40 yrs ago when I began cycling I was 5' 10 1/2" with a 32.5" inseam. At age 76 I am 5' 8 1/2" but with the same inseam. Back then a 54/55 was perfect for me. And, that is also true today. If I had to choose between a frame too big or too small I'd go with smaller to save weight. Otherwise Pagacar will start dropping me.