TQ Unveils World's Lightest, Most Efficient Electric Bicycle Motor







In a significant advancement for the electric bicycle industry, TQ, a prominent German engineering firm renowned for its exceptionally light and quiet e-bike motors, has once again pushed the boundaries of innovation. Hot on the heels of their HPR60 e-bike drive system, the company has now revealed the HPR40, a compact marvel that sets a new benchmark as the world's most lightweight and efficient mid-drive motor.
Crafted specifically for road and gravel electric bikes, the HPR40 boasts an astonishingly low weight of just 1.17 kg (2.6 lbs). This represents a remarkable reduction of almost half the weight compared to its predecessor, the HPR60, which tipped the scales at 1.92 kg (4.2 lbs). Despite its diminutive size, the HPR40 delivers a respectable 40 Nm of torque and can achieve a peak power output of 200W. This design philosophy emphasizes subtle assistance and seamless integration over raw power, making it an ideal choice for cyclists who seek a modest boost rather than an overwhelming surge. This innovative motor is anticipated to be a key component in premium gravel and road e-bikes, catering to riders who prioritize a refined and understated electric assist.
The ingenuity of the HPR40 lies in its foundational design, which was conceived from the ground up for lighter bicycle frames, distinguishing it from motors re-purposed from mountain or commuter bikes. TQ's ambition was to create a drive system that is virtually imperceptible within a bike's bottom bracket, with controls neatly integrated into the handlebars, ensuring a clean aesthetic and minimal visual impact. At the core of the HPR motor's exceptional performance is TQ's proprietary Harmonic Pin-Ring Transmission. This sophisticated drivetrain is ingeniously reconfigured to reside entirely within the bike, replacing the traditional bottom bracket. This clever engineering eliminates noisy gears, minimizes friction, and ensures instant, lag-free motor engagement. Unlike many mid-drive systems from other manufacturers, TQ’s design is so compact and deeply integrated that it is barely noticeable. Complementing the HPR40 is a 290Wh battery, weighing a mere 1.46 kg (3.2 lbs), cleverly concealed within the bike's downtube. An optional 160 Wh range extender, designed to fit into a water bottle cage, is also available, keeping the entire system’s weight under 2.7 kg (6 lbs). This makes it one of the lightest fully integrated e-bike systems currently on the market. Rider control is managed through a discreet remote hidden beneath the handlebar tape, while a sleek end-cap LED display provides essential information without compromising the bike's streamlined appearance. This minimalist interface underscores TQ’s commitment to an unobtrusive riding experience. The practical application of this technology is already evident in Canyon’s new Endurace:ONFly, an e-road bike weighing less than 10 kg (22 lbs). The Endurace:ONFly seamlessly merges TQ’s gentle assist with Canyon’s aerodynamic design, offering a bicycle that feels traditional yet provides electric capabilities.
The HPR40's high torque density means cyclists can effectively double their pedaling output with a modest 200 W boost, translating to enhanced climbing ability, extended ride durations, and a natural feel, all without the drawbacks of heavier systems. This innovative motor signifies a pivotal shift in electric bicycle engineering, moving beyond sheer power to embrace invisible, intuitive power systems. For enthusiasts who appreciate the delicate balance between the traditional feel of cycling and the advantages of electric assistance, this is a significant breakthrough. Moreover, such systems can prolong the cycling careers of riders as they age, enabling them to continue enjoying the sport. The question now is whether other brands will adopt this ultra-light motor in commuter e-bikes or adventure-ready gravel rigs. TQ is demonstrating a commitment to thoughtful, intelligent, and purpose-built design. The HPR40 is just the beginning, hinting at a future where e-bikes feel less electric and more akin to classic bicycles, maintaining the joy of cycling while providing assistance when it is most needed.