^^ On the same page with ShutUpBlud regarding sizing.
You would usually ride these lo-pro frames with bullhorns, on which the riding position would be as in the drops with a normal frame. Having risers on it throws that through the window obviously. The effective top tube length is 54cm, i had a lopro frame with the same effective TT with a 11cm stem and bullhorns no problem, I'm 177 FWIW, inseam around 83cm. >http://www.pedalroom.com/bike/vitus-979-lo-pro-11336
here's the set-up. The friend to whom this belongs is around 183 IIRC, which would be around the tallest i'd go with that TI frame.
^^ On the same page with ShutUpBlud regarding sizing.
Price drop: 500e