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Tyre loads when 4wding

Submitted: Wednesday, Nov 04, 2009 at 19:57

nickb

I was just thinking about load ratings on tyres.

As an example, if a tyre has a load rating of 1100kg and your 4WD weighs 3000kg, that means when you are 4wding and the 2 opposite wheels lift off the ground, the 2 tyres still touching the ground are taking a load of 1500kg.

Also, load ratings are at a certain PSI. When offroading, most people let their tyres down, would that the de-rate the load which the tyre can handle?

Would it cause some sort of damage which wouldn't be immediately apparent?
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AnswerID: 390018   Submitted: Wednesday, Nov 04, 2009 at 20:29

Robin Miller replied:

Not so much damage Nick , the load raings are really for speed under load.

So when pressures are down for off roading its ok so long as speed is dropped accordingly
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Robin Miller
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AnswerID: 390048   Submitted: Thursday, Nov 05, 2009 at 07:55

Snowy 3.0iTD replied:

As stated the load ratings apply for the maximum speed rating. As each section of the tyre deforms and then returns to normal as the tyre rotate, a tiny amount of heat is generated. The more it deforms the more heat is generated, and obviously the faster it is rotating the quicker the heat is generated. You reach a point where the heat is generated by the tyres deforming, faster than it is dissipated, the heat builds up to the point where the tyre delaminates and you have a blowout.

Cheers

Snowy
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