Bosch Gen 5 efficiency

[Rizzle]

What is the percentage rating for efficiency for the current Bosch Gen 5 motor

 

[Greg Watts]

What is the percentage rating for efficiency for the current Bosch Gen 5 motor

The CX-R motor was independently measured at 78% efficiency in a motor comparison test, which is the highest of any motor tested, if that's the specific figure you're after.

In real-world terms, @Plummet ran a controlled comparison on the same 950m vert route and found the Gen 5 used 332Wh versus 374Wh for the Gen 4, roughly 11% more efficient. That's the most concrete back-to-back data I've seen.

For optimal efficiency out on the trail, the consensus is 80-90rpm cadence. The motor also has an internal freewheel that decouples the gears when you ease off, which helps avoid drag losses compared to older designs.

If you're chasing a specific published efficiency percentage from Bosch themselves, they don't typically release that figure publicly. The 78% comes from independent testing rather than anything official.