Tyre Pressure

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gsgtsg

New Member
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42
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Hi,

I have just had a set of four new tyres on my Discovery 2 year 2000. These are the General Grabber AT2 (255/55 R18) tyres.

Please advise what the tyre pressure should be for the front and back when used on road/moterway?

Thanks.
 
gsgtsg said:
Hi,

I have just had a set of four new tyres on my Discovery 2 year 2000. These are the General Grabber AT2 (255/55 R18) tyres.

road/moterway?
Click to expand...


yer spelin is crap ......its mowterway..... ffs .... dunt ya no nuffin..??
 
Feel dutybound to answer this one as I asked same question a week ago but nobody would speak to me...I'm not bitter though...You swines, you absolute swines! Ahem. Anyway, book sez, 28psi front and 38psi rear for yer normal size tyres....I fink. That's what I did for me motowahaay travel. :cool:
 
sp33der said:
Feel dutybound to answer this one as I asked same question a week ago but nobody would speak to me...I'm not bitter though...You swines, you absolute swines! Ahem. Anyway, book sez, 28psi front and 38psi rear for yer normal size tyres....I fink. That's what I did for me motowahaay travel. :cool:
Click to expand...

Hi sp33der, I'll talk to you :D :D

If you are running on smooth (mowterweigh) roads for most of the time, you may be interested to know that you can raise the front tyre pressures to 38 as well - it helps with fuel economy.

If on rougher roads, then they can get a bit crashy, when over-inflated.

Cheers

Dave
 
thebiglad said:
Hi sp33der, I'll talk to you :D :D

If you are running on smooth (mowterweigh) roads for most of the time, you may be interested to know that you can raise the front tyre pressures to 38 as well - it helps with fuel economy.

If on rougher roads, then they can get a bit crashy, when over-inflated.

Cheers

Dave
Click to expand...
I'm slightly concerned - how legal is it to run with tyres over-inflated to that extent? It ought to cause you to understeer a fair bit as well.

Rear tyres btw should go up to 48 when loaded. It's all in the handbook.
 
"Correct tyre pressures are vital for balanced braking, maximum grip and maximum tyre life.

Recommended pressures may vary according to load or speed. Look in the Vehicle Handbook, or consult your garage or tyre dealer.

Wrong Tyre Pressures (high or low) will cause more rapid wear and shorter tyre life.
Low Tyre Pressures also cause increased fuel consumption and consequently increased air pollution.
Higher than necessary pressures may give an uncomfortable ride and reduce grip due to the smaller area in contact with the road.

Pressures should be checked at least every two weeks and when the tyres are cold. Even a short trip to the local garage will warm up the tyre and raise the pressure. Accurate and reliable gauges are not expensive and will soon pay back their cost.



Page Created by: Traffic Accident Reduction Unit, Civic Offices, Knoll Street, Cleethorpes, DN35 8LN"
From:
Tyre Laws
Correct pressures for Disco 2 are 28F 38R, or 28F 48R when loaded
 
PASTMASTER said:
I'm slightly concerned - how legal is it to run with tyres over-inflated to that extent? It ought to cause you to understeer a fair bit as well.

Rear tyres btw should go up to 48 when loaded. It's all in the handbook.
Click to expand...

According to my book the tyre pressures can be as follows:

Normal Use Front Rear

205/80 R 16 1.9 bar (28psi) 2.6 bar (38psi)
235/70 R 16 1.8 bar (26psi) 2.3 bar (33psi)

Off-Road Use

All tyres 1.2 bar (17psi) 1.8 bar (26psi)


Also bear in mind the generally-accepted advice which states increase tyre pressures all round by 3 psi if travelling at a constant motorway speed.

So you can see that the latitude regarding tyre pressures is quite large depending on the above factors. If you were to take into account temperature variations, the issue becomes ever more complicated. Do we even acknowledge temperature when checking tyres? The book always says check pressures when tyres are cold - what temp is cold??

Currently my car lives outdoors and yesterday it stood in 40° C sunshine, was that cold??

Most garages round here would advise 2.5 front & rear, partially due to the nature of our bumpy country roads.

"Over-inflated" tyres do not in themselves create handling problems so long as they are equal on both sides of the vehicle, imho.

Just a few random thoughts, you understand

Cheers
Dave
 
Is that the TDi handbook Dave? My TD5 manual (1999) says:

All tyres (normal conditions) F 28lb/1.9bar R 38lb/2,6bar.

All tyres (vehicle loaded to max GVW) F28lb/1.9 bar R 48lb/3.2 bar.

