An easy bet is buying from a good existing bike company like Specialized. High end ebikes from Gazelle and Riese and Muller are also good. Avoid low end generic

An easy bet is buying from a good existing bike company like Specialized. High end ebikes from Gazelle and Riese and Muller are also good. Avoid low end generic and drop shipped Chinese imports unless you really have no budget but you might have issues and you won't have support for repairs.