The theoretical maximum change of pressure in flight is of course one
atmospher of pressure - that's one Bar, which is about 14 psi. Most
tyres will take 40 or more psi, and most unicyclists run them a lot
lower.
Of course, the plane will never go so high that the air pressure is a
whole atmospher lower than at ground level, otherwise it would be in
space, and the wings wouldn't work.
Fast road bikes run tyres at 100 psi or more, and a few extra psi could
make a difference. For your uni, it's unlikely to matter.
More worrying is that in the unshielded hold of the aeroplane, the
frame will be subject to higher levels of cosmic radiation. Any
components containing aluminium can retain this for several weeks, so
it would be as well to wear a protective layer of baking foil inside
your cycling shorts for the first few rides after a flight.
--
Mikefule
"No one likes circus skills, juggling is dire, and clowns are on
registers at most police stations."
(The late and sadly-missed Linda Smith)
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