"N" rating , quick question

[anonymous-user]

I have done a bit of research on the N rating saga.

Basically after having my major service , porsche have tried to take my eyes out further with more bits and pieces that need sorting.

Mainly the front tyres are not N rated , im running pirelli corsas all round but the front are not N rated , question is , bottom line , do i need to worry / change the tyres!?

Im sure my old cups were not "N" rated so i cant really see an issue other than im kind of Mixing tyres in a way.

Thanks

Paul

[grumbledoak]

Eh?

The letter rating on a tyre is a speed rating. "N" is rather low: 87mph according to these guys:
http://www.blackcircles.com/general/speedrating

[The Griffalo]

"N" is Porsches designation when a tyre has been tested. I think N4 is the latest. IIRC "N" goes through additional testing compared to a standard tyre due to the higher loading a Porsche places on the tyres.

[grumbledoak]

Thanks muchly: 87mph max in a 996RS didn't make much sense even to me (and admittedly, I'm odd).

Note to self: must get around to trying the 'pork' thing

[computamedic]

As stated above, the N-rating relates to Porsche's own evaluation and approval of a particular tyre tyre. As each tyre is evaluated and, indeed, often modified to suit Porsche's requirements it is given an "N" number. The first tyre of a particular make and model will be assigned N0, the next N1 etc. Relatively few manufacturers submit tyres to Porsche for approval and those which ARE approved are approved for fitment to a specific vehicle. For example a Bridgestone S-02 FZ is approved for the Boxster whereas an S-02 JZ is approved for a 911.

The "N" numbers range from 0 to whatever for each manufacturer.

Some - repeat SOME - insurance companies will deny a claim if your Porsche is NOT fitted with N rated tyres. You should ask the insurance company if you are not sure if you are determined to fit non N-rated tyres.

Porsche often specify changes to a tyre in order to award an N rating. Sometimes the rubber compound is changed, sometimes the sidewall specifications, sometimes the tread pattern. For this reason you should never mix N-rated and non N-rated on the same car since their qualities will differ.

Hope this helps.

Dave

Edited by computamedic on Thursday 20th September 10:38

Edited by computamedic on Thursday 20th September 10:39

[sleep envy]

computamedic said:

The first tyre of a particular make and model will be assigned N0

are you sure about that? My Conti SC's were simply N

[911-32]

Insurance companies refusing claims for non-N rated tyres? Where is the evidence?

So long as you have MOT-able tyres what are the grounds for refusing a claim? Smells of urban legend to me.

To clarify, N ratings are totally different to the tyres speed rating. As explained they indicate a tyre with the Porsche seal of approval. Personally, I think the N rating is just one of the many factors I would consider when picking a tyre for my 911, it would certainly not be the decisive factor though.

[speedyellowrs]

Recently renewed my insurance and raised this issue with them, as I was looking to put a set of trackday tyres (ie not N rated) onto my RS. Insurer (A Manning through Allianz) said that as long as tyres were of appropriate size etc and road legal it wouldn't be a problem in the event of a claim. Hope this helps.

[pete.g]

You may also find, as is the case here in Northern Ireland, that 'N' rated tyres are supposedly only available at an OPC . . .

You can guess the rest.

[Sundeep]

Paul_D_996RS said:

I have done a bit of research on the N rating saga.

Basically after having my major service , porsche have tried to take my eyes out further with more bits and pieces that need sorting.

Mainly the front tyres are not N rated , im running pirelli corsas all round but the front are not N rated , question is , bottom line , do i need to worry / change the tyres!?

Im sure my old cups were not "N" rated so i cant really see an issue other than im kind of Mixing tyres in a way.

Thanks

Paul

All you need to know about N Rated tyres, with a N rated Tyre Guide at
http://911uk.com/template.php?page=4

regards

[anonymous-user]

Thanks Chaps!

Paul