Tyre loads when 4wding
Submitted: Wednesday, Nov 04, 2009 at 20:57
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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?
Reply By: Robin Miller - Wednesday, Nov 04, 2009 at 21:29
Wednesday, Nov 04, 2009 at 21:29
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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Reply By: Snowy 3.0iTD - Thursday, Nov 05, 2009 at 08:55
Thursday, Nov 05, 2009 at 08:55
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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