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post #1 of 4 (permalink) Old 06-20-05, 07:01 PM
Billy
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Air pressure with new rims and tires

What is the correct way, to find the optimal air pressure of tires, once you
change the size of the Rims?
I took off the standard 16 inch rims and tires on my 02 S-type and went
with 245 40zr 18 tires. According to the place that put these tires on, the
overall dimension did not change, but I assume I can no longer reference the
owners manual for air pressure, and the psi listed on the tire is for
maximum, not optimal pressure. Thanks for your help

Billy




 
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post #2 of 4 (permalink) Old 06-21-05, 03:01 AM
Phil
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Re: Air pressure with new rims and tires

The optimum way is with a tyre temperature gauge - when running at or
near your top speed the temperature should be equal across the tread
width. Overinflation makes the centre of the tread hotter,
underinflation makes the edges hotter. Pressures should be increased
slightly (5%) for extended high speed running or greater load carrying.

 
post #3 of 4 (permalink) Old 06-21-05, 08:01 AM
Billy
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Re: Air pressure with new rims and tires


"Phil" <philip_barton.geo@yahoo.com> wrote in message
news:1119343881.617939.209190@g47g2000cwa.googlegroups.com...
> The optimum way is with a tyre temperature gauge - when running at or
> near your top speed the temperature should be equal across the tread
> width. Overinflation makes the centre of the tread hotter,
> underinflation makes the edges hotter. Pressures should be increased
> slightly (5%) for extended high speed running or greater load carrying.



Humm, I think that method may be more in depth than I'm willing to go, and
it sounds like you are talking about optimum as in tyre life and tread wear.
I was thinking optimum as in braking, steering, and ride comfort, I don't
know if there is a difference between the two. Thanks for your response,
Billy


 
post #4 of 4 (permalink) Old 06-21-05, 10:01 AM
Chris Booth
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Re: Air pressure with new rims and tires

Suggest U go to tyre manufacturers web site?

Chris B
"Billy" <nevermind@cox.net> wrote in message
news:erVte.2686$Lr4.2129@fed1read03...
>
> "Phil" <philip_barton.geo@yahoo.com> wrote in message
> news:1119343881.617939.209190@g47g2000cwa.googlegroups.com...
> > The optimum way is with a tyre temperature gauge - when running at or
> > near your top speed the temperature should be equal across the tread
> > width. Overinflation makes the centre of the tread hotter,
> > underinflation makes the edges hotter. Pressures should be increased
> > slightly (5%) for extended high speed running or greater load carrying.

>
>
> Humm, I think that method may be more in depth than I'm willing to go, and
> it sounds like you are talking about optimum as in tyre life and tread

wear.
> I was thinking optimum as in braking, steering, and ride comfort, I don't
> know if there is a difference between the two. Thanks for your response,
> Billy
>
>


 
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