Tire pressure should depend on your
A) What your ride
B) Whatever feels good...


If you ride Street and skateparks mostly, then you should run your tires hight in the PSI department, like 80-115PSI...
And as for Trails and Dirt try lower PSI for the wetter the dirt/jumps
When my trails are wetter then normal i usually deflate my normal 80ish PSI to maybe a 60ish...(im guessing) but you should get the point...