Awesome, miles! May we copy it to our own wiki?
I never knew fixing different parts of a planetary gearbox produced different ratios!
That's exactly how an internal geared shifter hub works
. U get 6:1, thats right.
I'm looking at 4 MPH in low gear and like 17 in high with my 12 turn Mac
The 12-turn MAC has 200rpm@36V and 1000rpm motor speed. Let's say unloaded speed is 1.3tims the loaded, so we look at 1300rpm unloaded. That's a KV rating of 36.
Made a table you so can play around with the numbers (check the attachment). It's the version i assume you use ATM (with 5:1 MAC reduction and 20/44T crank reduction). I see you use a 20T sprocket on your MAC. SO I assume you only use 36V (that's perfect match after my calc). Why don't you just switch to 72Volt by connecting your batteries in series?
Edit: corrected an error with the climbability value