Hi,
did you get any fruitful info about that by any chance? I am having the same problem in mine. As i noticed, the sprocket was made up of aluminum that's why they are so easily-wearable.

In mine, I cut the smaller inner sprocet and attached a new sprocket from other company with two more teeths. Now I have got another problem - chain skipping. If i use one link short it is just a milimeter too short and if i use one link long it is way too long.

I bought this bike because it was so unique. but now i am getting problem every now and then. It's so frustrating repairing this thing so often. But again, my mind doesn't let me move on from this thing.

Please any info about anything that relates to mobiky genius would be appreciated. Thanks for bearing me up this far.