Bushcrusher · Oct 30, 2018

Hi guys, do any of you know the answer to my question? I run 265x75x16 bf goodrich all terrain mud tyres on steel rims, on my discovery 1 v8 3.9. I've been told and read that the following are exceptable on a 4x4 in the following surface types
Road= 30 to 32 psi
Gravel= 26 to 32 psi
Rocks= 22 psi
Mud = 28 psi
Sand= 16 psi
Are these correct or is it more mumbo jumbo made up by a pencil neck who's closest off road experience was walking on the grass! So has anyone got the same tyres on and what pressures do you run on road and off? Tyres are bleeding expensive so don't want them to wear out before they've done 400 miles or so.
So I'm all ears
Dave

dieseldog69 · Oct 30, 2018

I run my Cooper STT at 40psi all round in summer, 30psi winter and off road, airing down as required for sand/snow/boggy ground.

Bushcrusher · Oct 30, 2018

How do you find the road handling?

neilly · Oct 30, 2018

reference driving on the orad, have a seach for the chalk test.

I run my 285 75 16 BFG MT at 30 on everything , seem to work OK.

Cheers

Bushcrusher · Oct 30, 2018

neilly said:
reference driving on the orad, have a seach for the chalk test.

I run my 285 75 16 BFG MT at 30 on everything , seem to work OK.

Cheers

Cheers for that, the chalk test? Is that the one where you mark a line across the tyre and if wears evenly you have correct psi?
Dave

Bushcrusher · Oct 30, 2018

Neilly what is the orad lol

neilly · Oct 30, 2018

Bushcrusher said:
Cheers for that, the chalk test? Is that the one where you mark a line across the tyre and if wears evenly you have correct psi?
Dave

Yep, that is the chalk test.

The orad is a special item only available for Discovery owners who are in the club and know the speshul wink and nod routine..

If you have to ask....then......

.

Cheers

Bushcrusher · Oct 30, 2018

dieseldog69 said:
I run my Cooper STT at 40psi all round in summer, 30psi winter and off road, airing down as required for sand/snow/boggy ground.

Neilly runs his at 30 to so that's a positive sign. So 30 it is
Cheers bud

Bushcrusher · Oct 30, 2018

neilly said:
Yep, that is the chalk test.

The orad is a special item only available for Discovery owners who are in the club and know the speshul wink and nod routine..

If you have to ask....then.......

Cheers

oh that orad! But of course

neilly · Oct 30, 2018

Bushcrusher said:
Neilly runs his at 30 to so that's a positive sign. So 30 it is
Cheers bud

Just because I do, does not mean it is right....LOL.........

Cheers

neilly · Oct 30, 2018

Darn it, now I got to go check my tyre pressures.......

Back in a while.

Cheers

Bushcrusher · Oct 30, 2018

Well I will raid my wife's craft box borrow some chalk and see how it goes. . Dieseldog69 runs his at 30 in winter so seems to be the average

Bushcrusher · Oct 30, 2018

Bushcrusher said:
Well I will raid my wife's craft box borrow some chalk and see how it goes. . Dieseldog69 runs his at 30 in winter so seems to be the average

Bushcrusher · Oct 30, 2018

OK fella catch you l8r. Hope them tyres be cold!

dieseldog69 · Oct 30, 2018

Bushcrusher said:
Well I will raid my wife's craft box borrow some chalk and see how it goes. . Dieseldog69 runs his at 30 in winter so seems to be the average

I loikes em 'ard in the summer for better MPGs and softer in winter for increased sidewall flex and greater footprint, mostly personal preference but suits me

Bushcrusher · Oct 30, 2018

OK fella really appreciate your response I will give it go . And do the chalk test neilly mentioned. I had heard of it before, but due to old age setting in andiscovery a crap memory since I high sided my hayabusa and landed on me head back in 2009 me not remember much. What we talking about anyway?

Bushcrusher · Oct 30, 2018

By the way the busa thing is true. Hurt like a barsteward!

neilly · Oct 30, 2018

Well, that was fortunate.

Just went and checked, all at 30PSI, but on undoing one of the caps I could hear air escaping, seems the valve was right on the edge of being tight and had come a little loose when I removed the cap.

So after a search for the valve tool I know I have and not being able to find it, off to halfords £6 lighter for a valve tools and a 4 pack of valve cores just in case. Now I need to put air in that corner....LOL.

Cheers

Bushcrusher · Oct 30, 2018

That was lucky m8, Jesus I've had similar happen to me on a rice rocket. And it 2 as the bloody front one. All I can say is thank you to that cow who gave it's life to save mine!
Now you know why I've gone to 4 wheels instead of 2.

brian47 · Oct 30, 2018

Somebody mentioned reducing the pressures on snow or mud. That's not advisable because of what happens to the tyre at the bit that really matters, the bit in contact with the ground. The tread can start to go concave and the tread pattern can close up thereby reducing the efficiency of the tyre.
Proof that the tread of the tyre does actually go concave can be seen when a tyre which has been under-inflated wears the tread on both outside edges of the tread.
Tyres for normal vehicles should be operated at either the manufacturer's specified pressures or the pressure found by experimentation using a technique such as "the chalk test".
The myth about reducing the tyre pressure came about after those Icelandic off-roaders were seen doing just that on a snowfield, but if you check carefully the tyres are more like balloon type tyres with tractor tyre tread patterns which probably normally operate at pressures of 10 to 15 psi.

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