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Reifendruck auf Rüttelpisten (Sonstiges)

IVECO Tony @, Wherever., Sonntag, 15. Oktober 2017, 20:19 (vor 37 Tagen) @ Iglmoos

Some tyre manufacturers sensibly recognise that there are different speed - road condition requirements and publish recommendations for the three main types - sealed road, gravel/dirt tracks and deep sand. Michelin is one.

Normal pressure load tables are formulated to protect the tyre from overheating when driving at maximum rated speed - often 120kmph. IF you reduce the speed to half that, then you can reduce pressure to something close to half AND drive for thousands of km without harming the tyre. Yes, uneven tyre wear will result, but in my experience is not a major concern and when driving on corrugated or potholed or rocky roads the reduction in damage to the vehicle is well worth a slight wear penalty. In addition, running the tyres at a lower pressure and reducing the speed accordingly, the chances of a rock or sharp-edged pothole causing major damage to the tyre is greatly reduced.

as an example, there is a file on the internet called The Rick Brake Rim Load Check and Tyre Pressure Calculator and a search should find it and although I don't use it, my figures derived from other sources agree quite well. Bad roads, let the tyres down (even 10psi can make a huge difference) slow down and let the tyres become part of the suspension by flexing over the road imperfections. I follow my advice on all my vehicles, including my 12 metre BigBus with 17 tonnes and three axles which has driven huge distances in Australia over corrugated roads you would not believe.

Of course if you let the pressure down when the road is bad, then either pump them back up again when the road gets better, OR just keep driving at the reduced speed until you can

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Tony Lee
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