It adds that when towing it is permissible to exceed the tyre load rating by up to 15% if pressures are raised by at least 3lb/0.2bar and speed does not exceed 62mph.

There is no recommendation to lower pressures off road, either on the tyre pressure page or in the off road driving section.

If you do lower tyre pressures off-road, for example in soft sand, they must be pumped up when returing to road.

The idea of raising pressures for motorway speeds has now been discounted, I think. It was really a crossply thing. On some models, eg Freelander, putting up pressures definitely causes tyre wear: LR had to lower the original pressures on the Freelander as even 2lbs difference caused uneven wear on the back tyres (I had one at the time, and it's true!). Constant over-inflation usually leads to a wear band round the centre of the tyre.

Envy you your heat, although it's pretty hot and sticky (but also wet) here in London. Time for a trip across the channel methinks.

Oh - and tyre law here in the UK is ambiguous. Tyres must be "inflated so that they are fit for purpose". I think that's generally taken to mean in line with manufacturer's instructions.

Worst tyre story I know - a friend bought a new set of tyres for his Chevvy in the States. Took it in for service and asked them what were the correct pressures, and they quoted him the "max" pressure printed on the sidewalls. And he believed them. And the car was virtually undriveable...

(the other) Dave
 
Yep TDi handbook says 28 and 38 but doesn't mention the 48! Reason I was originally interested in people's tyre pressures is that I used to have an oldish BMW motor-sickle and the opinion held by most forum dwellers was that tyre pressures should be increased from original manufacturer's figures due to advancement in tyre technology and general experience gained over the years. I just wondered if there was any opinions among owners here as to what were the best pressures to run on. In my case I was referring to a 300TDi for normal driving and motorway cruising. I'm mildly curious too as to why the front pressures are so (relatively) low compared to the rear.
Hmmm, 40 degrees, now that's hot! Indeed London has been warm this week but so bloody humid too! My work van has no aircon. Finish a job, working in 30 odd degrees then get in the van and it's hotter. :(
 
PASTMASTER said:
Is that the TDi handbook Dave? My TD5 manual (1999) says:

All tyres (normal conditions) F 28lb/1.9bar R 38lb/2,6bar.

All tyres (vehicle loaded to max GVW) F28lb/1.9 bar R 48lb/3.2 bar.

It adds that when towing it is permissible to exceed the tyre load rating by up to 15% if pressures are raised by at least 3lb/0.2bar and speed does not exceed 62mph.

There is no recommendation to lower pressures off road, either on the tyre pressure page or in the off road driving section.

If you do lower tyre pressures off-road, for example in soft sand, they must be pumped up when returing to road.

The idea of raising pressures for motorway speeds has now been discounted, I think. It was really a crossply thing. On some models, eg Freelander, putting up pressures definitely causes tyre wear: LR had to lower the original pressures on the Freelander as even 2lbs difference caused uneven wear on the back tyres (I had one at the time, and it's true!). Constant over-inflation usually leads to a wear band round the centre of the tyre.

Envy you your heat, although it's pretty hot and sticky (but also wet) here in London. Time for a trip across the channel methinks.

Oh - and tyre law here in the UK is ambiguous. Tyres must be "inflated so that they are fit for purpose". I think that's generally taken to mean in line with manufacturer's instructions.

Worst tyre story I know - a friend bought a new set of tyres for his Chevvy in the States. Took it in for service and asked them what were the correct pressures, and they quoted him the "max" pressure printed on the sidewalls. And he believed them. And the car was virtually undriveable...

(the other) Dave
Click to expand...


Hi Dave, yes, the figures came from my Tdi 300 handbook.

On the subject of Discos and front tyre ressures I've always found that if I run at 28 psi, then the car feels very heavy on the steering almost as if it's giving the components a hard time.

If I run (which I do most of the time) @ 2.3bar , about 33 psi, then the car is much nicer to drive.

Also, if I load up the back too much ie over 2.6 bar 38psi I find that the back end starts to get very bouncy & crashy - me no likey that :)

I think the original poster was trying to encourage a debate and sharing experience in exactly the way we are doing now.

We all know that regarding vehicles, there are so many "rules" which are not exactly absolutes, but very often put there by some litigation-fearing senior manager who doesn't want to get caught out.

See my other thread re anti-rollbars for example. My car now runs Much nicer without them. Of course, I have taken the responsibility upon myself, for not turning the car over;)

My general advice would always be, try different settings and CAREFULLY monitor how the car behaves. So long as you don't go Mr Stupid, you won't get in any trouble with the law.

