Kabuki12

I was 6’1” and now just 6’ . My legs are still long for my height with a 35” inseam, all legs! I like a 63cm bike but will ride smaller , say 60cm. I don’t really notice too much difference once they are set up for my comfort level. The most important thing for me , other than frame size, is stem length. The reason I like racing bikes is mainly because the top tube is short so with a 90-100mm stem is my sweet spot on the right bike. My favorite bike is my Medici and it is a 60cm with a 90mm stem with the seatpost raised a bit , the bike is just right. I don’t think our legs get shorter as we age , it is our trunk. Shorter cockpit(top tube length) is what works for me .

Charles Wahl

I'll argue that as you get shorter, your back also loses flexibility, meaning that the racy drop from saddle to bars you had in your youth becomes less and less comfortable. A larger frame has a taller head tube, which makes it easier to raise bars, given only a fixed amount of stem rise before you hit the "min, insertion" line. I am 5'-10" with PBH ~38 cm, shrinking like everyone, but have ridden a 63 cm frame comfortably for years -- have used the same saddle-to-pedal height for all my adult cycling years, even when I had a too-short-for-me 57 cm frame. I can ride a 60-62, but have no problem with the 63. I do have a somewhat "toes down" pedaling preference, which means a taller saddle location than many folks. Standover is not a problem, nor stops without a dismount, though mount and dismount themselves are getting a bit more challenging (see reduction in flexibility above) -- but I do that only once per roll, and I pedal constantly -- it helps if I remember to rotate the bike sideways a bit when doing either. Yeah, a sloping top tube, I know . . . but that's not in my bike fascination vocabulary. YMMV.

How are bikes with sloping top tubes "measured" conventionally, anyway?

rovis

I have the option to buy the current one for a friendly price. Sure, a shinny brand new bike would be nice, but this Bianchi is not bad. Just a little worried that some specs (saddle position), and overall size might be at the lower limit for myself.
I'm not (yet) attached to any particular brand, so Specialized or others, are fine with me. I kind of like the Orbea M20, Scott Addict 10, etc. Most important for me is that I don't want to jump over $3k (too much) in case I decide to get a new bike, and an entry level carbon bike is more than sufficient for my current level of experience.

ryansu

dimensions matter too I am nearly 5'11' but I have the short legs of my 5' 8" brothers so I am all torso which means I usually get a 58 cm bike have zero stand-over but the top tube works and makes the bike work. the funny thing is I rode a 54 cm cannondale for a decade before realizing it was too small

The Golden Boy 

I was always 5'7" or 5'8". (I have 5'7" on my driver's license) I assumed I was getting shorter and I was shocked a couple of months ago to measure at 5'8" again. I had them check a few times.

FWIW- I got my driver's license renewed last summer. I had that license for almost a full year. Then one day I looked at it and saw that I was listed as being 6'7". So either I wrote down 67" or they fat fingered 5'7".