue nylon gear wearing out, torque sensor failures, controller overheating, and susceptibility to water ingress. The latest TSDZ2B model addresses many of these problems.

TSDZ2 vs Bosch

Comparing TSDZ2 to the high-end Bosch motor reveals significant differences. Bosch motors are smoother and more refined, with renowned reliability. However, the TSDZ2 is a cost-effective alternative, and programming can enhance its performance.

Alternatives to TSDZ2

The Bafang mid-drive motor is a notable alternative. Though similar, it differs in key aspects like using a cadence sensor and being quieter yet heavier. For a detailed comparison, read my Bafang vs Tongsheng article.

TSDZ2 Kit Contents and Best Display Options

The kit includes a motor unit, LCD display (VLCD5/XH18/VLCD6), wiring loom, lock-nuts, 42T chainring, speed sensor, bolts, screws, and a spanner. The best display depends on your preference, with options ranging from the discreet VLCD6 to the more functional XH18.

Riding Experience and Suitability

The TSDZ2 offers an enjoyable riding experience with its torque sensing pedal assist. It’s best suited for those who prefer natural-feeling assistance and don’t mind putting in some effort. For those seeking more effortless performance, the Bafang BBS02B might be a better choice.

Conclusion

The TSDZ2 is an excellent choice for an e-bike conversion, offering good value and efficiency. However, it’s not ideal for everyone, given its installation complexity and maintenance needs. It’s a great alternative to Bafang, with a robust supply of spare parts available.

For purchasing options, the Tongsheng TSDZ2 is widely available online. Aliexpress usually offers the best prices, but for easier returns, consider Amazon or eBay.

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