I set up the Fuji conversion with about a 60" 2nd gear.
cadence * 0.002975 * gear inches = speed.
and 60 rpm in 2nd gives me about 11mph (~60 * 60 * .003) - happy enough for around town, giving a first of 45" (enough for many hills near town) and high is 80" - fast enough for low 20's if I'm feeling saucy.
If I was setting one up for recreational riding, I'd probably bump that up a little.