Mighty mini chain ring
Works great with a rearranged 11-40 sunring 8 speed cogset. I disassembled the cogset and put the 4 largest sprockets in the 5th, 4th, 3rd and 2nd positions, then set the derailleur stops so that only these 4 sprockets were useable. Now, when my 52 volt battery runs out of juice on some lonely dirt trail, I can shift to the 40 tooth cog and manually pedal the bike back to my vehicle.
Luna Mighty-Mini 30 tooth BBSHD Chain Ring
First to be fair this chain ring went on my first and only ebike build. I also have very little experience working on or maintaining my own bikes. I broke a chain within 4 mile after adding this chain ring. Just chance? I don't know. Today my chain rolled off and wedged between the motor and chain ring. It was bound up tight, several teeth bent. I wish I knew why the chain is jumping off and breaking with this ring but the standard 46 tooth steel ring that came with the 1000w Bbshd never did me this way.
Hi the issue you are having is due to chainline. Any chainring lower than 42t cannot wrap around the casing of the motor and as such has less much less offset (the teeth are further away from the frame than would otherwise be the case) This is covered in the documentation at the bottom of the listing, that unless you have a very wide fatbike you will likely want to switch to an IGH or rework the cassette in order to have a good chainline through all gears.