Tyres again

Submitted: Tuesday, Apr 27, 2004 at 14:39
ThreadID: 12417 Views:1569 Replies:4 FollowUps:3
This Thread has been Archived
I have looked at all the threads in the archives about this and my low IQ is very mixed up. Have just changed over my tires to 235 75 15 BFG AT?s.
The question is, what pressure should I be running. The placard in the car states 200 Kpa, but all the threads seem to be much higher.
When the truck came back from the tyre dealer it had about 260 Kpa in them all.

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Reply By: duncs - Tuesday, Apr 27, 2004 at 15:03

Tuesday, Apr 27, 2004 at 15:03

The plackard on the vehicle should give a range of pressures for the tyres depending on load and what work you are doping. Also on the side wall of the tyre usually in small print that is very hard to read it will give a max pressure and load.

I find the max pressure off the plackard is a good starting point for highway use. Pressures need to be adjusted depending on the road/track surface. That argument could go on for ever.

AnswerID: 56208

Follow Up By: Vince NSW - Tuesday, Apr 27, 2004 at 15:10

Tuesday, Apr 27, 2004 at 15:10
Thanks Duncs
My work car has a rangeon the placard but the 4by just has 200 Kpa for all weights and speeds. I will try the tyre wall with large magnifyer, as my eyes are as bad as my spelling.
Thanks again
FollowupID: 317990

Reply By: Baz (NSW) - Tuesday, Apr 27, 2004 at 15:07

Tuesday, Apr 27, 2004 at 15:07
Vince, i have 255/70/16 BFG AT's and was recomended 40 psi, my Explorer is 2 tonne, i've heard you have to adjust pressure for tar and dirt but have never done this as people have told me that it has know affect on handling that they have noticed, i will try it one day to see for myself though, only time i deflate is in soft sand. oh the placard pressure's are for comfort not handling.
AnswerID: 56210

Reply By: ianmc - Tuesday, Apr 27, 2004 at 17:01

Tuesday, Apr 27, 2004 at 17:01
About 30 psi all round for a medium weight 4wd unladen, more in the rear according to load. Done many kms in a Triton with these pressures and got good kms & even wear. Usually use 40psi upwards when heavily laden over rear axle with manufacturer quoting up to 55.
AnswerID: 56231

Follow Up By: Member - Nick (TAS) - Tuesday, Apr 27, 2004 at 18:24

Tuesday, Apr 27, 2004 at 18:24
I agree,we run 30psi all round in our 4 Runner upping to 40psi loaded.Any more than 30psi unloaded we get to harsher ride and so far getting perfect wear.
FollowupID: 318021

Reply By: The Banjo - Tuesday, Apr 27, 2004 at 18:32

Tuesday, Apr 27, 2004 at 18:32
Just fitted my second set of BFG 245/70-16 on the Jack. I have confirmed the following figures as best for me, after looking at the wear as they came off.
Blacktop....36 front.....40 rear
Gravel ......28 front......32 rear (max speed of 75/80 - and pick a track through those stones !)
Soft sand - 18 front.....24 rear
Most of my travel is blacktop, and if you go lower than 36/40, you'll wear the shoulders earlier than the faces. Hate to be rude to tyre dealers, butsome of themmay know little about outback tyre success.....ask one in the bush I say.
AnswerID: 56251

Follow Up By: Member - Jiarna (SA) - Tuesday, Apr 27, 2004 at 22:05

Tuesday, Apr 27, 2004 at 22:05
Banjo's on the money. Drop about 8-10 psi from blacktop pressure when you hit the gravel, and remember that these are cold tyre pressures.

Those who say something cannot be done should not interrupt the person doing it.

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