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Discussion Starter · #1 ·
I have an interesting puzzle, I have my opinion on this but I thought I'd run it past everyone to see what shook out.

I bought new tires yesterday. For reasons not germane to the question I stayed with 15" rims. However, I did upgrade the width.

The question, what should my tire pressure be?

The specs:

Original tires:

205/65-15
35 psi max tire pressure
1400lbs carrying capacity @ 35 psi.

New tires:

225/60-15
44 psi max tire pressure
1592lbs carrying capacity @ 44 psi.

Sticker says:

35 psi for the 205 tires

So the question is what psi should I run? Too much and the center tread wears out fast. Too little and the out edges wear out too fast and the car is wiggly. More pressure usually means less rolling resistance, which equates to better performance and mileage.

Steve
 

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the max number is not what you want to run, not sure on yours but on my 275 17's i run 32psi and they wear great.
 

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Discussion Starter · #6 ·
Well, I know four ways to find the right answer.

One is to put some rubber down and inspect the marks. If the tread is even across the track then the pressure is good, light in the center, add more air, light at the edges, lets some air out.

Second it to put many miles on them and see how they wear. Not quick and not cheap if you wear out the tires by having them under/over inflated.

Third is to ask around.

Finally, do some math.

1400lbs @ 35 psi works out to 40lbs per psi

1592lbs @ 44 psi works out to 36lbs per psi.

38 psi in my new tires works out to 1400lbs capacity in my new tires. This would be my starting point.

Steve
 

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having more area around the rim i would just about bet they need more.
 

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i rotate my tires every 3k its only like 15 min of work and it really makes em last longer.
 
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