The New Mahle M40 Motor: A Potential Game-Changer for the E-Bike Future
The New Mahle M40 Motor: A Potential Game-Changer for the E-Bike Future
A new development is emerging in the e-bike landscape that could redefine expectations. The Mahle M40 motor has been recently introduced, distinguishing itself with remarkable performance and technological innovations.
Key Performance and Features
This new motor boasts impressive figures: 105 Nm of torque, a maximum power of 850 W, and a light weight of 2.5 kg. While Mahle is more recognized in the assisted road bike market, with motors found on models from brands like Merida, Bianchi, and Wilier, and also produces the motor for the Specialized Turbo Levo SL, the M40's introduction marks a significant expansion into the electric mountain bike segment.
Mahle is a large company employing around 68,000 people, and its cycling division is just one part of a conglomerate that extends into the electric automotive world.
The M40 is a mid-mount motor, the most common configuration for e-MTB motors, and it comes with a new range of batteries.
Relevant Technical Details
The performance of an e-bike motor is primarily determined by its torque and power output. The M40's 105 Nm of torque and 850 W of maximum power position it among the top-performing motors currently on the market, offering assistance that can reach up to 400%. Peak power is delivered at a cadence between 90 and 120 rpm, but significant performance is still available at lower speeds. Its 2.5 kg weight is achieved thanks to a lightweight magnesium casing, aligning it with the latest full-power motors.
Mahle's "Decoupling Mounting System" is designed to reduce the transmission of vibrations from the motor to the frame, enhancing riding comfort. Cranks connect via the ETOR standard, ensuring compatibility with a wide range of manufacturers.
Battery Options and Power Management
Two battery options will be available: the 534 Wh iM5 (2.5 kg) and the 850 Wh iM8, the latter designed for those seeking optimized range up to 150 km or 2,500 meters of ascent. Both batteries share the same form factor, allowing for interchangeability on compatible frames.
A crucial aspect for e-MTB motor performance is thermal management. Mahle's system is engineered to prevent overheating: if the temperature approaches its limit, maximum power is limited to 750W to maintain a smooth riding experience without compromising motor integrity.
Sensor Innovation and Smart Software
The M40 motor integrates various internal sensors, including accelerometers, torque meters, and gyroscopes. A high-resolution rear-wheel speed sensor, capable of 84 readings per revolution, allows the system to detect speed with great precision (every 3 cm on a 27.5-inch wheel). This data enables the motor to adapt assistance based on rider input and terrain conditions. For instance, if the rear wheel loses grip on a climb, power can be reduced to regain control. Similarly, on descents or turns, power delivery can be modulated to prevent loss of control.
The motor's "Dynamic Overrun" function adjusts the residual pull after the rider stops pedaling, optimizing climbing performance. Mahle has stated that it continuously monitors user data to improve the software, aiming to further refine the interaction between rider and motor.
Assistance Modes and User Interface
Three assistance modes are available: Level 1 offers 100% assistance, Level 2 provides 200%, and Level 3 gives up to 400% assistance, maxing out at 850W.
For control, there's a wireless on-bar Trio Remote with three buttons and LED status displays. This is complemented by a 1.9-inch color display mounted on the top tube, which shows a wide range of customizable data. A second Trio Remote can be added for additional functionality. A dedicated app allows access to supplementary data and further motor performance customization.
OEMs (bike manufacturers) will have access to around 100 customizable parameters to tailor the motor to their bikes, while riders will also be able to fine-tune a second, narrower layer of motor performance.
Mahle also offers a suite of additional items within its e-bike ecosystem, including neat wall-mounted chargers that mirror those in the automotive world. The introduction of the M40 represents a significant step for Mahle in the e-MTB sector, with further partnership announcements expected at Eurobike 2025.