Letting tyres pressures down

What a load of crock, your insurance still pays if you had a slow leak that was the cause of an accident, that would be "driving on underinflated tyres"

Anyway The only time tire pressures are taken is after a fatality as part of an accident investigation, vic alpine police do indeed drive on low pressures,

The placard on my truck says 300 to 700 kpa depending on load, the tyre sidewall says 450 kpa MAX, I never run higher than 260 kpa, its the correct pressure determined by the "chalk line across the tyre" method.

If this information was true, then inflating your tyres above the 'recommended' pressure would also be illegal.

Most tyre dealerships will not fit tyres to vehicles that they know will be illegal; however, when you buy LT tyres they pump them up to 38/40psi and advise that you can go higher if needed.

Keep in your mind, trainers teaching many big mining and government organisations also do not allow kinetic rope recovery using the 'accepted' technique.

Its all about keeping their staff and workers in the cleanest OH&S scenarios and preventing the 'UN-common sense' scenario from taking place.

Personally, I will continue to air down, its better on you, the vehicle and the environment.

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Originally Posted by loanrangie

Common sense would dictate that if you had to travel more than a couple of hundred meters on bitumen @15 psi then maybe you should take the time to air up.

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I've driven hundreds of kilometres at those pressures, gazillions of times, its not that large of an issue, turning may suffer a smidge, but braking is vastly improved;)

Anyway, just cause it comes from a copper does not mean its gospel

Attachment 75499 says a lot about Police off road training

cheers
Chookie
'98 300Tdi Disco

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Originally Posted by Chookie

Attachment 75499 says a lot about Police off road training



cheers

Chookie

'98 300Tdi Disco

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This isn't a bash the police exercise. It's about incorrect information.

There are errors in all professions, nobody can know everything, or they may misinterpret what they think.

In this case the trainer (who happens to be a former police officer) is incorrect.

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Originally Posted by rovercare

I've driven hundreds of kilometres at those pressures, gazillions of times, its not that large of an issue, turning may suffer a smidge, but braking is vastly improved;)

Anyway, just cause it comes from a copper does not mean its gospel

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I'm not saying that I agree or disagree with the trainers comments. But the point was that they teach air down only when necessary and air up once though the obstacle. As the beach is a gazetted road.
However to say that you think it's "not a large issue" to travel at 15psi for hundreds of kilometres gazillions of times is possibly the most irresponsible thing I have heard in a long time.

Nino.

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Originally Posted by landy

I'm not saying that I agree or disagree with the trainers comments. But the point was that they teach air down only when necessary and air up once though the obstacle. As the beach is a gazetted road.
However to say that you think it's "not a large issue" to travel at 15psi for hundreds of kilometres gazillions of times is possibly the most irresponsible thing I have heard in a long time.

Nino.

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Exaggerated, perhaps.

But, ".... possibly the most irresponsible thing I have heard in a long time."!

You don't get out much, do you?

Quote:

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Originally Posted by landy

I'm not saying that I agree or disagree with the trainers comments. But the point was that they teach air down only when necessary and air up once though the obstacle. As the beach is a gazetted road.
However to say that you think it's "not a large issue" to travel at 15psi for hundreds of kilometres gazillions of times is possibly the most irresponsible thing I have heard in a long time.

Nino.

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Yep, irresponsible is me, death on wheels I tell ya:D

Possibly driving a 4wd on the road as opposed to a vehicle that has a low centre of gravity, well equipped with electronic stability control, anti lock brakes, airbags, low profile tyres could be deemed "irresponsible" but I'd hazard a guess and say those that do, drive appropriately, considering the vehicle/conditions/terrain/visability etc at the time of driving, but hey, lets not use pragmatic thoughts:)

quote, page 14 of the WA Police survival guide

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• It is a good idea to lower your tyre pressure to around 80% of your highway running pressure. This will give the tyres a little more flex and grip to mould over rocks and loose gravel rather than causing the wheels to spin and lose traction, which would occur if the tyres were left at the hard highway running pressure.

• When driving in soft or sandy conditions the lowering of tyre pressures can prevent bogging. Tyres can be lowered to a minimum pressure of 16psi in both split and safety rims. Tyres must be re-inflated immediately after traversing the obstacle, failure to do so will lead to tyre damage.

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