The eBike Torque Calculator helps you estimate your motor’s real-world torque at both the motor shaft and the rear wheel.
Torque determines how powerful your bike feels during acceleration, hill climbing, and low-speed pulling. This calculator works for hub motors and mid-drives.
How the eBike Torque Calculation Works
Torque depends on several factors:
- Motor KV: Lower Kv motors produce more torque.
- Gear ratio: Mid-drive motors multiply torque using gears.
- Wheel diameter: Smaller wheels increase torque at the ground.
- Motor power & voltage: More wattage → higher torque potential.
- Total load: Heavy riders require higher torque.
Typical Real-World Torque Values
- 250W hub motor: 30–45 Nm
- 500W hub motor: 45–60 Nm
- 750W hub motor: 60–75 Nm
- Mid-drive (BBS02/BBSHD): 120–160 Nm
- Premium mid-drive (Bosch/Yamaha): 65–90 Nm
Tip: Torque is not the same as power. Torque gives acceleration; power gives top speed.
Frequently Asked Questions
Q: Does a lower Kv motor produce more torque?
A: Yes. Lower Kv means lower RPM per volt, which increases torque output.
Q: Why do mid-drive motors have so much more torque?
A: Because they use gears to multiply torque, unlike hub motors which have a fixed ratio.
Q: Does wheel size affect torque?
A: Yes. Smaller wheels increase torque and hill-climbing capability.
Q: How does rider weight affect torque?
A: More load requires more torque for the same acceleration.
Q: Is higher torque better?
A: Higher torque improves hill climbing and acceleration but may reduce top speed depending on Kv.
