TSDZ2B vs TSDZ8: Which One Should You Pick?
| Rating | Produit | Prix | |
|---|---|---|---|
| 8.4/10 |  Tongsheng TSDZ2BTongsheng | 306 € | |
| 8.5/10 |  Tongsheng TSDZ8Tongsheng | 336 € |
The TSDZ2B and TSDZ8 are, as of this writing, the only two mainstream mid-drive motors Tongsheng still lists in its official catalog. The manufacturer presents the second as an improved version of the first — here's what that means in practice.
The comparison table
| Tongsheng TSDZ2B | Tongsheng TSDZ8 | |
|---|---|---|
| Maximum torque (official) | 80 N·m | 90 / 120 / 140 N·m depending on configuration |
| Power | 250 / 350 / 500 W | 500 / 750 W |
| Voltage | 24 V / 36 V / 48 V | 36 V / 48 V |
| Bottom bracket | 68 to 75 mm | 68 or 73 mm |
| Weight | 3.6 kg | 4.8 kg |
| Gear ratio | 41 | 38 |
| Rotation speed | 100 rpm | 125 rpm |
| Water resistance | IP65 | IP65 |
| Sensor | Speed + torque | Speed + torque |
| Confirmed entry price | 306 € | 336 € |
Both spec sheets come entirely from Tongsheng's official documentation (tongsheng-e.com) — no reseller data was needed for this comparison.
What the table reveals
Torque is the gap that actually matters. The TSDZ2B caps at a single, modest value (80 N·m); the TSDZ8 climbs to 140 N·m depending on configuration — nearly double, for about 30 € more at entry price. In exchange, the TSDZ2B stays lighter (3.6 kg versus 4.8 kg) and supports an extra voltage (24 V), useful on some entry-level builds.
A simple rule of thumb. If you're unsure which torque level to pick, ask yourself one question: are you hauling heavy loads, or riding on notably hilly terrain? If yes, the TSDZ8. If not, the TSDZ2B is enough — and it's 1.2 kg lighter on the bike.
Why these are the only two genuinely comparable motors
Of the four Tongsheng motors we track, only the TSDZ2B and TSDZ8 have a spec sheet fully published by the manufacturer (tongsheng-e.com). The TSDZ16 and the original TSDZ2 rest on reseller data, harder to verify. Comparing the TSDZ2B and TSDZ8 means comparing two motors on equal footing: no documentary uncertainty skews the result — only the spec sheet decides.
It's also the most common comparison among buyers, since these are the only two models Tongsheng continues to actively produce and develop — firmware updates and new compatible displays target these two references first.
Full spec sheets
| Tongsheng TSDZ2B | Tongsheng TSDZ8 | |
|---|---|---|
| List price | 306 € | 336 € |
| Year | 2023 | 2024 |
| Rated power | 250 / 350 / 500 W | 500 / 750 W |
| Maximum torque | 80 N·m | 90 / 120 / 140 N·m selon configuration |
| Voltage | 24 V / 36 V / 48 V | 36 V / 48 V |
| Sensor | Vitesse + couple | Vitesse + couple |
| Water resistance (IP) | IP65 | IP65 |
| Bottom bracket | 68 à 75 mm | 68 ou 73 mm |
| Weight | 3,6 kg | 4,8 kg |
Our recommendation
Tongsheng TSDZ2B
80 N·m official, the lightest of the two, and a spec sheet fully documented by Tongsheng — plenty outside of heavy loads or significant elevation gain.
306 €
Tongsheng TSDZ8
Up to 140 N·m official, for cargo bikes or hilly terrain — about 30 € more than the TSDZ2B at entry price.
336 €
→ Our full TSDZ2B review · Our full TSDZ8 review · Which Tongsheng motor for your use case
Frequently asked questions
Is the TSDZ8 just a more powerful TSDZ2B?
That’s how Tongsheng officially describes it: "the Z8 motor, an improved version of the TSDZ-2B." Maximum torque goes from 80 N·m (a single value) to a range of 90 to 140 N·m depending on configuration.
Is the TSDZ2B enough for everyday city riding?
Yes, easily. 80 N·m comfortably covers urban riding or moderate touring. The TSDZ8’s extra torque only really pays off with significant elevation gain, heavy loads, or a cargo bike.
Is there a price difference between the two?
Yes, about 30 €: 306 € for the TSDZ2B versus 336 € for the TSDZ8 from specialist resellers. A modest gap given the torque gain (80 N·m versus up to 140 N·m).
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