What is the recommended tire pressure for 205/40/17 tires on a '00 Civic Coupe? I used to inflate them with 32 psi when I used 195/50/15.

Any suggestion?

 

The recommended pressure is 30 psi front, 29 psi rear. 32 psi is fine if you prefer it a bit higher.

 

Thanks Clay, I was thinking the lower the tire profile the higher the pressure....

 

is psi dependent on tires or car or both?

for my 205/40/17 kuhmo asx's, someone from tirerack told me 36psi...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gear_e &raquo;</TD></TR><TR><TD CLASS="quote">I was thinking the lower the tire profile the higher the pressure....</TD></TR></TABLE>

Not necessarily.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by funz0rzies &raquo;</TD></TR><TR><TD CLASS="quote">is psi dependent on tires or car or both?</TD></TR></TABLE>

The best place to start is with the pressures recommended by the manufacturer of the car. Adjust from there as needed, due to tire wear patterns, personal preference, etc.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">


The best place to start is with the pressures recommended by the manufacturer of the car. Adjust from there as needed, due to tire wear patterns, personal preference, etc.
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Ya, that's what I do. How but this crazy new idea I have for pressure (cause you know it's going to be something interesting if it is coming out of my mouth)

http://www.tirerack.com/tires/...ge=38

That explains the North American Load and Pressure Markings system. The maximum pressure is not the absolute maximum pressure (i.e. the pressure a tire mounter might use to mount the the tire.). From what I interpret that pressure to mean it is the pressure to run when you are running at maximum rated load for the tire. Could you not assume a linear approximation between the max pressure and load to your running pressure and load.

Example:

Lets say that the tire has a North American Load and Pressure of 40 psi @ 400kg (not realistic but the numbers are nice). Your car you know has a load on that corner of 300kg. Doing the math you should run a pressure of 300psi.

Does this seem like a reasonable assumption as to what pressure to run? I know for instance my old golf had a recommended pressure of 26psi in the rear when empty and 34psi when full so pressure is dependant on load. Obviously it is not too feasable because determining the load of each corner is very difficult.

Again, personally, I just look what's on the door jam sticker and go with that.

Thoughts?

(ya, I was bored again today and reading and thinking too much)

 

I guess the question is, are you going to adjust your pressure every time you take the car out, depending on how many people (how much weight) are inside? Not very practical.

Again, I would just set it at the car manufacturer's recommendation, and then adjust from there as needed...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">I guess the question is, are you going to adjust your pressure every time you take the car out, depending on how many people (how much weight) are inside? Not very practical.

Again, I would just set it at the car manufacturer's recommendation, and then adjust from there as needed...
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Ya, that's what I normally do. Long highway trips when I am moving I do pump up the pressure though.

Nevermind, it was jsut a thought as to determine a good pressure for your car.

Cheers.

 

I also have 205/40/17 on my 00' ex coupe.
I also thought that lower profile tires might need high pressure... I guess I was wrong.

 

I just looked up the car manual and it says 30psi front and 29psi back for 00' ex coupe but 35psi front and 33psi back for 00' si ?? then wouldn't 205/40/17 tires need to pump more air than the si ? I'm so confused now because i have 33 front and 32 back right now

 

Does the ex and the si weigh the same? Could also be some differences in the recommended pressures due to changes in the vehicle such as suspension set up. There are many factors that come into play.

 

Si does weight more than EX and I believe around 60-100 more pounds.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by coolpix99 &raquo;</TD></TR><TR><TD CLASS="quote">Si does weight more than EX and I believe around 60-100 more pounds.
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That's insignificant. I cannot explain the differences in recommened air pressures.

 

True.

Anyway. I've been searching around and people put such different air pressures on their tires when it comes to plus sizing. For 205/40/17 I've seen people putting 32, 34, 36 or even 38. I will just go somewhere in the middle probably 35 front and 34 back.

 

The difference in recommended pressures is most likely because the Si is considered a sporty model for which owners would favor performance over ride comfort, whereas the other models might have owners who care more about ride comfort. The same is true of Integras, for which the recommended pressures on the GS-R and Type R are higher than base model Integras.

Again, this is a matter of deciding your own personal preference. The recommended pressures are a good starting point, but only a starting point; if you feel that you prefer a more "performance" tire pressure, adjust it higher, and if your ride quality is too harsh for your taste, adjust it lower.

 

i usually put about 35 just a little more then the recommended.