Quote:
Originally Posted by lancsdave
Who is making that calculation, the tyre manufacturers or the car manufacturers  |
Both of them.
The car manufacturer desides what tyre type speed and load rating the car needs.
The tyre manufacturer designs the tyres to have a certain load and speed rating.
Quote:
Originally Posted by lancsdave
Well after a slightly heated discussion at the tyre place it seems that the manufacturers handbook is irrelevant. It's whatever the DVLA have on their system that dictates what the insurance companies look at.
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I disagree with that. The car manufacturer says what is safe after all the type approval testing they have to do. If in doubt phone your car manufacturer and ask them what are the correct tyres.
I had a heated discussion when my employer, Michelin Tyre Plc at that time, fitted the wrong speed/load rated tyres to my car. I got a letter from Rover stating what they should be. They replaced them straight away
This is a better explanation of
load/speed rating on tyres. Both are important