The top-tube length is no longer a good measurement for sizing a bike. Stack and reach are better for reasons I won't reiterate here.
The problem is, while there are many lookup tables and calculators to roughly guess a top-tube length for person's height, I cannot find the same for S&R.
The long and detailed articles on S&R (etc.) only talk about how to measure it on your bike, and not how it maps to the reader's body in a practical way where they can immediately apply it to shopping online.
Whenever someone asks my question, the responses (across the web) avoid a direct answer and offer instead that "its complicated", "get a proper bike fit", "go into a shop" or "you can only know by riding".
But these answers don't help at all. The reader is left with no answer and they just fall back to using the original flawed top-tube vs. height when choosing a bike from an online seller, hence every advert still quotes the TT length.
So, I know its complicated, but if the bike mags are right, then I'm better off shopping to a flawed S&R measurement than to an even worse top-tube length.
I assume that OEMs choose perhaps 5 different S&R sizes for their frames to target a set of approximate customer heights, so there must be a table somewhere.
What's the ballpark S&R for a 178cm man? (thanks!) ...inside leg, 85cm