Tyre pressures

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38 - 40, manufacturers recommendation.
Regards, Clive.
On 5/27/05, Peter Browning <[Email address removed]> wrote:
re
 
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Hi All,
My FJ40 has aftermarket wheels and tyres and I haven't a clue what the tyre
pressures should be, I've been keeping them at between 30 - 32 PSI which
seems sensible.
The tyres are:
Bridgestone Dueler A/T
On the side of the tyre it also says:
31 x 10.50R15LT 6PR 109S 691
It also says to never exceed 40PSI (no shit Sherlock). They were made in
Indonesia.
Does the '31' mean that they are 310's (width), and if so what does all the
other stuff mean. Also does anyone know if the tyres are good ones?
I have 'Googled' the tyre but can't seem to find much help...help!
Steve Ackhurst - FJ40
E: [Email address removed]
 
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Well...
The 31 is the diameter of the tyre in inches.
The 10.50 is the width of the tread in inches (i.e. 10 1/2 inches)
The 15 is the diameter of the wheel it fits, again in inches.
So it's a 31" dia tyre, 10 1/2 inches wide and fits onto a 15" diameter rim.
S is the speed rating I think, though I don't know what actual rating
the 'S' refers to
The rest, don't know.
Pete
Steve Ackhurst wrote:
 
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Tim wrote....
I have trawled through the last 2700 messages to try to find notes on tyre
pressures but without success. I remember a posting on pressures when running
BF Goodrich All Terrain tyres.
Can anyone offer advise for general road use with normal loads as I can't seem
to find details on any websites.
Tim Maw
SNIP
Sorry Tim but perhaps my last posting on the subject was
number 2701, on 27 October 2005 I wrote......
"I apologise in advance to other listers who will now be bored with
my explanation of the 4psi rule that I have posted a couple of times
before, but it may help you Steve.
The manufacturer's calculated optimum pressures when warm are nearly
always 4psi above the recommended pressure when cold. You inflate to
32 cold, and when warm they are 36psi, and that's where the
manufacturer wants them to be.
So if in doubt, set them to 32 early in the morning before it gets
any heat of the day, go for a ride for half an hour, and not in
stop-go traffic but continuous travelling, and with an 'average' load
for your daily driving. Then test the pressure. If its 36 then you
have it right. If its 38 then it should be set to 34 cold for those
loading conditions. Likewise if its 34 when warm, then you should run
at 30psi cold. But in summer when its hot and you are going on a long
high speed drive then inflate the rears more to get the best fuel
consumption etc. The only exception I have found is when it gets very
- 40 degs - hot in (the Bosnian Mediterranean) summer the fronts tend
to squeal on tight corners and I put another 2psi in to quieten them."
Tim, this works for any tyre on any car or 4WD and is a method used
by the military and others who regularly vary their loadings. HTH
Cheers
Jon
Ting,Herts
'92 HZJ80 ex UN Bosnia surplus
 
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Time for me to pitch in. When I bought Goodrich tyres for the cruiser
I phoned the Goodrich importer (I think), whoever it was they told me
they had every tyre sold in the UK there. I had gone from 275's to
285's and the guy said they were almost truck tyres run them at 40 psi
all round. He even guessed right at the recommended for standard.
Regards,
Clive Marks
Home: +44 1293 514600
Mobile: +44 7821 491897
Skype: Cobminor
Crawley, West Sussex, UK.
 
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I know this is probably a topic that has been done to death, but I'd be
interested in any thoughts.
I run the standard 275/70R16 tyres (Dunlop Grand Trek) and I've noticed
that my front tyres wear more at the edges, and my rears more at the
centre.
Historically I've run then at 32 psi front and back, since this is what
the handbook says, but I've come to the view that this is probably wrong
given the wear patterns. So I've changed to 36 psi front and 28 psi
rear in order to try to get more even wear. It's too early to say
whether this has made much difference (I tend to get about 30+k miles
out of the tyres.)
OK, I know I should rotate them, but I can't be bothered, and it also
means that they all wear out at once which is a lot of money! So is
there anyone else out there who is
(a) lazy about tyre rotation
(b) running on the 275/70 tyres
Who has done anything similar?
Christopher Bell
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Hi Christopher
Mine are a little different being the 285/75s but i fill to about 40psi and
this has ensured an even wear and stops the tyres from having too much side
wall flexing which they did at lower psi.
john 92HDJ 80 1HDT
 
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CB
For small money your local tyre guy will rotate them for you.
In addition to the advantages Julian pointed out by doing this - it
also gives you a chance to check wheel bearings for play, break pads
for wear, bushings on shocks, oil and fluid leaks etc etc
Worth the effort.....
Safety first
Niall
 
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Niall
I have it serviced every 5000 miles (since that is the oil change interval) at a local garage, which works out at every 6 months. I don't have a ramp or pit, and it's easier to pay someone else to do it!
At the (minor, nominally "oil change") service I get them to put it up on a ramp, inspect all the running gear visually and fix anything that needs doing; at the major one (yearly) all the wheels come off, all fluids are checked, etc, etc.
I think 5k miles / 6 months is adequate maintenance for my sort of use given that it's now 12 years old - and yes, I do check the (accessible) fluids and tyres more frequently!
I'd rather use them than a tyre place, since the latter would "point out what's wrong guv" but not fix it, whereas this garage has got the hang of me now and has a pretty good idea of what I do and don't want them to do. It costs about an extra =A3100 year, but I think it's worth it.
Maybe I should ask them to rotate the tyres as well, but I've never seen the point if the wear is even. I'll ask them what they think next time I'm in there.
CB
|
| > (a) lazy about tyre rotation
|
| For small money your local tyre guy will rotate them for you.
|
| In addition to the advantages Julian pointed out by doing this - it
| also gives you a chance to check wheel bearings for play, break pads
| for wear, bushings on shocks, oil and fluid leaks etc etc
|
| Worth the effort.....
|
| Safety first
|
| Niall
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