My question was more of a curiosity.
I am looking to upgrade my Trek 7.2fx which is a 24 speed. Without a motor I can get it up in the mid-20s on flat ground in the middle gears so I'm guessing with a 20mph motor getting it into the 30s would be realistic using the high gears on the bike. I'm just a little worried that the 7.2fx isn't a good candidate for an electric motor because of its aluminum frame.
I tried an electric bike for first time last week and loved it. I think if more people tried it out a lot would ditch their cars for daily commuting.