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proper tire inflation?



 
 
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  #1  
Old January 15th 04, 03:30 AM
4000 psi
external usenet poster
 
Posts: n/a
Default proper tire inflation?

well i finally got the Michelin Cross Terrain 255/60/17 to replace the stock
Michelin LTX M/S 245/65/17 ... first impression is: they are great!

i feel like i got a pretty good deal on them at Tire Rack ($120 delivered)
and the dealer did the mount and install for $54.16 for all 4 tires ... i
could not believe that the dealer actually had the best deal on install ...

on the way home i checked the tire pressure and it ranged in the upper 30's
PSI in all 4 tires (not cold) ... has the dealer over-inflated the tires?

what is a good way of figuring out the approproriate inflation pressure for
this size tire on an infiniti QX4?






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  #2  
Old January 15th 04, 04:00 AM
Roger Brown
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Posts: n/a
Default

4000 psi wrote:
>
> well i finally got the Michelin Cross Terrain 255/60/17 to replace the stock
> Michelin LTX M/S 245/65/17 ... first impression is: they are great!
>
> i feel like i got a pretty good deal on them at Tire Rack ($120 delivered)
> and the dealer did the mount and install for $54.16 for all 4 tires ... i
> could not believe that the dealer actually had the best deal on install ...
>
> on the way home i checked the tire pressure and it ranged in the upper 30's
> PSI in all 4 tires (not cold) ... has the dealer over-inflated the tires?
>
> what is a good way of figuring out the approproriate inflation pressure for
> this size tire on an infiniti QX4?


You are not all that different a size tire than stock, so the factory pressures listed in the Owner's Manual would be a good place to start. Here are some ideas you might try if you want to experiment a little from the
http://www.4crawler.com/Diesel/Tires...roperInflation

--
Roger
  #3  
Old January 15th 04, 04:00 AM
Roger Brown
external usenet poster
 
Posts: n/a
Default

4000 psi wrote:
>
> well i finally got the Michelin Cross Terrain 255/60/17 to replace the stock
> Michelin LTX M/S 245/65/17 ... first impression is: they are great!
>
> i feel like i got a pretty good deal on them at Tire Rack ($120 delivered)
> and the dealer did the mount and install for $54.16 for all 4 tires ... i
> could not believe that the dealer actually had the best deal on install ...
>
> on the way home i checked the tire pressure and it ranged in the upper 30's
> PSI in all 4 tires (not cold) ... has the dealer over-inflated the tires?
>
> what is a good way of figuring out the approproriate inflation pressure for
> this size tire on an infiniti QX4?


You are not all that different a size tire than stock, so the factory pressures listed in the Owner's Manual would be a good place to start. Here are some ideas you might try if you want to experiment a little from the
http://www.4crawler.com/Diesel/Tires...roperInflation

--
Roger
  #4  
Old January 15th 04, 04:49 AM
4000 psi
external usenet poster
 
Posts: n/a
Default

i did the math according to this link and the pressure comes out to be about
20 psi for the load that i have ... can i seriously run the pressure that
low?

"Roger Brown" > wrote in message
...
> 4000 psi wrote:
> >
> > well i finally got the Michelin Cross Terrain 255/60/17 to replace the

stock
> > Michelin LTX M/S 245/65/17 ... first impression is: they are great!
> >
> > i feel like i got a pretty good deal on them at Tire Rack ($120

delivered)
> > and the dealer did the mount and install for $54.16 for all 4 tires ...

i
> > could not believe that the dealer actually had the best deal on install

....
> >
> > on the way home i checked the tire pressure and it ranged in the upper

30's
> > PSI in all 4 tires (not cold) ... has the dealer over-inflated the

tires?
> >
> > what is a good way of figuring out the approproriate inflation pressure

for
> > this size tire on an infiniti QX4?

>
> You are not all that different a size tire than stock, so the factory

pressures listed in the Owner's Manual would be a good place to start. Here
are some ideas you might try if you want to experiment a little from the
> http://www.4crawler.com/Diesel/Tires...roperInflation
>
> --
> Roger



  #5  
Old January 15th 04, 04:49 AM
4000 psi
external usenet poster
 
Posts: n/a
Default

i did the math according to this link and the pressure comes out to be about
20 psi for the load that i have ... can i seriously run the pressure that
low?

"Roger Brown" > wrote in message
...
> 4000 psi wrote:
> >
> > well i finally got the Michelin Cross Terrain 255/60/17 to replace the

stock
> > Michelin LTX M/S 245/65/17 ... first impression is: they are great!
> >
> > i feel like i got a pretty good deal on them at Tire Rack ($120

delivered)
> > and the dealer did the mount and install for $54.16 for all 4 tires ...

i
> > could not believe that the dealer actually had the best deal on install

....
> >
> > on the way home i checked the tire pressure and it ranged in the upper

30's
> > PSI in all 4 tires (not cold) ... has the dealer over-inflated the

tires?
> >
> > what is a good way of figuring out the approproriate inflation pressure

for
> > this size tire on an infiniti QX4?

