My 20 inch ebike currently has Kenda Kwest 1.5" wide tires. They're not comfortable at all, and my ebike has no suspension whatsoever, so the ride is only smooth on perfectly smooth roads.
I think 2" of width is the limit for my frame, maybe 2.15 or 2.25 will fit but I won't take the chance of buying useless tires, especially considering the fact that I'll buy them online from Germany.
So, I was thinking about getting the Big Apple tires, but on Schwalbe's website it says "EBIKE READY 25", which means they're good for ebikes that do 25kmph or so. They also have "EBIKE READY 50" tires, and my ebike's speed is 32-37 on flat roads, and 44-55 in declines. Will the Big Apple explode or something if I rode this fast with them? The Kwest don't seem to mind the speed (about 1500km so far).