I find the direction people want to go surprising.
I have really low gearing. 22,32,44 11-32. I have considered swapping it for one or two up which would bring me to a lowest chain wheel of 24 or 26 respectively.
I hit a 27% grade the other day... Fortunately my pack was light. I found myself reaching for one gear lower then I had. but at about 2 1/2 mph it would have been difficult to stay up.
100 rpm puts me a bit over 30 mph...
One thing motorcycles taught me, Don't out run your eyes, or your brakes.
Never considered how much faith it must take to ride in a pace line until just now.