Tyre pressure ?

[buster uk]

hi guys,wonder if you can help me.I have BFG mud terrains on my standard 3 spoke rangie alloys they are 235.85.16.What PSI should they be at please ?

The tyre place put them at 30 psi but they look podgy and a friend said that maybe they should be 50 psi so im unsure.

cheers
andy

[v8kenny]

Run mine at 30 front and 35 rear - I would think 50 is waaay too high

[pedro]

it depends wot your using them for.
Off raoding it want to be as low as possible before spinning on the rim
On road they want to be quite high.
i have an air comp on board so i can change them to anything.
but i guess 30psi is about right for general off and on road use.

Pedro.

90 90 200tdi
Baby Rangie 3.5v8  (bobtailed, snub nosed, chasis to 87")

[buster uk]

i also have an on board compressor,its the air suspension one.i think 30 looks too low,got them all at 40 now and drives better on road,30 was good offroad,but id like to know the correct on road pressure please

[v8kenny]

According to my original owners handbook for a 1990 3.9 V8
the tyre pressures for normal road use should be 28 front and 35 rear -
off road use 17 front 25 rear and for sustained driving speeds above 100 mph  :shock: and heavy rear loads the rears should be increased to 41
all pressures checked from cold tyres

[buster uk]

i have the original owners manual but my tyres arent the original 205's, they are 235 85 ,so i assume they are different pressure or not ?

[v8kenny]

My last motor 110 V8 CSW - I ran at 35 front and 40 rear on 235/85's with no abnormal tyre wear and good handling
Current 200 tdi 90 0n 255/85's runs at 30 front and 35 rear as does my V8 range rover on 235/70's and don't have any problems with either
I would think these pressures would be fine unless anyone tells you any different    
Of course the air is better up here in Scotland ! :D

[Grunter]

I run 265 75's at 40 psi on my range rover, helps the road manners and while i realise they should be dropped for off road use have rarely had to.  They have covered 14000 miles now and they have worn evenly.

Hope this helps.

[FITZ4X4]

I run 235/85 16s on my Rangie. I use to run 30 psi on road dropping to 22 psi off road but I found I was geeting a lot of tyre wall damage at the lower pressure. My mate ran his at 35 psi both on road and off without problems. I now run mine at about 32psi for the past year. The higher pressure seems to help the traction in most conditions and clears the tread better in mud. It also improves the turning circle and gives sighty higher diff clearance. 90% of the time it's an advantage. The only time it's a dissadvange is over smoth stone and rock but I very rarly encounter that terrian.

[muddysteve]

when i had my new ones fitted the tyre place told me bfg recomends standard manufacturers pressure + 7 psi for the muds. for road use that is, off road its as low as you dare to go


Steve

[Range Rover Blues]

Run them at the standard pressure.  They look podgy because they are very wide on the rims, the wider they go the less tolerant of over-pressure they will be.  It's going to handle like a cow simply because of how big they are.

The owners handbook also says you can reduce the rear to 32 if the car is empty, so it's 28 front and 32-35 rears.  If I run mine any higher it slides about too much so I know it's about right and I have the exact same tyres you do.

Did you know you can damage a tyre by running it too hard? and I don't just mean the tread wear.  It causes something called a concussion punture, more like a blowout in practice.

[buster uk]

thanks for the help guys,been running around this week with them all at 40 psi.I must admit it does drive better than it did when they were all at 30 psi.

So if i apply the +7 psi for mud terrains to standard pressures then i should be running : 35 psi front and 42 psi rear.

Do you guys think i should try that ?? actually why are the pressures higher for the back ? also i noticed that it was the back that looked more podgy than the fronts at 30 psi.

[Jonny Boaterboy]

Dont know if this will help but I have 245/70/16 BFG alltarains on my Range Rover (same year as yours) I rang the tec line that is advertised in the magazines, (cart find there no. at the moment!) and they told me that 6psi above standard is about right. So if I were you I would go with the 7psi above standard which would give you 35psi front 42psi on the rear's. and then drop them to when off road-en. I would'nt run them the same all round. will post the no. for you if I find it.

Merry Christmas

[Range Rover Blues]

They are higher at the back because the back of the car is heavier, is that not obvious?

If you want to run the tyres at higher pressure than recomended by the vehicle manufacturer then it's your funeral.  I would suggest you try starting at the recommended pressure and try increasing them steadily so that you can observe the effect is has on handling.  I run mine at 28/29 front and 35 rear, my car weighs 2,360kg empty!

[datalas]

They are higher at the back because the back of the car is heavier, is that not obvious?

Not strictly true... it's usually lighter unless you have something in it :)  (which, for the likes of me includes a ton of junk at the best of times)

[buster uk]

They are higher at the back because the back of the car is heavier, is that not obvious?

Well no actually i dont think it is obvious ! i thought the front would be heavier due to the fact it has a big chunk of aluminium between the front wings and all the other crap thats bolted to it, and the back has an empty sheet box over it IE the roof.

[PoPrivit]

Hi guys sorry to change tack here but i am just about to put some new tyres on my rangie and i noticed that a couple of you are running 235/85/16's MT did you have to make any arch mods for these to fit please? I am thinking of a 1" lift but not till after the new boots are on.

Many thanks rich

[Range Rover Blues]

They are higher at the back because the back of the car is heavier, is that not obvious?

Well no actually i dont think it is obvious ! i thought the front would be heavier due to the fact it has a big chunk of aluminium between the front wings and all the other crap thats bolted to it, and the back has an empty sheet box over it IE the roof.

Then you need to read your handbook!  The front axle MAX WEIGHT is about 1100kg on a car that weighs 2010 kg empty, 2510kg full.