Tom Bombadil

Visited a couple of bike shops and stood over several bikes in an attempt to find an optimal standover height. Found a couple where they felt just right, where I felt just a bit snug. Looked up the geometries on-line and found that they were 75.4 and 75.5 cm. That's right about where my measurements were, but it is easier to confirm over a bike than trying to use a tape measure and a book.

On a traditional geometry bike, that's a frame size of 49-50cm.

However when trying out a number of bikes, the ones that put me into my best riding position, according to the judgement of multiple LBS staff, were those with an effective top tube of 55-56 cm. Typically a 50 cm standard geometry bike will have a top tube of around 52-53 cm. My top tube optimal size requires a bike of around 55-57 cm.

So I fit the vertical size of a 49-50 cm bike, and the horizontal size of a 55-57 cm frame. I would need a custom made bike for a good fit in a traditional, non-sloping top tube design. But there are a number of stock bikes with compact geometry that provide a good fit.