Can someone show me the differences between the Fathom E series of bikes? i have been looking aat getting the E+2 but i've seen listing showing different bikes. It's mainly the gap between the down tube where the battery is and the top bar..some have quite large spaces which go quite close to the steerer tube and some have a very slight space which doesn't go as close. I'd be very grateful if someone can show me the differences or a good web link to show? thanks.