Lots of good sites....WrenchScience is one of them.
Nothing specific, but something to remember about road sizing:
It needs to be more specific than for a mt. bike. Think sitting in the saddle for many hours.
Things like torso length, arm length, leg height variances...etc...they all make a real difference.
You can ride a properly fitted road bike frame/stem length, handlebar width, etc for many hours quite comfortably. Much more so than a mt. bike. Standard road 'drop' bars give you 3 primary hand positions as well. KILLER important for extended neck and shoulder comfort.
I'd say do some research.......as a general rule, buy as small of a frame as possible, and make fine adjustments with the components. Stem length, seat height, etc.
Cmdr 'watching the asphalt go by for hours' Piffle
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