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Old 18-03-2011, 05:05 PM   #1
jsk710
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Default Tyre Pressures !

Hey Guys
Can you help ?? Just looking at the tyre pressures for my new car under normal running no load it says 38psi !! Is this right
G6ET with 245x35xZR19 Dunlop SP Sport Maxx
It may be right just seems a Tad High
Loaded is 42psi
Many Thanx
Keith

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Old 18-03-2011, 05:16 PM   #2
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Default Re: Tyre Pressures !

that sounds about right for 19s....
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Old 18-03-2011, 05:25 PM   #3
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Default Re: Tyre Pressures !

Quote:
Originally Posted by uteaddict
that sounds about right for 19s....
Yeahh there just dont seem enough rubber for that amount of pressure !!
Used to having bigger rubber than these are....lol
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Old 18-03-2011, 05:27 PM   #4
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Default Re: Tyre Pressures !

Hate to think how much they are a shot........
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Old 18-03-2011, 05:30 PM   #5
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Default Re: Tyre Pressures !

Quote:
Originally Posted by jsk710
It may be right just seems a Tad High
I was thinking that was a tad low actually haha.
I thought the lower profile tyre, the more pressure you want?

Also, just letting you know AFF does have a wheel and tyre technical area.
here
http://www.fordforums.com.au/forumdisplay.php?f=103
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Old 18-03-2011, 05:32 PM   #6
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Default Re: Tyre Pressures !

The pressure required is 38 to 40 psi for those tyres.
Remember force is pressure over area.
This relates to the area inside, the air cavity of the tyre.
Balloon tyres require much less pressure due to the surface area inside the tyre for correct inflation.
If we reduce the area for air inside the tyre you have to increase the pressure to maintain the correct footprint for that tyre.
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Old 18-03-2011, 06:12 PM   #7
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Default Re: Tyre Pressures !

Thanx for your info guys !
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Old 18-03-2011, 09:00 PM   #8
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Default Re: Tyre Pressures !

I run 243/35/19 tyres on my car with 42psi. Max on tyre says 48.
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Old 18-03-2011, 09:44 PM   #9
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Default Re: Tyre Pressures !

Quote:
Originally Posted by jsk710
Hate to think how much they are a shot........
They retail around $450 or so per tyre and 40 psi is a pretty good pressure for those tyres
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Old 18-03-2011, 11:42 PM   #10
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Default Re: Tyre Pressures !

I had 40 psi in mine. After the last visit to the service department, they dropped themselve to 32psi
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Old 18-03-2011, 11:45 PM   #11
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Default Re: Tyre Pressures !

Yep I have my 19's at 39psi, seems to be wearing even. I had them at 43 when I first got them, felt really smooth on a good road but the middle was wearing a bit fast.
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Old 19-03-2011, 10:42 AM   #12
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Default Re: Tyre Pressures !

42 Lb on my 17's .. A few quick sprints and the pressure goes up ...
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Old 19-03-2011, 10:47 AM   #13
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Default Re: Tyre Pressures !

40 pounds all round for me, I have always had nice and even wear
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Old 19-03-2011, 11:02 AM   #14
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Default Re: Tyre Pressures !

Quote:
Originally Posted by FgNewbie
I had 40 psi in mine. After the last visit to the service department, they dropped themselve to 32psi
Yes I have got fed up with my dealer lowering the tyres back to 32 the two times so far my car has been back there for visits. But surprisingly, the car was delivered new with 38psi in them. I'm just not used to people doing stuff to my car anymore when I've been servicing the previous one myself for 3-4 years.

I run 38 psi front and rear when cold. Have continually found the tyres wear evenly across the tread at that pressure.
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Old 19-03-2011, 02:57 PM   #15
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Default Re: Tyre Pressures !

Factory and dealer tyre pressure are for a comfort ride, not for enconomy or tyre life.. just bump them up.
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