Hi there. I took a friends Ezirider 20" wheel for a ride today, and it was simply awful. Either the rear cassette or chainring were not set up properly; he has 2 of these bikes and complains about the crazy high speed he has to pedal and I totally agree.

Im purchasing several Ebikes 20" and 24" and I dont want the supplier to chuck on a gearset which is fitting for a 26" wheel which I suspect the Ezirider does.

Can anyone recommend a resource that will give me the correct specs for these smaller wheels? Or make recommendations?
Thanks kindly, Alistair.