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hi my normal stock tire size is 205 60 15's and the pressure suppose to be 31 PSI in the front, 34 PSI in the rear. My point is that i'm running 215 60 15's should i put the pound pressure like i said above? Thanks
1999 Ford Contour SE Zetec with 137k miles.
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it really depends, when you put on a aftermarket set of tires you should usally put in the maxium tire pressure, the pressure the factory puts on there is for the best ride, but this has been a debate for a little while, ive heard both sides of the arguement, but i myself would put in the maxium tire pressure
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Originally posted by SvtEdwardo420:
it really depends, when you put on a aftermarket set of tires you should usally put in the maxium tire pressure, the pressure the factory puts on there is for the best ride, but this has been a debate for a little while, ive heard both sides of the arguement, but i myself would put in the maxium tire pressure
WRONG
Start off with something like 34 all around. See how much contact patch the tires are getting and how they feel, adjust from there. As time goes on, watch how they wear.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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No im not wrong and either are you, the maxium tire pressure rating on the tire is what your supposed to run , anything over that is considered overinflation and a significant amount under is underinflation, ive sent email to good year and toyo about this becuase i had an arguement with the techs at my shop about it, now this is with after market tires, like how i put 18's on my car with low profile tires, how do i know how much air to put it? i put in the maxium tire pressure,like i said in my last post the factory puts the tire ratingd for the most comfortable ride, even though it might wear a little premature, but when you put 32 psi in a tire your almost at the max of the tire anyeay, usally 40. so dont tell me im wrong, unless you have something to back it up. thank you
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The pressure printed on the side of the tire is the maximum safe tire pressure, not what you should be running. The pressure inside the tire should never match or exceed the pressure printed on the side.
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Originally posted by SvtEdwardo420:
No im not wrong and either are you, the maxium tire pressure rating on the tire is what your supposed to run , anything over that is considered overinflation and a significant amount under is underinflation, ive sent email to good year and toyo about this becuase i had an arguement with the techs at my shop about it, now this is with after market tires, like how i put 18's on my car with low profile tires, how do i know how much air to put it? i put in the maxium tire pressure,like i said in my last post the factory puts the tire ratingd for the most comfortable ride, even though it might wear a little premature, but when you put 32 psi in a tire your almost at the max of the tire anyeay, usally 40. so dont tell me im wrong, unless you have something to back it up. thank you
Everyone with knowledge about tires will back me up buddy (including myself and everyone else that works with me at a goodyear shop).
So, my tires have a 51psi maximum pressure. You're saying I should run that? So even though not nearly the whole tire would be making contact with the road, I should still do it? Even though the center of the tire would be wearing much quicker than the rest of the tire, I should still do it because you say so? Do a little research buddy. Thank you.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Originally posted by Matt R:
The pressure printed on the side of the tire is the maximum safe tire pressure, not what you should be running. The pressure inside the tire should never match or exceed the pressure printed on the side.
This is basically correct. Running 41 lbs on a tire that has a maximum of 41 lbs listed on the sidewall is insane. It will ride rougher than a truck and the center portion of the tread will wear out way too fast while leaving reasonable tread on the outside edges.
The sidewall maximum is a cold reading. It can go above that when hot. It would only be appropriate when the car has a heavy load or when the tire is undersized for the car.
Often, the tire maker will have a recommended tire pressure. It may be found in their catalog. Usually I pay attention to the tire makers suggestions and the automakers suggestions and come up with my own, which I alter as the tire wears as well as from experience as I drive. Most of the time I start with about 2 lbs above the automaker's recommendations.
As the tire wears you can see if it is wearing evenly across the face of the tire. If it is wearing more toward the center of the tread, lower the pressure a little. If the outside edges are wearing more, raise the pressure a little.
Usually you will use a little more pressure on the street than you will on the track autoX.
Jim Johnson
98 SVT
03 Escape Limited
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Originally posted by Big Jim:
Usually you will use a little more pressure on the street than you will on the track autoX.
You mean a little less on the street than at autox right?
More for autox to prevent tire rollover.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Joined: May 2002
Posts: 21,653
I have no life
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I have no life
Joined: May 2002
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98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Joined: Jun 2005
Posts: 5,345
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Originally posted by Big Jim:
Usually you will use a little more pressure on the street than you will on the track autoX.
Ed, and a little more pressure usually means 1 to 2 PSI more of the recommended tire pressure, NOT 5 to 10 PSI more. 
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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