Track racers usually use gears in the 88-92 range. A sigle speed bike, beach cruiser etc, is in the 60-70 inch range.
I just recently started to ride the track again and an 81 inch gear feels quite big. I have not been able to spin in out. For the street, 81 would be way too big for me, I'd start with something ion the low 70s.
Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1