[ViBiker]

Originally Posted by ViBiker

Took a bit of searching, but I found my graph, of gearing-voltage comparisons.
I even factored in road load and wind resistance:

Note: This graph is based on a Mountain Style bike, with rider in a semi-upright seating position.

Most DC motor, Watt output (HP) graphs show highest output at 75-80% of no load speed.
For example, the 36V w/16T mod, no load, speeds at 34mph.
WOT, level travel, motor only, provides, approximately, 27mph which figures at 80% of no load speed.
Which indicates max possible speed from the 675w output motor.

This motor is optimally geared for highest motor only speed.
Gearing for higher speed would decrease motor only speed, but increase, combined, motor & pedal assist, speed.

[Industry_Hack]

I take back an earlier comment. One of my pet projects sketched on more than one napkin has been a recumbent trike, fully enclosed, with an electric motor tucked in down low, and solar panels replacing some of the bodies panels, so you can charge it while at work.

[ViBiker]

Human power. Healthy male vs trained athlete.
Possible power output (watts), for various durations.