tyre pressure

Interesting information on the Defender - the 110 County has quite detailed figures, varying with load and speed, and another set for off road, soft conditions.

Varies on road from 35/35 empty below 100kph up to 55/65 fully loaded and above 120kph. I find that 35/35 is good for normal driving empty, and up it to 45/55 fully loaded.

Tyre pressures are always a compromise. Low side is set by damage to tyres, high by ride, and then there is the handling issue - the pressure relative to the load affects the slip angle, and it is usually preferred for the rear to have a better grip than the front; hence the higher pressures unloaded. Not sure why the County has the same pressures front and rear unloaded, but the heavy engine may be a factor or possibly the different tyres, although while that might change the overall pressure slightly, I don't see how it would change the ratio front to back. Most likely the compromises between tyre life, ride and handling have been reassessed, perhaps in response to urging from their insurers!

John

I ran the recomended pressures on an outback trip( high speed dirt roads) and the General Grabbers on the rear chipped very badly, with my current tyres which are a lot bigger lugged(muddies) I run them at 32 psi front and rear, loaded or not, and have experienced no chipping or dramas on high speed dirt driving, of which I have done a bit of late.

Interesting, and I will continue to run what I do, as it suits. I have found that with too much air in rear it rides too harsh. FWIW, I don't high speed drive anywhere (personal choice, and no criticism meant or intended) especially on dirt/gravel, and actually slow down and reduce pressures on dirt/gravel. I have experienced chipping on the Grabbers as well, even at the pressures I run, so I reckon it's a tyre thing.

With the Stage 1 and 750/16 Duellers, I ran 36 all round as well, and always got at least 80000 k's from them.

There is a sticker on the bodywork just under neath the rear drivers side passenger seat that states 28psi in the front and 48psi in the rear. Intersetingly, no matter what you believe and what the tyre dealers tell you, if you have an accident and the police or insurance company test your pressures and they are grossly different to what the manufacturer says, you may be found liable. Ie no insurance payout and/or a prosecution. You have been warned!:wasntme:

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Originally Posted by foz.in.oz

There is a sticker on the bodywork just under neath the rear drivers side passenger seat that states 28psi in the front and 48psi in the rear. Intersetingly, no matter what you believe and what the tyre dealers tell you, if you have an accident and the police or insurance company test your pressures and they are grossly different to what the manufacturer says, you may be found liable. Ie no insurance payout and/or a prosecution. You have been warned!:wasntme:

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Personally I believe this is bollocks, because there are too many variables involved.

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Originally Posted by numpty

Interesting, and I will continue to run what I do, as it suits. I have found that with too much air in rear it rides too harsh. FWIW, I don't high speed drive anywhere (personal choice, and no criticism meant or intended) especially on dirt/gravel, and actually slow down and reduce pressures on dirt/gravel. I have experienced chipping on the Grabbers as well, even at the pressures I run, so I reckon it's a tyre thing.

With the Stage 1 and 750/16 Duellers, I ran 36 all round as well, and always got at least 80000 k's from them.

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sorry my mistake,when i say high speed dirt, I'm talking 80 -100kmh dirt roads.;)

Yeah, my speed would be no more than 80 on most dirt roads.

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Originally Posted by numpty

Personally I believe this is bollocks, because there are too many variables involved.

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the overall statement foz.in.oz made is true unfortunately going by what i have seen and read.

i have been investigating other issues like tow hitches and load levelers amongst other things and it is obvious beyond all doubt that insurance companies, and more worrying to me, coroners, are apportioning blame / handing down reports more heavily based on manufacturers recommendations (and there are some rippers when it comes to towing.) Coroners have some truly amazing powers, way more than i imagined was the case.... and it appears they are very inclined to enforce manufacturers labels in recent history.