I'm hoping someone here has one of these motors, http://www.thesuperkids.com/10wabmcbrbim.html
and can help me out.
I'm trying to design a mid drive to assist climbing the steep hills around here, top speed not so important.
This is what I have so far:
With the motor & planetary driving a 48 tooth chainring the motor RPM seems low at the cruising peddling RPM of 60-85RPM (= motor RPM ~730 to ~1030).
There is no Kv value for this motor that I can find on the BMC website (what a mess!) and the seller doesn't know either.
Does anyone know if this range of motor RPM will be too low to be anywhere near efficient?
My initial thoughts are that another gearing factor of 2 to 2.5 is required. Which would make the chainring too large and/or the motor cog too small. So most likely it will require a jackshaft.
PS: hello all (first post)!