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The technology behind the TQ HPR 120S

Specially designed for the demands of pedelecs and e-bikes, the high-performance TQ HPR 120S takes its engineering cues from the permanently excited direct-current motors used for the control of modern satellites. The motor's very densely wound core means losses are much lower than in comparable systems.

How the drive works

The electric machine drives an elliptical roller bearing. The oval contour moves 150 pins in a wave pattern between the inner gear (148 teeth) and the stationary external gear (152 teeth). The pins act as transmitters. Transmission takes place between the rotary motion of the bearing (input: motor) and the internal gear (output to the chain ring). All the pins are engaged around the entire circumference achieving power transmission that occurs in a minimum of installation space. The transmission gears down in only one stage with a ratio of 1:37. That is, at a pedaling frequency of 80 rpm, the electric machine is running at about 3000 rpm.

Thanks to the integrated freewheel, the bicycle can be pedaled just like a bike without a motor. When the drive is disengaged, no internal components are moving.

What are the advantages of high torque in an e-bike?

In a nutshell, the more torque available the more comfortable and powerful the ride.  With more torque, you can achieve more performance while pedaling less as well as a higher peak performance rate when pedaling fast. In addition, high torque expands the performance spectrum, reducing the need to shift. 

  • Transmission: TQ Harmonic Pin Ring Getriebe 
  • Form: rotationally symmetric
  • Single-stage gear down: 1:37
  • Torque sensor: integrated
  • Freewheel: 2  

Power electronics

The high-efficiency power electronics are located in the motor housing, which provides the best protection, and are optimally matched to the demands of the system. All the components also communicate via the CAN bus using sturdy connector systems and the wiring harness.

Shift interruption

To protect bicycle components such as the chain, sprocket and gear system while shifting, the control system interrupts the drive for a few milliseconds and causes a shift interruption. This makes it possible to shift quickly and to shift while under load. In addition, the shift interruption protects components and increases their service life.

Brake shutdown

A brake shutdown feature can be integrated into the system. With this, the system is capable of immediately shutting down the drive when the brakes are applied.

Display and connectivity

TQ offers a standard, UART remote with integrated mini display capable of communicating via bluetooth with an optional full-color TFT display or with the user's smartphone. A free Naviki App is also availablef or iOS and Android smartphones. The control and display support the range interconnectivity, including navigation, wattage display and text messaging. 

Torque sensor

A torque sensor measures how strongly the rider is pedaling. It is located on the bottom bracket shaft in the drive housing and precisely regulates the amount of assist necessary.

Speed sensor

The speed sensor on the rear wheel provides the system with accurate information on the current speed. Depending on the type, the traveling speed is determined either once or several times per revolution of the rear wheel.


The TQ standard batteries have either 56 or 70 cells. With a 56-cell battery, the drive system has a range of up to 130 km* on a level road. Rechargeable batteries can also be engineered and designed according to customer requirements.

* Depending on homologation, power stage and the rider.

Quick charger

The quick charger recharges the standard battery to 80% of its capacity in about 90 minutes. The battery is completely recharged after just over two hours.

Wiring harness

TQ offers a choice of prefabricated wiring harnesses with different connectors to suit a wide variety of bike configurations and application areas. 



Get started with the TQ HPR 120S.

Integration for OEMs

Basic system information

Design & Innovation

Learn more about our awards.

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Get in touch with TQ-Emobility.

Application Areas

From the mountains to the city streets, let the TQ HPR 120S move you.

Facts and Figures

Technical specifications