This article is from the Unicycling FAQ, by Beirne Konarski with numerous contributions by others.
Generally, unicyclists overinflate their tires by as much as 50% and
sometimes even more. However, if one is learning to ride on a slippery
surface (gym floor) and wheel twisting becomes difficult to control, the
tires can be underinflated to increase the tire area that comes in contact
with the floor. This will make wheel twisting easier to control. Once one
has learned to ride, the tire should be inflated to at least the recommended
Try to get 40-50 psi or more rated tires and you may overinflate these as
well if you like. However, a 32psi tire will work fine, too.
Ken Fuchs - firstname.lastname@example.org