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my 1999 accent is 30 psi on all four tires, and my 2002 protoge5 is 32 psi on all four tires, so i'll guess a 1997 tiburon is 30 or 31 psi on all four tires.
 

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to get the proper tire pressure for any non-stock wheel/tire combination (or stock I guess)

Find a straight stretch of road or parking lot with zero traffic

Get some chalk

Make a wide (4") strip of chalk across the treads of the tire

Drive straight

Look at the tire.

Rubbed off in the middle, pressure is too high
Rubbed off on the sides, pressure is too low
Rubbed off on one side only, alignment is out pretty bad
Rubbing off evenly, tire pressure is pretty close to good.

You want a contact patch on the road that goes evenly across the tire. That's the best way I know to find it DIY style.
 

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For the Coupe pressure should be 2,1 bar (30 psi) in all 4 tyres if factory dimension of tires are on the car. If you have low profile tyre like 215/40R17 then pressure should be 2,5 bar (36 psi).

2 Stocker; your method is not bad… but it is little bit complicated…
 

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Complicated, sure, but the contact patch is the only thing you have touching the road. When it's right, it's right, and you want it right, right?. My method is a lot cheaper than driving on a wet plate of plexiglass over fancy SONAR sensor, and gets the same result.

That said, rule of thumb is most cars will be ok with 30, I run mine at 40 even though it's too high, because tires leak a little and I almost never check it.
 
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