The Bafang BBS01/02 standard steel chainring with 46 teeths, with a long durability and a reasonable price!
With an offset of 5 mm (measured from the motor bolts to the middle of teeth) and a weight of 262 g.
The inner hole has a diameter of about 50 mm, the bolt circle of the chainring bolts has about 60 mm. The outer diameter (incl. teeth) is about 190 mm.