NOTE : For storage periods greater than 6 months, it is recommended to
install old tires (or wheels equipped with old tires) on the nose and main landing gears.
That agrees with what I said (as you don't care what happens to old tyres)]
Example : - Aircraft with 49 x 17 tires normally inflated at
187 psi. (pressure A/C on ground)
- A/C storage weight = 140 t with fuel
187 psi x 140
Tire pressure for storage = ------------- = 158 psi
How did you get to 158psi?
A good site for tyre info is http://www.goodyear.com
go to Aviation Tyres section, then Tech info and download the the info PDF file.