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
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.
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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