Have only geared up to 2nd biggest ring when sweeping downhill. Or less. Biggest ring works best when you know there is no traffic light stop /busy intersection at the bottom of a steep hill or it's a really long mountain descent.
I don't go into my biggest ring with a stiff headwind in my face for the next hr. or so. You mean, a tailwind, lph?
Sorry, I was only thinking about pros and cons of big ring on flats or going uphill.
Going downhill doesn't require much effort which obviously didn't stick in my memory.



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