Tongsheng TSDZ2B: Full Review
The Tongsheng TSDZ2B, alongside the TSDZ8, is one of only two mainstream mid-drive motors Tongsheng still lists in its official catalog. 80 N·m, 3.6 kg, and a voltage range (24/36/48 V) wider than any other model in the range — from 306 €.
Verdict at a glance
The most completely documented motor in Tongsheng's lineup: every value on the spec sheet comes straight from the manufacturer, with no gray area. The trade-off is more modest torque (80 N·m) than the TSDZ8 or TSDZ16 — plenty in the city, tighter on hills or under heavy load.
✓ Pros
- Fully official spec sheet (tongsheng-e.com), no missing data
- The lightest in the range we track: 3.6 kg
- Compatible with 24 V, 36 V and 48 V — the widest range of any of the four motors
- IP65 rated, universal 68 to 75 mm bottom bracket
✕ Cons
- Torque capped at 80 N·m, versus 90 to 160 N·m for the TSDZ8 and TSDZ16
- Less suited to cargo bikes or significant elevation gain
- Open-source firmware support not confirmed with the same maturity as the original TSDZ2
Who it's for
Urban riding or moderate touring, where light weight and a fully verifiable spec sheet matter more than peak torque.
Skip it if…
You're converting a cargo bike or targeting sustained mountain climbs: the TSDZ8 offers up to 140 N·m for the same entry price.
Spec sheet
| Rated power | 250 / 350 / 500 W |
|---|---|
| Maximum torque | 80 N·m |
| Voltage | 24 V / 36 V / 48 V |
| Sensor | Vitesse + couple |
| Water resistance (IP) | IP65 |
| Bottom bracket | 68 à 75 mm |
| Weight | 3,6 kg |
A spec sheet drawn entirely from Tongsheng's official documentation (tongsheng-e.com), checked on July 27, 2026 — the TSDZ2B is one of only two models in our selection carrying no unconfirmed reseller data at all.
Our scores by criterion
Our full grid is detailed in our rating system.
Compatibility is the TSDZ2B's strong suit: three supported voltages and a bottom bracket accepted up to 75 mm, the most permissive range in the lineup we track.
Against its alternatives
| Tongsheng TSDZ2B | Tongsheng TSDZ8 | Tongsheng TSDZ2 | |
|---|---|---|---|
| List price | 306 € | 336 € | 306 € |
| Year | 2023 | 2024 | 2018 |
| Rated power | 250 / 350 / 500 W | 500 / 750 W | 250 à 500 W (36 V) ou 350 à 750 W (48 V) selon configuration |
| Maximum torque | 80 N·m | 90 / 120 / 140 N·m selon configuration | — |
| Voltage | 24 V / 36 V / 48 V | 36 V / 48 V | 36 V / 48 V |
| Sensor | Vitesse + couple | Vitesse + couple | Couple + cadence |
| Water resistance (IP) | IP65 | IP65 | — |
| Bottom bracket | 68 à 75 mm | 68 ou 73 mm | 68 à 73 mm (norme JIS) |
| Weight | 3,6 kg | 4,8 kg | 3,6 kg |
The TSDZ8 nearly doubles available torque for the same entry price — a rational choice if power comes first. The original TSDZ2, meanwhile, remains the open-source firmware reference, at the cost of a far less complete spec sheet.
Our method
These figures come entirely from Tongsheng's official spec sheet. → Our full method
Frequently asked questions
Is the TSDZ2B powerful enough for a cargo bike or steep hills?
That’s the model’s limit. With 80 N·m official — versus 90 to 140 N·m for the TSDZ8 — the TSDZ2B suits urban riding or moderate touring. For cargo or significant elevation gain, the TSDZ8 or TSDZ16 offer a more comfortable margin.
Does the TSDZ2B run on 24 V?
Yes, that’s a distinctive feature: Tongsheng’s official spec sheet lists 24 V, 36 V and 48 V, the widest range among the four motors we track. Still, check your battery and controller compatibility before buying.
What’s the difference between the TSDZ2 and the TSDZ2B?
The TSDZ2B adds a dual-clutch system that reduces pedaling resistance when the motor is off, and a sensor integrated into the housing rather than bolted on afterward. It’s the model Tongsheng currently lists in its official catalog; the original TSDZ2 no longer appears there.
Does the TSDZ2B have open-source firmware?
The most active open firmware project (TSDZ2-Smart-EBike) was developed for the original TSDZ2’s sensor. The TSDZ2B shares a similar architecture, but we found no confirmation of support as mature as the TSDZ2’s — check case by case depending on your controller version.
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