Cheers & Good Luck

Dave
 
thebiglad said:
My general advice would always be, try different settings and CAREFULLY monitor how the car behaves. So long as you don't go Mr Stupid, you won't get in any trouble with the law.

Cheers & Good Luck

Dave
Click to expand...
That's pretty good advice. The handbook CAN be wrong! Although in this case I think you might end up spending more on tyres.

I wonder about trouble with th'insurance though? Incorrect tyre pressures could be SAID to have caused an accident (I think it's one of thethings the police check in a serious accident) - and as for taking out the anti-roll bars, did you tell the insurers????:eek:

Just because it's the other guy's fault, doesn't mean you won't get blamed if they find something "wrong" with YOUR vehicle.

Enjoy that sun!

D
 
Actually, thinking back to my 300TDi, the steering was terrible (and was one of the reasons I got rid of it. It wandered all over the road. perhaps I should have experimented more with teh tyre pressures (in those days I naïvely believed the Stealer knew what they were talking about. Young fool that I was).
 
PASTMASTER said:
Actually, thinking back to my 300TDi, the steering was terrible (and was one of the reasons I got rid of it. It wandered all over the road. perhaps I should have experimented more with teh tyre pressures (in those days I naïvely believed the Stealer knew what they were talking about. Young fool that I was).
Click to expand...


There, there, Pastmaster, don't beat yourself up. After all, life is a learning experience:D :p :cool: :rolleyes: :eek:

At least you now know more of the truth about the much-vaunted Land Rover Network :D
 
PASTMASTER said:
That's pretty good advice. The handbook CAN be wrong! Although in this case I think you might end up spending more on tyres.

I wonder about trouble with th'insurance though? Incorrect tyre pressures could be SAID to have caused an accident (I think it's one of thethings the police check in a serious accident) - and as for taking out the anti-roll bars, did you tell the insurers????:eek:

Just because it's the other guy's fault, doesn't mean you won't get blamed if they find something "wrong" with YOUR vehicle.

Enjoy that sun!

D
Click to expand...


I do understand where you are coming from Dave, but 2 points

1. There is is rarely another vehicle in view where I live, unlike GB;

2. Getting out of bed is a risky business.

I 'm not being flippant, but I do think that it is all too easy to get into the habit of saying the large organisation must be right - they're NOT, they're just profit-scrounging market traders, so I wouldn't trust them to pay out under any circumstances anyway. In any case, there is every chance that the tyres would be damaged/punctured in an accident, wouldn't they officer??

No, for me it's the independant life, minimum insurance, fix & service it myself and stop giving money to people who hide behind call-centres in India.

Sorry about that, just had a touch of English - will try very hard not to do it again.

Cheers from beautiful, tranquil France

Dave
 
thebiglad said:
I do understand where you are coming from Dave, but 2 points

1. There is is rarely another vehicle in view where I live, unlike GB;

2. Getting out of bed is a risky business.


No, for me it's the independant life, minimum insurance, fix & service it myself and stop giving money to people who hide behind call-centres in India.

Sorry about that, just had a touch of English - will try very hard not to do it again.

Cheers from beautiful, tranquil France

Dave
Click to expand...
I shall think of you tripping gaily through the peasants and milkmaids on your way to the bar for a long slow conversation with the green fairy. Bet you don't have Sainsbury's and an all-night bus service direct to your door though. Not to mention all those happy little criminals trying your doors 'n windows, or the lonely muggers asking for your charity on street corners with nothing but a pit bull and a kitchen knife to their name. London does have it's plus points, and one day I shall work out what they are.

On a serious note, wot you can get away with over there (and I've seen those English ex-pat builders with their UK registered death trap Sherpas with no tax or insurance, or anything else much) might be taken a bit more seriously over here. That said, there are quite a few people locally sticking Latvian plates on their obviously English cars just to fool the cameras...:D :D :D
 
PASTMASTER said:
On a serious note, wot you can get away with over there (and I've seen those English ex-pat builders with their UK registered death trap Sherpas with no tax or insurance, or anything else much) might be taken a bit more seriously over here. That said, there are quite a few people locally sticking Latvian plates on their obviously English cars just to fool the cameras...:D :D :D
Click to expand...


Eeh by gum, those canny innovative Londoners eh?? Whatever will they think of next?

A tax every time you want to drive into London? It'll never happen !!!

Ooooh it has:eek: - sorry:eek:

Salut mon pote
 
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