Which central motor to choose for a cargo bike? Complete guide to the best motors

Electric cargo bikes are designed to carry heavy loads: children, shopping, professional equipment… Unlike a traditional e-bike, it faces much higher stresses.

👉 Result: the choice of motor for cargo bike is crucial.

A poor motor can lead to:

• a lack of power when climbing
• excessive battery consumption
• premature wear of the bike

Conversely, a good motorisation ensures:

• smooth assistance even when loaded
• better range
• increased safety

The essential criteria for choosing a cargo bike motor

Before comparing the best motors, it is important to understand thekey criteria.

1. Motor torque (Nm): criterion no. 1

The motor torque determines the ability to start and to climb hills with a load.

👉 Recommendations for a cargo bike:

• 60 Nm minimum → light use
• 75–85 Nm → versatile use
• 85 Nm and above → heavy loads / hilly terrain

💡 Concrete example:

A parent transporting 2 children + bag (≈ 40–60 kg) will need at least75 Nmto remain comfortable.

2. The type of motor (mid-drive vs hub)

👉 Mid-drive motor (crank)= recommended

• Better weight distribution
• More efficient uphill
• More natural to use

👉 Hub motor= to be avoided for a heavy cargo if torque and motor are low-powered.

• Less effective under load
• Less stable

3. The management of assistance

A good cargo motor must offer:

• progressive assistance
• good start management
• immediate responsiveness

👉 Essential for starting at a traffic light with weight.

4. Reliability and after-sales service

A cargo bike is often used daily.

👉 It is important to prioritise:

• recognised brands
• a repair network
• available parts
• 
  

The best mid-drive motors for cargo bikes (detailed comparison)

Bosch Cargo Line: the essential reference

👉 Torque: up to 85 Nm

The Bosch Cargo Line motor is specifically designed for cargo bikes.

✔️ Advantages:

• High power even when loaded
• Easier starting
• Specific “Cargo” mode
• Exceptional reliability

❌ Disadvantages:

• High price

💡 Concrete example:

Ideal for a parent in the city with children or an urban delivery person.

Shimano EP8 Cargo: natural and efficient

👉 Torque: 85 Nm

Shimano offers a very pleasant motorisation.

✔️ Advantages:

• Natural pedalling
• Good effort management
• Quiet

❌ Disadvantages:

• Less 'brutal' than Bosch

💡 Example:

Perfect for comfortable daily commutes.

Our adapters for Shimano motors

Your Shimano motor is broken? Don't panic: we offer adapters to replace a faulty Shimano motor.

Discover

Yamaha PW-X3: power and responsiveness

👉 Torque: 85 Nm

Yamaha is known for its dynamic motors.

✔️ Advantages:

• Very responsive at start-up
• Ideal for climbing
• Good reliability

❌ Disadvantages:

• Slightly more aggressive

💡 Example:

Perfect for hilly terrain or heavy loads.

Brose: comfort and silence

👉 Torque: up to 90 Nm

✔️ Advantages:

• Very quiet
• Smooth assistance
• Exceptional comfort

❌ Disadvantages:

• Less common in cargo

💡 Example:

Ideal for long distances with moderate loads.

Our adapter for Brose motors

Your the Brose motor is broken? No problem: we have an adapter to replace it on your bike or electric cargo.

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Valeo Cyclee: innovation and extreme power

👉 Torque: up to 130 Nm

✔️ Advantages:

• Integrated automatic gearbox
• Very powerful
• Simplifies driving

❌ Disadvantages:

• High price
• Rarely used

💡 Example:

Perfect for intensive professional use.

Bafang: economical solution

👉 Torque: up to 120+ Nm depending on models

✔️ Advantages:

• Affordable price
• Good power
• Repairable

❌ Disadvantages:

• Less smooth
• Less reliable in the long term

💡 Example:

Suitable for limited budget or conversion.

Tongsheng: economical and DIY solution

For light urban use (children, shopping), the recommended choice is the TSDZ2 for several reasons:

• Sufficient for up to ~80 kg of load
• Natural assistance
• Consumes less

💡 Concrete example:

A parent with 1 child + bag → TSDZ2 is more than sufficient.

For a heavy cargo and professional use, the recommended choice is the TSDZ8 because:

• High torque (up to 140 Nm)
• Better on climbs
• Supports heavy loads

💡 Concrete example:

Delivery or 2 children + equipment → TSDZ8 much more suitable.

DIY conversion (key criterion)

👉 TSDZ2 = best choice

• Easier to install
• Well documented
• Compatible with open source firmware

👉 TSDZ8:

• more powerful
• but newer → less feedback

Which motor to choose according to your use?

Transporting children in the city

👉 Recommended: Bosch Cargo Line or Shimano EP8

• Safe start
• Smooth ride
• Reliability

Delivery or professional use

👉 Recommended: Bosch Cargo Line or Valeo but Shimano is widely used

• Maximum power
• Robustness
• Intensive use

Hilly or mountainous terrain

👉 Recommended: Yamaha or Bosch

• High torque
• Responsiveness

Limited budget

👉 Recommended: Tongsheng or Bafang

• Good power/price compromise

Long distance comfort

👉 Recommended: Brose

• Silence
• Smoothness

⚠️ Mistakes to avoid

❌ Choosing a motor that is too weak

❌ Opting for a rear wheel motor

❌ Neglecting customer service

❌ Relying solely on price

Conclusion: what is the best crank motor for a cargo bike?

👉 The best central crank motor for cargo bike depends on your use:

• City / family → Bosch or Shimano
• Professional → Bosch or Valeo
• Mountain → Yamaha
• Budget → Bafang

💡 But one thing is certain:

👉 a powerful motor (75–85 Nm minimum) is essential for a cargo bike.