Originally Posted by steelbikeguy

yow! good point!
I don't recall Frank Berto ever covering this particular type of gearing. I was going to say it was a triple half-step, but half-step plus sonny is a contender too.
Or in deference to modern terminology, maybe it's a thruple? Beats me.
It does raise questions about whoever configured this gearing. Someone obsessed with very close gears over a fairly narrow range?

edit: it occurs to me that it might actually be a 1/3 step gearing arrangement. No idea why someone would want this, but it makes more sense than a half-step triple. If the step between the rings were half of that between the freewheel cogs, then the large and small rings would produce a number of duplicate gears.

Steve in Peoria