On Fri, 11 Oct 2019 18:46:52 -0400, Joy Beeson
wrote:


It's been half a century since I needed the information, so I'm not
sure. Is a nineteen-inch bicycle frame nineteen inches from the
center of the bottom bracket to the center of the seat cluster?
"Center" defined as the middle of the top tube.

I measured my Fuji at 20.5 inches, and the guy I stole it from said
"twenty-one inches" sounded familiar.

To the top of the top tube seems more logical, since it's the
stand-over height one is interested in -- a fat-tube aluminum bike
would measure undersized if measured to the middle.

When I was thirty and forty and sixty I didn't mind that he's an inch
taller than me, but now that I'm seventy-nine, I've fallen over while
mounting twice, and think it's time to put the word out that I'm in
the market for an elderly bike that is compatible with my elderly
components.

But I have to say what size I want.

Most of the formula use height and in-seam measurements use . Try
https://www.bicycle-guider.com/bike-...ke-size-chart/ and
compare it with your current bike, but beware that this fits you to
the bicycle, i.e., essentially the distance from the seat to the pedal
at the bottom of its stroke and if your problem is getting from the
ground to the top of the thing you will need to change these
measurements. But beware that the closer the seat is to the ground the
shorter the distance from the seat to the pedal will be and you may
find yourself pedaling with bent knees which can be uncomfortable as
well as inefficient.
--
cheers,

John B.