Tyre Pressures

Submitted: Saturday, Oct 15, 2005 at 10:57
ThreadID: 27277 Views:3051 Replies:3 FollowUps:0
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Hello

I have a 2003 3.0L Nissan Patrol, it originally came with Bridgestone Dueller 693, 265/70 R16 tyres with a recommended running pressure of around 30-32psi. I have since upgraded to Bridgestone 694 LT285/75 R16 which I was told by the tyre fitter to run at 36psi. At this pressure they ride like an empty dump-truck, dropping the pressures back down to 32psi has resulted in a much better ride, however I don't want to risk tyre damage, there doesn't seem to be any signs of irregular wear although I have only run them at this pressure for a month or so. Does anyone have any similar experience in this area?
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Reply By: Sand Man (SA) - Saturday, Oct 15, 2005 at 11:11

Saturday, Oct 15, 2005 at 11:11
Snowy,

If they "feel" right at 32psi and you can pass the 4psi rule then they are about right.
Drive the vehicle for a while until the tires have reached operating temperature, then measure the pressure.
If the pressure is 4psi higher than what they were cold, they are spot on.
If the pressure is more than 4psi difference the tires are under inflated. Add air.
If the pressure is less than 4psi difference the tires are over inflated. Remove air.

This will give you optimum performance and optimum wear throughout the life of the tires.
Bill


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AnswerID: 134711

Reply By: Wayne (NSW) - Saturday, Oct 15, 2005 at 11:16

Saturday, Oct 15, 2005 at 11:16
Snowy,
Everyone has there own thoughts about tyre pressure, but if the vehicle is empty that the lower pressure would be fine. If the vehicle is loaded up that the tyre pressure will have to go up a bit, 36psi could be it.

The way to set the tyre pressure is the 4psi rule.
1. Using a good tyre pressure gauge, I find the dial type the best, and set all the tyres at say 34psi.
2. Drive the vehicle on the open road at 80km/h for 30min
3. Stop and check the tyre pressure, if it has gone up by more that 4psi the tyre pressure is too low. The tyre wall is flexing and that causes heat and that will cause the tyre pressure to go up.
If the tyre pressure does not rise any more that 4psi that that is the right tyre pressure for that brand of tyres on that vehicle at that weight.
I hope that makes sense

Wayne
AnswerID: 134712

Reply By: MichaelN - Sunday, Oct 16, 2005 at 08:25

Sunday, Oct 16, 2005 at 08:25
It was mentioned in a recent post that most servo pressure guages are not that accurate. 32psi on their guage could infact be 36psi !. Get digital pressure guage of your own so your readings are always the same. Also, you will get your best fuel economy at the highest safe pressure for your tires.

Michael.
AnswerID: 134777

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