/ Tyre load speed ratings
I use 104 R rated tyres which (I think) means there OK to carry a load of 900 kg up to 106 mph.
Does the load rating increase at lower speeds e.g. can the tyre bear a load of 1000 kg at a normal cruising speed of say 70 mph?
Commonsense suggests so but just checking if anyone knows for sure.
What vehicle are they on?
They're on a Toyota Hiace.
However as 4 x 900kg is 3600kg & that is more than the max gross weight of that vehicle you should be ok. The only issue could be the rear axle loading which could be more than 50% of the total.
BUT you should fit the recommended load & speed rating that the maker recommends.
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