I can generally ride 52-56" frames. Even rode a 58cm Giant roadie with an 80cm stem and just a couple inches of seatpost showing one day, not a bad ride at all, but bars were kinda high for my taste- fully fredly 1" or so above saddle. Would probably suck if both feet came off pedals while straddling top tube tho

On my 52cm I have 130mm stem, respectable saddle to bar drop and short wheelbase. Makes cornering fun