My Mountain bike with 27.5"/650B wheels 21-80 gear Inches and believe me, above 70 GI's Is for pavement or hard pack level ground..
My 20" wheeled folder,, tops at 90 ish GI's and I use them all.
My Long wheel base Tour easy with just lights, rack and empty bags is 41 pounds with a Gear Inch range of 25-125". Funny,,I use no more than 95 ish, ever.