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25-30.. for a car as light as ours.

Try 27 all around, take it for a spin.. Front end want to push? try 30 on the rear.. Rear end want to come around on you? try 26 on the rear 29 on the front. Dont go less than 23 or more than 35... for street tires...

Also, take chawk or shoe polish, put it on the tire on the front of the tire, about 2 in from the ground in a line.. drive it.. take some corners hard. See how far the tire rolled (this is what the chawk is for where it rubs off) if you went past the tread, inflate the tire more, if you had lots more tread to go, deflate tire.


Chaulk the edges.

start with 32 F/R go to a parking lot preferable empty. Go fast turn hard. you should be able to scrub the chaulk right down to the little arrows on the side of the tread.
If you go over the arrow add more air to keep side wall stiffer
can't reach the arrows Turn harder or let some air out.

Should by the nature of tires and cornering forces end up with optimal tire pressure front and back more than likely different.