See, this is what happens when you are doing two things at once.... LOL.... Sorry to Justin..
Now I have to go apologize to Erik for calling him Justin....
I don't know Erik. And I am recently retired and setting up an ebike repair shop in Boston.... BUT!!!...... I used to own "cars.com" back in the 90's. I was going to set up a hobby page. Back then the idea of commerce wasn't born yet.... I think Erik deserves to monetize ebikes.com in a fe...
So I wanted to add some build info that I didn't find .... using the 120mm motor you'll need spacers. The best line up with both cranks fairly even distanced, 8mm worth of spacers go on the bracket side. The chain ring is dead middle when doing this. Also plenty of room for casing and bottom chainst...