Figuring 0-30mph based on amperage ..

With this esc doing 140 amps https://www.discoverzesc.com/raiden7-series
I’m wondering how fast will it get a rider from 0-30mph. Assuming 200lbs rider. A kv that get you just up to that top speed. And the powered wheel a 20” bike wheel or an 84mm skate hub motor.

I forget how to convert kv to kt to even start but I was thinking when u have that multiply it by the amps and then figure related to the 200 lbs and circumference. Then finally factor in wind resistance. Something like that. Hoping someone can show the math.


I think that’s all the variables and then have to multiply by a realistic efficiency.

kT in Nm/A = 60/(2*PI())/(kV in rpm/V)

However, 140A to a high-kT hub motor on an upright bicycle may be control (wheelie) limited, meaning acceleration would have to measured experimentally.
That fact should give a qualitative idea...

kt = 1/kv

markz said:

kt = 1/kv

Click to expand...

Note that this is in radians per volt second, rad/V·s.
I edited my post to clarify.