Speak for yourself. I'm a hair under 5'11 and I ride 54 or 55 quite comfortably. It depends on geometry because every bike and every person is different. For me 545-550mm top tube is the sweet spot. This bike is probably 540mm top tube but I'm sure plenty of people that are 5'9 or 5'10 may be comfortable on it

But I personally wouldnt be comfortable on a 20-25 year old lugged carbon frame. Not to mention that carbon frame with alum fork is all backwards. But, price is probably reasonable considering the SF used bike market.