You can do better then that. CYC motor kits can take up to 72v, and they don't care about talking to the BMS of the battery, so you can pretty much run any bat

You can do better then that. CYC motor kits can take up to 72v, and they don't care about talking to the BMS of the battery, so you can pretty much run any battery. The final reduction is external, so they sell different chainring sizes. With higher voltage, you get more motor speed, so you can do a bigger reduction for the same power, which means lower motor required torque for the same wheel torque, which gives you efficiency. I have the 52v setup from them on a full suspension mountain bike, with the 416wh battery, and I have done 30 miles on it with pedal assist and knobby mountain bike tires and basically got the battery down about halfway (im fairly fit and have a higher FTP so I don't require much assist). If I was to build a setup like in your post, with a big 72v battery taking up the entire front triangle of the bike, and use faster rolling tires, I could either have an ebike that can probably keep up with cars on a highway under throttle, or in the pedal assist mode, do over 100 miles.