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I have been trying to find out about the meaning of the N ratings on Porsche tyres. There is a reference to it in the usefull links and threads, however when I click on it the page cannot be displayed. Anyone got any information.
 
Production tires that have passed all of the tests and received the engineering department's release can be branded with an N-specification. The N-specification brandings include: N-0 (N-zero), N-1, N-2, N-3 or N-4. These markings on a tire's sidewall clearly identify them as approved by Porsche for their vehicles. The N-0 marking is assigned to the first approved version of a tire design. As that design is refined externally or internally, the later significant evolutions will result in a new generation of the tire to be branded with N-1, N-2, N-3, etc., in succession. When a completely new tire design is approved, it receives the N-0 branding and the succession begins again.
 
I assume that Porsche actually test each evolution of the 'N' tyres on the appropriate vehicle - is this correct ?

I know this has been covered elsewhere, but when did N rated tyres first appear, and was this Porsche or the tyre manufacturer led ?
 
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