Small. Light. Quiet. Natural.
HPR50

The heart of TQ-Group’s e-bike transmission is the HPR50— short for harmonic pin ring transmission with 50Nm of torque. What’s a harmonic pin ring transmission? It’s a relatively simple, yet ingenious, drive mechanism that operates similarly to a rotary motor, but more refined. Internally, there are three concentric precision pieces, an elliptical wave generator, inner flex spline, and a circular spline, that come together to propel you forward, while remaining small and lightweight. Compared to classic toothed gears and belt drives, a harmonic pin ring transmission is more compact, more powerful, feels smoother, and is more durable.

Due to their precision, durability and compact design, harmonic pin ring transmissions and specifically TQ harmonic pin ring drives, have been used in the space industry, aviation, the medical industry, and robotics. For all the same reasons they succeed in moon landers and surgery robots, they work great in e-bikes as well.

Fitting snugly into the existing bottle cage, the Range Extender offers an additional 160Wh of power to increase the range of your ride by 44%

Mounted flush into the toptube, a two-inch display keeps your setup discrete from a side-view, while providing crisp and bright details from the bird’s eye. The bright contrast stays visible in blinding sunlight and offers just enough information to be useful without overwhelming you at a glance. A single button turns the system on and off, and toggles through riding screens.

Control at your fingertips

A bike this advanced and refined deserves an app equally advanced and refined.

Who is TQ?

TQ is a hard hitter in the e-bike world here to refine and redefine the way we ride. Delivering the best of both electric and traditional bikes, TQ’s harmonic pin ring transmission measures in lighter, quieter, and smaller than most other e-bike drive units on the market. Wherever you roam, its assist feels natural and keeps you one with the ride.

Formed in 1994 as "Technologie in Qualität" in the blue lake land of Bavaria, TQ has grown from two founders to a team of over 1,700 employees across 14 locations, with a passion for innovation. Firmly established as one of Germany’s largest and best electronic product specialists in the fields of robotics, embedded systems, automation, medical technology, and aerospace. You’ll find TQ in the moon-rover and robots performing surgery — systems that need to be equally precise and dependable.

TQ embarked on the e-bike journey as long ago as 2008 and has been building the passion, expertise, hardware, industry connections, and plenty of ride time to prove it all out. In short, TQ is your riding buddy who can hold their own with the best while also articulating the subtle nuances of riding to the most minute detail.

Creating a system this new and this different took heaps of collaboration and a whole lot of prototypes. Through the development process, Germany-based TQ and US-based Trek worked exclusively together to fine-tune the HPR50 transmission system for a ride feel that’s unlike anything cycling has ever seen.

Made by bike people passionate about finding a better way to ride, HPR50 provides nearly invisible assist that feels like a hand at your back on steep climbs and stays nimble and natural whether weaving down steep canyon roads or through technical trail terrain.