Depends on driving style and sidewall stiffness..
comfort + soft sidewall (falken 912, conti cc1, nct5) ~32 psi
handling wise + soft sidewall can go 36psi
handling + hard sidewall (mich PP2) ~32 enough

U put 25psi only if all u care about is comfort - which in the first place is mismatched priority (comfort is for 55 series above, 50 and below normally hard rock low profiles for handling)
u cant feel the road

but
shoulder wear on tyres is awesome..
fuel consumption also awesome..
$ to change tyres more often

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Added on December 30, 2008, 4:21 amNoprob lah difference is 5% only wat..
take note its for COLD tyres.. if u pump when hot add 20kpa to the cold ratings to compensate for air expansion otherwise its still underinflated

Depends on driving style.. for me i corner like gila wan so shoulder wear is quite high
compensate with higher pressure (280kpa on 195/55/15) cos i also do alot of highway cruising
end up even wear

This post has been edited by ceo684: Dec 30 2008, 04:21 AM

wont explode so easily wan.. the sidewall rating is for max cold pressure
the tyre engineered for use, not for showroom usage

got one time i saw one champion pump his stock saga LMST with 400kpa. Im waiting to use air pump also cannot believe my eyes hahahaha

Sime tyre A-star you know. Dun pray pray.