Tyre pressures ( Old Cherry !! )

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H

Hirsty's

Guest
I always have trouble with tyre pressures for 110 CSW 1998 with 235 BFG.
Does'nt seem to be anywhere to get a definative answer. However I did see a
site where it showed a formula based on nthe tyres proprtties and the load
of the vehicle that allowed youy to calciulate the correct pressure. Would
anybody know of thos formula that I could use ?/

JoH

--


" ..... it is the provenence of knowledge to speak, and it is the privelage
of wisdom to listen"


 

"Hirsty's" <[email protected]> wrote in message
news:[email protected]...
>I always have trouble with tyre pressures for 110 CSW 1998 with 235 BFG.
> Does'nt seem to be anywhere to get a definative answer. However I did see
> a
> site where it showed a formula based on nthe tyres proprtties and the load
> of the vehicle that allowed youy to calciulate the correct pressure. Would
> anybody know of thos formula that I could use ?/
>
> JoH

My old 110 had same size tyres & the book said rears should be 42 psi. That
is way too high, I ran them at 32 front, 32 rear & it drove really well with
no odd trye wear.

My P38 has 18 inch 255's & the fronts are supposed to be 28 & rears 38. 28
on the fronts is too soft. I have run them at 30 for ages with no odd wear.

Nige


 
On or around Mon, 3 Apr 2006 12:33:47 +0100, "Nige"
<[email protected]> enlightened us thusly:

>
>"Hirsty's" <[email protected]> wrote in message
>news:[email protected]...
>>I always have trouble with tyre pressures for 110 CSW 1998 with 235 BFG.
>> Does'nt seem to be anywhere to get a definative answer. However I did see
>> a
>> site where it showed a formula based on nthe tyres proprtties and the load
>> of the vehicle that allowed youy to calciulate the correct pressure. Would
>> anybody know of thos formula that I could use ?/
>>
>> JoH
>
>My old 110 had same size tyres & the book said rears should be 42 psi. That
>is way too high, I ran them at 32 front, 32 rear & it drove really well with
>no odd trye wear.
>
>My P38 has 18 inch 255's & the fronts are supposed to be 28 & rears 38. 28
>on the fronts is too soft. I have run them at 30 for ages with no odd wear.

The book says 28 for disco I fronts, and if you do that they wear on the
edges, just like an underinflated tyre...

been running 36 in front and rear (except if heavily laden) for ages in
discos and the tyres wear just about as even as you can get on
steering-driving ones.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Satisfying: Satisfy your inner child by eating ten tubes of Smarties
from the Little Book of Complete B***ocks by Alistair Beaton.
 
Nearly all the weight is on the front - unless you carry loads or are
towing. If anything I would say the back needs be no more than the front on
an unladen vehicle.

One old trick is to paint a white stripe across your tyres - you can then
see where it wears off first - middle - over inflated - edges under
inflated.


"Hirsty's" <[email protected]> wrote in message
news:[email protected]...
> I always have trouble with tyre pressures for 110 CSW 1998 with 235 BFG.
> Does'nt seem to be anywhere to get a definative answer. However I did see
a
> site where it showed a formula based on nthe tyres proprtties and the load
> of the vehicle that allowed youy to calciulate the correct pressure. Would
> anybody know of thos formula that I could use ?/
>
> JoH
>
> --
>
>
> " ..... it is the provenence of knowledge to speak, and it is the
privelage
> of wisdom to listen"
>
>


 
Austin Shackles came up with the following;:
> On or around Mon, 3 Apr 2006 12:33:47 +0100, "Nige"
> <[email protected]> enlightened us thusly:
>
>>
>> "Hirsty's" <[email protected]> wrote in message
>> news:[email protected]...
>>> I always have trouble with tyre pressures for 110 CSW 1998 with 235 BFG.
>>> Does'nt seem to be anywhere to get a definative answer. However I did
>>> see a
>>> site where it showed a formula based on nthe tyres proprtties and the
>>> load of the vehicle that allowed youy to calciulate the correct
>>> pressure. Would anybody know of thos formula that I could use ?/
>>>
>>> JoH
>>
>> My old 110 had same size tyres & the book said rears should be 42 psi.
>> That is way too high, I ran them at 32 front, 32 rear & it drove really
>> well with no odd trye wear.
>>
>> My P38 has 18 inch 255's & the fronts are supposed to be 28 & rears 38.
>> 28 on the fronts is too soft. I have run them at 30 for ages with no odd
>> wear.
>
> The book says 28 for disco I fronts, and if you do that they wear on the
> edges, just like an underinflated tyre...

Empirical data, I know, but I'd agree completely. 28 is under-inflated for
most road-going situations. We drop to about 15/20 ish when off-roading and
to about 26/28 ish for snowy/slushy weather, which seems to help a lot.

> been running 36 in front and rear (except if heavily laden) for ages in
> discos and the tyres wear just about as even as you can get on
> steering-driving ones.

LOL, small world. I do exactly the same for everyday useage, 'cept when
towing and heavily laden when I up the pressure to 40 ish at the rear and 38
ish at the front. As we tow most weekends through summer I'm forever
getting the compressor out, and am toying with the idea of a plumbed in
affair.

I run 31 x 105 BFG AT's though, which seem to work well at almost any
pressure.

--
Paul ...
(8(|) Homer Rules ..... Doh !!!


 
Hirsty's wrote:
> I always have trouble with tyre pressures for 110 CSW 1998 with 235 BFG.
> Does'nt seem to be anywhere to get a definative answer. However I did see a
> site where it showed a formula based on nthe tyres proprtties and the load
> of the vehicle that allowed youy to calciulate the correct pressure. Would
> anybody know of thos formula that I could use ?/

That formula based on max loading/pressure reduced in a linear fashion
to your actual loading is a passable starting point but is inaccurate
enough to be dangerous when used for a lightly laden vehicle.

My professional opinion (a number of years spent selling tyres) is 32 -
34 PSI front and 30 - 32 PSI rear unladen, going on up to 44+PSI rear
when heavily laden.

--
EMB
 
EMB wrote:

> Hirsty's wrote:
>> I always have trouble with tyre pressures for 110 CSW 1998 with 235 BFG.
>> Does'nt seem to be anywhere to get a definative answer. However I did see
>> a site where it showed a formula based on nthe tyres proprtties and the
>> load of the vehicle that allowed youy to calciulate the correct pressure.
>> Would anybody know of thos formula that I could use ?/
>
> That formula based on max loading/pressure reduced in a linear fashion
> to your actual loading is a passable starting point but is inaccurate
> enough to be dangerous when used for a lightly laden vehicle.
>
> My professional opinion (a number of years spent selling tyres) is 32 -
> 34 PSI front and 30 - 32 PSI rear unladen, going on up to 44+PSI rear
> when heavily laden.
>

Interestingly the Australian supplement for my 110 lists higher pressures
than the English manual (same tyres), varying with both load and speed from
35/35 to 60/65 for loads over 1 tonne and speeds over 120kph. I find that I
get best results using 35/35 lightly loaded, 40/55 fully loaded, speeds
normally no more than 110kph.
JD
 
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