OK I'm quoting straight out of the Haynes manual here

175/65 R15 84H, 195/55 R16 87H, 205/45 R17 84V
Normal load ...... Front 2.1bar (31psi) Rear 2.1bar (31psi)
Full load........... Front 2.4bar (35psi) Rear 2.4bar (35psi)

205/40 R18 82W, 175/60 R16 82Q,T,HM+S, 175/65 R15 84Q,T,HM+S, 195/55 R16 87Q,T,HM+S, 205/45 R17 84Q,T,HM+S
Normal load ...... Front 2.3bar (33psi) Rear 2.3bar (33psi)
Full load........... Front 2.6bar (38psi) Rear 2.6bar (38psi)

T115/70 R15 90M......4.2bar (61psi)

Lesson over for today kids