>
> You are not all that different a size tire than stock, so the factory

pressures listed in the Owner's Manual would be a good place to start. Here
are some ideas you might try if you want to experiment a little from the
> http://www.4crawler.com/Diesel/Tires...roperInflation
>
> --
> Roger



  #6  
Old January 15th 04, 06:01 AM
Roger Brown
external usenet poster
 
Posts: n/a
Default

4000 psi wrote:
>
> i did the math according to this link and the pressure comes out to be about
> 20 psi for the load that i have ... can i seriously run the pressure that
> low?


You'll likely not come up with one answer or one pressure. I've run 20-22 psi in my 33x10.50 BFGs on the highway and they do OK, no signs of overheating. But for extended high speed driving, I generally run about 30 psi or higher. Start out with the
suggested inflation specs for the vehilce, often in an Owner's manual, sticker on the door jamb or glove box, etc. If that feels too soft, increase the pressure, if too firm, decrease it. Watch the tread wear and tread contact patch and come up with
something that works for you, your driving style, your vehicle and tires.

--
Roger
  #7  
Old January 15th 04, 06:01 AM
Roger Brown
external usenet poster
 
Posts: n/a
Default

4000 psi wrote:
>
> i did the math according to this link and the pressure comes out to be about
> 20 psi for the load that i have ... can i seriously run the pressure that
> low?


You'll likely not come up with one answer or one pressure. I've run 20-22 psi in my 33x10.50 BFGs on the highway and they do OK, no signs of overheating. But for extended high speed driving, I generally run about 30 psi or higher. Start out with the
suggested inflation specs for the vehilce, often in an Owner's manual, sticker on the door jamb or glove box, etc. If that feels too soft, increase the pressure, if too firm, decrease it. Watch the tread wear and tread contact patch and come up with
something that works for you, your driving style, your vehicle and tires.

--
Roger
  #8  
Old January 16th 04, 09:36 AM
rnf2
external usenet poster
 
Posts: n/a
Default


"Roger Brown" > wrote in message
...
> 4000 psi wrote:
> >
> > i did the math according to this link and the pressure comes out to be

about
> > 20 psi for the load that i have ... can i seriously run the pressure

that
> > low?

>
> You'll likely not come up with one answer or one pressure. I've run 20-22

psi in my 33x10.50 BFGs on the highway and they do OK, no signs of
overheating. But for extended high speed driving, I generally run about 30
psi or higher. Start out with the
> suggested inflation specs for the vehilce, often in an Owner's manual,

sticker on the door jamb or glove box, etc. If that feels too soft,
increase the pressure, if too firm, decrease it. Watch the tread wear and
tread contact patch and come up with
> something that works for you, your driving style, your vehicle and tires.
>
> --
> Roger



  #9  
Old January 16th 04, 09:36 AM
rnf2
external usenet poster
 
Posts: n/a
Default


"Roger Brown" > wrote in message
...
> 4000 psi wrote:
> >
> > i did the math according to this link and the pressure comes out to be

about
> > 20 psi for the load that i have ... can i seriously run the pressure

that
> > low?

>
> You'll likely not come up with one answer or one pressure. I've run 20-22

psi in my 33x10.50 BFGs on the highway and they do OK, no signs of
overheating. But for extended high speed driving, I generally run about 30
psi or higher. Start out with the
> suggested inflation specs for the vehilce, often in an Owner's manual,

sticker on the door jamb or glove box, etc. If that feels too soft,
increase the pressure, if too firm, decrease it. Watch the tread wear and
tread contact patch and come up with
> something that works for you, your driving style, your vehicle and tires.
>
> --
> Roger



  #10  
Old January 16th 04, 09:37 AM
rnf2
external usenet poster
 
Posts: n/a
Default


"Roger Brown" > wrote in message
...
> 4000 psi wrote:
> >
> > i did the math according to this link and the pressure comes out to be

about
> > 20 psi for the load that i have ... can i seriously run the pressure

that
> > low?

>
> You'll likely not come up with one answer or one pressure. I've run 20-22

psi in my 33x10.50 BFGs on the highway and they do OK, no signs of
overheating. But for extended high speed driving, I generally run about 30
psi or higher. Start out with the
> suggested inflation specs for the vehilce, often in an Owner's manual,

sticker on the door jamb or glove box, etc. If that feels too soft,
increase the pressure, if too firm, decrease it. Watch the tread wear and
tread contact patch and come up with
> something that works for you, your driving style, your vehicle and tires.
>
> --
> Roger


offroad on sand and mud you can go down to 8 PSI on Troopers (31x10.5 R15)
for a period.



 




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