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Tyre Pressures for Common Makes

Submitted: Tuesday, Aug 02, 2005 at 15:17

OMN

As a relative newcomer to the joys of 4WDing and reading a few posts on tyres and having recieved conflicting advice from others on the issue of tyres and what pressure could we look at are there some standards that everyone seems to utilise

I'm runnign BFG AT's 285*70*R17, 33" basically
Highway pressure 36
Vic High Coutnry 24 - 26
Sand 20, till i get really stuck in Robe which we did

Most of my driving is unfortunately highway, tyres have done about 20,000 kms and still look in pretty good shape with minimal tread wear, have had tehm rotated and balanced at 10,000 and about to do it again next service in a fortnight or so.

The above are what has been suggested to me by the dealer i bought the tyres from and the peopel i have done some TAG along tours with etc and i have used these settings when out since.

Do the pressures vary between tyre types or vehicles or is it pretty standard.

My vehicle is a 100 Series Petrol 4.7l V8

Thanks for any repsonses.

Mark
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AnswerID: 123361   Submitted: Tuesday, Aug 02, 2005 at 15:30

flappa replied:

It can vary between Vehicles (weight) , and tyres , moreso between something like AT's and Muddies.

Some of it is personal preference.

Those figures are pretty common for AT tyres , and vehicles of that weight.

A lot of people use the 4 psi rule (or Pirelli Rule) , to work out what pressures are best.

I use slightly more in my Patrol (36 and 38) , running BFG AT's , and 34/36 for my Pajero also running BFG AT's.
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AnswerID: 123376   Submitted: Tuesday, Aug 02, 2005 at 16:57

Member - Phil G (SA) replied:

The tyre pressures you quote are pretty common ballpark figures, for the tyres and vehicle you are driving. There are lots of variables and opinions out there, but with time, you'll work out what suits you best.

I lower pressures (to about 23-25psi) whenever I leave the bitumen. Its my opinion that
- you reduce the risk of punctures,
- you reduce damage to springs, shocks, and the vehicle itself,
- and it improves the ride
- you get more grip when 4wding

Naturally I go lower for sand - max 20psi, and maybe as low as 8psi depending on how soft it is. I also go below 20psi on badly corrugated roads.

Its what I've found works best for me.

Cheers
Phil
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AnswerID: 123480   Submitted: Wednesday, Aug 03, 2005 at 00:16

muzzgit (WA) replied:

The only thing I can add to this is that you should possibly look at higher PSI for long highway travel with a load (caravan/camper, plus)

When loaded up with camper and a car full of chit, I run 40 front 42 rear.

Normal highway (unloaded) I run 38 front 36 rear.
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FollowupID: 378616   Submitted: Wednesday, Aug 03, 2005 at 16:59

Member - Jeff M (WA) posted:

Yep, I reckon Muzzgit's spot on.

Also being sandgroppers (in WA) I would also suggest lower than 20psi for sand, personally I go straight to 16psi for sand. It causes less damage to the tracks, you use a heap less fuel, very rarley get bogged and when your doing long beach runs on 40+ degree days it also helps keep your engine temps and EGT's down.

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