2.1:1 is the low limit.. [Rohloff is 2.35:1] higher than that is no problem.. my bike friday 20" wheel is 53:16. Koga WTR, 26" wheel 38:16.. (at low limit)
over the road, ratio range, the same..
Torque strain against gravity, going up hill, is greater than the effort done on the flat, against air resistance to go faster..
[because It's gear ratio X wheel diameter a smaller wheel gives you a lower gear using the same ratio ]
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Last edited by fietsbob; 05-03-18 at 10:39 AM.