how many sweep strokes in one mile?
Yes, and with a 72 gear one would do more pedal strokes for the same average speed. Actually an easier way to estimate number of pedal strokes in general is to count your normal cadence (say 70) and apply it to your time to do an average mile (e.g., 4 min. for 15mph) = 280 strokes per mile. That would yield 28,000,000 for 100,000 miles.