Some products set the standard by which their category is judged. The Gibson Les Paul comes to mind. So does the Bosch Performance Line CX. When it was released in 2015—nearly ten years ago—the Performance Line CX was the first system dedicated to eMTBs. Since then, it has become the go-to mid-drive motor for electric mountain bikes, the motor against which all
others are judged. It’s hard to believe that nine years have passed since Bosch introduced the Performance Line CX, considering how quickly the e-bike market moves.
When Bosch set out to redesign the Performance Line CX motor, they chose to keep the basic performance parameters the same: The motor still produces a maximum of 600W and up to 85Nm of torque, making for a 340 percent assist. The question, of course, is why Bosch didn’t increase the amount of
assistance. In Bosch’s view, the Performance Line CX already provided the perfect balance of power, rideability, efficiency relative to battery range and drivetrain durability. More power would mean greater weight, making the eMTB heavier and less nimble; it would also result in a decrease in range because of more weight and drawing more power for the motor, as well as more wear and tear on drivetrain components.