Mahle M40
Mahle's first serve in the full-power mid-motor segment. Previously known primarily for hub motors, Mahle delivers a technical masterpiece here: 2.5 kg light, but a whopping 105 Nm torque and 850 W peak power. It uses a 48-volt system and is compatible with the ETOR crank standard. The M40 positions itself as an ultra-light high-performance solution for E-MTBs that are supposed to feel like agile trail bikes despite "Full Power."
Battery System & Chargers
🔋 Battery System
| Model | Capacity | Weight | Energy Density | Dimensions | Mounting |
|---|---|---|---|---|---|
| iM5 | 534 Wh | 2.5 kg | 214 Wh/kg | n/a | Internal |
| iM8 | 800 Wh | 3.8 kg | 211 Wh/kg | n/a | Internal |
🔌 Chargers
| Model | Current | Dimensions |
|---|---|---|
| Active Charger | 4 A | n/a |
Power Characteristics
Shows how much power the motor delivers for a given rider input. The value shown is pure motor power, adjusted for input and drivetrain losses.
Input vs. Output: Mahle M40
For their first full-power mid-motor, the minds behind the Mahle M40 decided on progressive, sporty behavior regarding power delivery. For the maximum output of around 700 watts, a considerable 220 watts of rider power are necessary. On the other hand, such a performance profile scores with naturalness and rewarding riding behavior.
Unterstützungsstufen
Comparison of different assistance modes (e.g. Eco, Trail, Turbo).
Profile: Mahle M40
The three factory support levels L1, L2, and L3 are well-tuned to each other. The gaps are clearly measurable and noticeable, but still even. Striking is the lack of a progressive support level: All modes possess fixed support factors: approx. 400% for L3, 250% for L2, and 70% for L1.
Cadence Behavior
Shows the optimal RPM range.
RPM: Mahle M40
The Mahle M40 shows no weaknesses in terms of cadence stability: It shines with solid support even under 50 rpm and subsequently remains very constant up to a cadence of 125 rpm. Beyond that, it then loses power noticeably.
Thermal Performance
Shows power output performance over 15/20 minutes under constant full load.
20 min
Even if the thermal stability of the Mahle M40 is not perfect, it is quite impressive how long the compact and, at 2.5 kg, very light motor can hold its power of around 700 watts. Only after around a quarter of an hour does it go into derating, which furthermore sets in gently, and the power loss remains manageable. In practice, this should hardly be noticeable.