描述
A hub motor pushes the bicycle from behind, which is why it always feels like a stranger riding along. A mid-drive motor works through the chain, through the gears, and through the same drivetrain the rider already trusts. The Tongsheng TSDZ series was built around that idea, and the result is an electric bicycle that still feels like a bicycle. Power arrives when the pedals load, not when a throttle is twisted, so the assist reads as your own legs finding a second wind.
The torque sensor is the whole argument. It measures how hard you are pushing the cranks and scales the motor output to match, which means a gentle spin at the end of a ride and a hard stand on a climb both produce the response you would expect from your own effort. Zero-start capability adds power from a dead stop without a throttle, so junctions and stop-start traffic stop being a negotiation. The 2025 revision moved the gear positioning for better sealing and a longer service life, and the IPX5 rating keeps the unit working through rain and road spray.
Three power tiers cover most riders and most laws. The 48V 750W version is the workhorse for cargo bikes, long climbs and heavy riders. The 500W option sits in the middle for mixed use. The 36V 250W version is the road-legal specification for the European market, quiet and efficient on flat commutes. Bottom brackets from 68mm to 73mm are supported, disc brakes and V-brakes both work, and the supplied mounting hardware fits the large majority of standard frames without frame modification.
Choose the display that matches how you ride: the SW2-M58 with its clear instrument layout, or the EKD01 with Bluetooth for tuning assist curves from a phone. Brake levers or brake sensors are selected at checkout so the motor cuts cleanly the moment you touch the brakes.
Assist should feel like a tailwind, never like a tow rope.
Key Features
- ✦ Torque sensor reads pedal pressure and scales assist in real time for a natural riding feel
- ✦ Zero-start capability delivers power from a complete standstill without a throttle
- ✦ 2025 revision with revised gear positioning for improved sealing and longer service life
- ✦ IPX5 water resistance for reliable operation in rain and road spray
- ✦ Bottom bracket compatibility from 68mm to 73mm, fitting roughly 95 percent of standard bicycle frames
- ✦ Disc brake and V-brake compatible, with a choice of brake lever or brake sensor cut-off
Technical Specifications
- Motor Type: Mid-drive, brushless, side-hung design
- Rated Power Options: 48V 750W / 36V 250W / 500W configuration
- Voltage: 48V or 36V depending on version
- Sensor: Torque sensor (PAS)
- Bottom Bracket: 68mm to 73mm length, 33.5mm to 36mm diameter
- Chainring: 44T for 750W version, 42T for 250W version
- Display Options: SW2-M58 instrument display or EKD01 with Bluetooth
- Waterproof Grade: IPX5
- Brake Compatibility: Disc brake or V-brake, brake lever or brake sensor
- Design: Brushless, side-hung motor
- Certification: CE
- Warranty: 12 months
Where It Belongs
This kit is for the rider who has a bicycle worth keeping and does not want to replace it with a scooter. Commuters use the 250W version to flatten a hilly route without turning the bike into a moped. Cargo and touring riders pick the 750W version because torque delivered through the gears multiplies against the load instead of fighting it. Small workshops and rental fleets fit the kit across a mixed stable of frames, since the 68mm to 73mm bottom bracket range and the standard mounting pattern remove the guesswork from the install.
Frequently Asked Questions
Q: Will this fit my bicycle frame?
The kit supports bottom brackets from 68mm to 73mm in length and 33.5mm to 36mm in diameter, which covers roughly 95 percent of standard frames. If your frame uses a press-fit or unusually wide bottom bracket, message us with the frame model before ordering.
Q: What is the difference between the 750W, 500W and 250W versions?
The 48V 750W version delivers the most torque and suits cargo bikes, heavy riders and long climbs. The 36V 250W version is the road-legal European specification, quieter and more efficient. The 500W option sits between them for general mixed use.
Q: Does the motor work without pedalling?
There is no throttle. Assist is driven by the torque sensor and delivered through the pedals, and the zero-start function supplies power from a standstill so you can set off from a stop without strain. This is what keeps the ride feeling like a bicycle.
Q: Which display should I choose?
The SW2-M58 gives a clear, glove-friendly instrument layout with speed, assist level, battery state and trip data. The EKD01 adds Bluetooth so you can adjust the assist curve from a phone, which is the better choice if you ride the same route with and without cargo.
Q: How does the motor behave when I brake?
Order with brake levers or brake sensors and the controller cuts motor output the instant the brake is applied. Both options are available at checkout, and the correct one depends on whether you are replacing your existing levers.
Q: Is the kit waterproof enough for daily commuting?
The unit carries an IPX5 water resistance rating, so rain and road spray are not a problem. Do not submerge the motor or jet-wash it at close range, and the bearings will last far longer.
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