sand driving tyre pressures

Submitted: Saturday, Jan 10, 2004 at 09:57
ThreadID: 9635 Views:6271 Replies:4 FollowUps:3
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i went down to my local tyre dealer and he told me to run 32 psi normally front and rear and for on sand no less than 25 psi . i have a troopy with 265/75/r16 . i read on the bridgstone tyre site that contrary to popular belief tyre pressure is not determined by the type of tyre or size but upon your vehicles load and driving application ie speed . on the troopys tyre plate it says front (225 kpa=32psi) and rear a rediculous (390kpa=56psi) .i run my tyres at 32psi all round . so my question is why the rediculous (390kpa=56psi) on the plate .
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Reply By: Eric from Cape York Connections - Saturday, Jan 10, 2004 at 11:02

Saturday, Jan 10, 2004 at 11:02
Glenno are they split rims .
I think you will find the front and rear have a large ply rating and they are truck tyres as standard and not light truck so you can put a lot more load on the tyres.

All the best
Eric York Connections
AnswerID: 42462

Follow Up By: glenno - Saturday, Jan 10, 2004 at 11:50

Saturday, Jan 10, 2004 at 11:50
FollowupID: 304894

Reply By: phil - Saturday, Jan 10, 2004 at 14:39

Saturday, Jan 10, 2004 at 14:39
The 56psi pressure is that required to carry the maximum allowable load. My ute with 205r16 light truck tyres quotes 65psi and this is the maximum allowable pressure listed on the tryes also but this is to carry over 1 tonne extra load. I usually run 35psi rear to allow a reasonable load to be carried without too much tyre flex.

It is also correct that the recommended inflation pressure also takes into consideration heat buildup caused by speed and flexing. You can safely run much lower pressures so long as the tyre does not get hot, ie. sand and low speed.I have heard as low as 12psi advocated. Pressures can, and should, be lowered a bit when travelling on rough roads to allow the tyres to accommodate the surface better and reduce damage risk.The pressure that you normally use should also be chosen to give the most even tread wear from side to side. Comfort also comes into it.

It is all a bit of a compromise, hence the never ending discussion!

AnswerID: 42481

Follow Up By: glenno - Saturday, Jan 10, 2004 at 14:42

Saturday, Jan 10, 2004 at 14:42
thanks for this info phill
FollowupID: 304900

Reply By: Brett - Sunday, Jan 11, 2004 at 01:16

Sunday, Jan 11, 2004 at 01:16
I have TROOPY with Desert Duelers 10 R 15 and have let them down to 15 psi when the need arose. General sand work 20 to 24. Depends on the sand.

As for tyre pressures and load. The Bridgestone technical dept told me years ago thet the tyres should only have a 4 psi differentiaal in pressure between cold( tyre pressure before you set off) and hot( a good high speed run). Apparently this works regardless of load and tyre pressures need to be regularly monitored. Especially if loads have changed.

Does all of that make sense( I have had a few Rums) mmmmm!
AnswerID: 42531

Follow Up By: glenno - Sunday, Jan 11, 2004 at 10:23

Sunday, Jan 11, 2004 at 10:23
yeah____________ ok .
FollowupID: 304961

Reply By: Member - Tim&jan - Sunday, Jan 11, 2004 at 12:49

Sunday, Jan 11, 2004 at 12:49
came back from preston beach last night i always drop to 20psi it makes smooth easy travelling with a bit more to come out if need be you can come down to 12-15psi for the good boggy stuff/gu bush basha
AnswerID: 42575

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