When you increase the tyre size the tyre air pressure recommendation chandes
Eg if you adopt 185/65 r14
It is awide tyre and more air is volume of air is needed to build pressure. Thus there will be a great variation in air pressure with temp.
Since recommend is 36 in front 34 in back
You increase tire width thus decrease 4 psi
Also taking pakistani road conditions in consideration decrease more 4 psi
Now you should have 28 in front 26 in back best presaure