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It's on the sidewall of the tyre....Quote:
Originally Posted by Gromit3528
BFG's are anywhere from 44-50 psi depending on whether they are LT rated or not with the LT's being 50psi.
Using Capitals, the difference between helping your Uncle Jack off a horse or helping your uncle jack off a horse...
Anything higher than 40psi is as rough as guts.
Thanks for the responses.
Well the BFG Goodrich tyres are indeed prefixed LT before the size 245/75/16 (whatever the LT means) but the only reference to pressures on the sidewall is for the max load which is 1380 Kgs at 80 PSI cold!!
There is no way I'm pumping these up to 80PSI :eek::eek::eek::o
but then I'm sure each wheel is not carrying 1380Kgs each
Without a weighbridge I can't tell what weight I have on the front or rear tyres and BF Goodrich wouldn't have known what load these tyres would carry when they moulded the tyres. The correct pressure must surely be related to the weight they are carrying?
The handbook has significantly different pressures for the front and rear tyres in both the 205 and 235 sizes specified, so presumably this would also be true for using the 245 section.
Has any body actually got a recommended pressure for this size?
Cheers
Gromit
"You've just gotta be lucky sometimes!"
LT is Light Truck.
You sure it says 80????
Using Capitals, the difference between helping your Uncle Jack off a horse or helping your uncle jack off a horse...
I had previously been running my bfg's at 36 but now run 40psi which is better for my daily highway run to work of 56k's return, its slightly harsher at 40 but i can feel the rolling resistance is less and response is better.
Well thanks again guys.
Yes it definitely says 80 PSI on the sidewall. I think between 30 and 40PSI has got to be somewhere about right and if LoanRangie can feel the difference between those pressures I think I have just got to experiment. I just don't want all the fannying about to cost me a set of tyres:o
Cheers
Gromit
"You've just gotta be lucky sometimes!"
The relevance of the 80PSI is that the construction of the tyre allows a MAXIMUM pressure of 80PSI and the load rating is calculated at 80PSI.Quote:
Yes it definitely says 80 PSI on the sidewall.
I doesn't mean you have to run it at 80PSI . As long as you do not run a higher load than its rating at any PSI, you can run it where you like. There are charts available of load rating % s at various pressures , but you can be sure that on a Disco 1 there is PLENTY of load rating left at "normal " pressures.
I find over say 32PSI in the front gives nibbly and rattly steering, as the D1/RRC is not designed for tyres wider than 205 really, and the distance from bearing centre to edge of tread on a 245 is 20MM more each way. The lower pressure gives more damping to the tyre.
You have to be more concious of load rating at the back so 40PSI is a good compromise but maybe 36 gives a better ride i f you know you are going to be empty.
Regards Philip A
If you look at this chart you will see the load rating reduction for Goodyear LT tyres from 80PSI down to 35PSI.
And you should see that at 35PSI there is lots of load rating left at the front of a Disco .
http://hmcclub.homestead.com/Goodyea...oad_Charts.pdf
Rating at 35PSI is 1545Lbs per tyre or 3090Lbs for the front axle
At 40PSI it is 1695 Lbs per tyre or 3390Lbs for the rear axle
Regards Philip A
If you put 80PSI in a trye it should be done in a saftey frame no more than 40psi should be put in a tyre car or 4x4
Where on earth do you find this info.?:D The chart is very useful and shows that pressures for passenger tyres and Light Truck tyres should be considered very diffferently. I now won't be dropping mine below 35PSI but I will have an experiment. You'll see from the chart that truck tyres may well be inflated up to 80 PSI if conditions demand and I know big trucks have pressures over 100PSI which is why I will exceed the speed limit to pass them especially on my motorbike. I had one explode right beside me a few years ago and it was like a bomb exploding, I was very lucky only to be hit by the blast and not great lumps of rubber
Cheers
Gromit
"You've just gotta be lucky sometimes!"