If I'm riding a bike that looks like that, I won't be wanting 100 gear inches on an upright bike...Sorry, but trying to push high-mph averages with an upright bike in anything but the flattest of terrain is silly. If you want that, get something that allows you to actually be a bit more aero - making yourself into a wall doesn't seem to be the way to go. If I wanted a bike like this, I'd have a single front chainring and an 8-9 speed derailleur - you can still use a chain guard, and you have the gear inches you want, depending on the chainring. Honestly, a 48 tooth ring with a 13-27 7 speed rear is all that I would need (and all that I use)...