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BFG KO2 PSI
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crooks_uk
 


Member Since: 04 Jul 2017
Location: Newcastle-upon-Tyne
Posts: 39

BFG KO2 PSI

Currently running BFG KO2 all terrains tyres in 265/65R18 load rating D. I believe that the standard pressures given by Land Rover are for a XL P rated tyre and that a D rated tyre needs to be inflated at higher pressures than stated on the door card.

Has anybody got any experience of running these tyres and recommendations on the correct psi?
  
Post #229945410th Jul 2022 11:07 pm
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crooks_uk
 


Member Since: 04 Jul 2017
Location: Newcastle-upon-Tyne
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Is anybody running these tyres and if so, what pressures are you running?
  
Post #230017515th Jul 2022 8:16 pm
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LT
 


Member Since: 31 Dec 2005
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United Kingdom 2016 Discovery 4 3.0 TDV6 Landmark LE Auto Santorini BlackDiscovery 4

You need to experiment.

I ran the standard size 255-60-18 ATR’s and preferred 35-36psi on the front and 38-40psi rear.

I’d start with those and see how it feels. Thumbs Up
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Post #230017715th Jul 2022 8:27 pm
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riverblanche
 


Member Since: 31 Aug 2010
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Hi,

there is a calculation that uses the data on the tyres sidewall (istr max pressure) and the Actual weight of your car to give the "best" pressure, can not remember the calculation but we used to use it work out pressures on previous cars, had a D2 much modded, winch ect and running 235/85/16 it worked out very well for that, worth trying a search Question

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Did a search as knew I had posted it in the past ....... 2010 Shocked calculation is on and explained on page 2 of this thread

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https://www.disco3.co.uk/forum/255-55-19-g...hlight=psi
.
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Post #230027116th Jul 2022 9:17 pm
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crooks_uk
 


Member Since: 04 Jul 2017
Location: Newcastle-upon-Tyne
Posts: 39


thanks for the replies guys. Was happy running them at 33 psi front and 36 psi rear (as light load on the door sticker) but noticed that lots of Americans are running them at higher pressures because they are loaded rated D so upped the pressures a little. Will running them at light load pressures cause problems or do I need to up the pressure due to the load rating?
  
Post #230028216th Jul 2022 10:49 pm
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scraig
 


Member Since: 06 Feb 2011
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Canada 2008 LR3 4.4 V8 SE Auto Stornoway GreyLR3

I'm running the 265/65/18 KO2s at 40 psi in the fronts and 42 psi in the rears - one of my buddies got those pressures from BFG..........
 Stewart  
Post #230098921st Jul 2022 10:31 pm
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crooks_uk
 


Member Since: 04 Jul 2017
Location: Newcastle-upon-Tyne
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Thanks Stewart. Are you running light or heavy at those pressures?
  
Post #230099021st Jul 2022 10:33 pm
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scraig
 


Member Since: 06 Feb 2011
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Canada 2008 LR3 4.4 V8 SE Auto Stornoway GreyLR3

I'd say light load if you are referring to additional weight added for items such as roof racks, etc. When I do load up for an adventure I don't change for the few hundred kms on pavement as I tend to be airing down for off road purposes anyways. I think LT's suggestion of experimenting a bit is a good one Thumbs Up
 Stewart  
Post #230107522nd Jul 2022 9:10 pm
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crooks_uk
 


Member Since: 04 Jul 2017
Location: Newcastle-upon-Tyne
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thanks for the reply. Have checked with BF Goodrich and they have advised to go with Land Rover's recommended pressures.
  
Post #230108022nd Jul 2022 9:47 pm
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scraig
 


Member Since: 06 Feb 2011
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Canada 2008 LR3 4.4 V8 SE Auto Stornoway GreyLR3

That's good to know! Thanks
 Stewart  
Post #230108422nd Jul 2022 10:33 pm
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riverblanche
 


Member Since: 31 Aug 2010
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Hi,

you can work it out if you want to know Question

you only have to get the Actual weight of Your car to do it Whistle

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Post #230108522nd Jul 2022 10:34 pm
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Moleshome
 


Member Since: 15 Oct 2020
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United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Yulong WhiteDiscovery 4

So I've just bought some Cooper Discoverer AT3 4S in 265/65R18

Kerb weight of the disco 4 is roughly 2,500Kg
Max load 1180Kg
Max pressure 44PSI

So:
4,720 / 2,500 = 1.888
44 / 1.888 = 23.3PSI

I'm not convinced.

The process that Cooper recommend is to inflate the tyres to the manufacturer's recommended pressure with the tyre cold, drive for 25-30 minutes to get the tyre up to temperature and check the tyre pressure.

For a 4x4 you should see a 6PSI increase over the initial pressure, if you see more than that you need to add more air, if you see less then you need to let some out.
  
Post #23137505th Nov 2022 8:04 pm
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riverblanche
 


Member Since: 31 Aug 2010
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England 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Hi,

The calculation was 12 years old when I first posted it,
so thought tyre technology may have moved on a bit Question
as the BFGs I was running had a max weight of 1000kg not 1180kg also the max pressure was higher 50 not 44

But

you may be surprised of the D4s weight if you get it weighed, our D2 came in at 2600kg Shocked
so D4 more like 2700kg ?

1180x4=4720/2700=1.748 44/1.748=25.17psi

Give it a try you may be convinced (or not)
but it does give an accurate start point,
had a quick search for tyre pressure calculations and found this so it may not be as far off as you think Exclamation
.
OEM Tire Size 255/55R19 (XL 111) with load capacity of 2027 lbs. @ 34 psi.
New Tire Size 265/65R18 (SL 114) with load capacity of 2054 lbs. @ 27 psi.

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gone D2 Td5 1999

I plan on living forever and so far so good !

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Post #23140707th Nov 2022 7:53 pm
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RRSTDV8
 


Member Since: 07 Apr 2014
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United Kingdom 

Moleshome wrote:


The process that Cooper recommend is to inflate the tyres to the manufacturer's recommended pressure with the tyre cold, drive for 25-30 minutes to get the tyre up to temperature and check the tyre pressure.

For a 4x4 you should see a 6PSI increase over the initial pressure, if you see more than that you need to add more air, if you see less then you need to let some out.


c.2psi per 10 deg C temperature change, so they're saying the tyres will warm up by 30 deg C over whatever they were when inflated. I guess as a measure of sidewall flexing, and thus correct pressure, that's a reasonable approach.
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Post #23140857th Nov 2022 8:54 pm
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Moleshome
 


Member Since: 15 Oct 2020
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United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Yulong WhiteDiscovery 4

https://www.coopertires.com.au/media/1400/...ssures.pdf
  
Post #23141007th Nov 2022 10:36 pm
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