N rated tyres
- Thread starter Nick_USA
- Start date
As Nick says. Don't mix.
But if you speak to Michelin, they say it is perfectly acceptable in this case, as the N1's are no longer available.
Richard, that's the point. N1's are no longer available! My N1 fronts have 4-5mm of tread on them and looks as though I'm going to have to bin them. The OPC agreed that one of the rears needed replacing, I paid for the other but now who pays for the fronts? If I new a month ago what I know now, they should have replaced the one low rear but then should have replaced the other 3 to match them to N2's. Am I right or wrong? Steve
Just phone your OPC and ask them if it voids the warranty. If so, tell them that because they voided it, you want them to reinstate it by fitting new fronts at their expense. A couple of chaps on the 996 forum contacted Michelin about this, and one would hope that the OPC's have taken the same advice.
I have recently bought my car from an OPC. It needed 2 rear tyres which the OPC paid for after delivery. The original tyres were mps n1's. They were replaced with mps n2's. Fronts are the original mps n1's.
Do I have a problem with my 2 year warranty as I don't have the same n rated tyre on each corner? I am getting conflicting views.
Steve
Do I have a problem with my 2 year warranty as I don't have the same n rated tyre on each corner? I am getting conflicting views.
Steve
The Porsche Tech Bulletin does not endorse the action recommended by the tyre manufacturer. As the OPC sold the car them should make good their error. I can also remember when the Conti's went from Contact 2 to Contact 3 there were lots of owners forced to change. Porsche paid for some tyres in some cases. There was no mix and match of ratings then. From the tyre section of the workshop manual (sorry for American Spelling) : Mixing N-Spec Tires Use only tire types tested by Porsche. Only tires with the same manufacturer and with the same specification code (e.g. “N0â€, “N1†…) should be mounted on the vehicle. Tires should be replaced no less than in pairs on one axle at a time. Only tires of the same tire make and type must be used. Since many Porsche vehicles are fitted with different sized tires on their front and rear axles, this requires matching the tire brand, tire name and N-specification front to rear. While the tire manufacturers may also build other tires featuring the same name, size and speed rating as the N-specification tires for non-Porsche applications, these tires may not be branded with the Porsche N-specification because they do not share the same internal construction and/or tread compound ingredients as the N-specification tires. Mixing tires are not permissible and will affect vehicle performance, safety and can affect vehicle warranty. Replacing N-Spec Tires If a vehicle was originally delivered with N-specification tires that have been discontinued and are no longer available, it is recommended to replace all four tires to a higher numeric N-specification design appropriate for that vehicle. In case of tire damage such as cuts, punctures, cracks or sidewall bulges that cause a single tire to be replaced for safety reasons, the remaining matching tire on that axle must not exceed 30 percent wear. If the remaining tire has more than 30 percent wear from new, it should also be replaced. This rule applies to all four tires on all wheel drive vehicles. Handling inconsistencies may result if this is not done.
David B
New member
Steve OPC Reading told me mixing (in my case) N3s on the front and N4s on the back would void the extended warranty. So, a slow puncture in one of the rears cost me £1,000+. In your case the supplying dealer should put it right for you - it would be useful to know when the N1s were last supplied - if the OPC knew it couldnt get them when it sold the car to you, it hasnt got much of a defence. Good luck.
Excellent result! Well done!
That's what the forum is for [
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The question will always arise on N rating about whether it is ok to use different tyres etc and having had cars where the approved tyres were not even superceded any more it was always a concern. Tyre sizes as used on the earlier cars are now commonplace across the tyre market and so early 911's, 924's and the others ( no PSM etc ) are commonly using other brands and tread patterns. In these cases and our cars will one day be in a similar situation some of us may even still have them. My main concern on N ratings is were they tested on the model of car each of us drives? If not, I have doubts until I've tried them or heard from those who have. On the two modern Porsches I've had I have used : Boxster S ( 2000MY ) Pirelli Rosso gret grip upto the point of release which could be sudden Michelin Pilot Sports which gave better wear, good feel and warning well before breaking away which was progressive. Cayman S ( 2006MY ) Continental Contisports had good feel similar to the Michelins but didn't wear so well, Michelin Pilot Sports which gave better wear, good feel and warning well before breaking away which was progressive. Now using Bridgestone Potenzas which I would say again as good as the Michelins but cannot say regarding the wear. It would be interesting to try a test on a circuit such as the Porsche experience centre with mismatched tyres ( just different N ratings or a different approved tyre front to rear ) but I think it doubtful they would go for it unless it proved them right. What are Porsches test methods and proving criteria for tyres? Are they tested on track or on test rigs? Every model and then N rated? Having said all of the above I have driven 944's even turbos on mismatched tyres and found it dangerous but these mismatches were in some cases different brands etc and so were chronically mismatched if they were on a car I'd just bought I would change them ASAP, if it belonged to someone else I'd mention it but the worst I ever drove were Avon Turbospeed's on the rear of a 944 S my son bought, he soon changed those. This is a discussion that will go on as long as Porsche use wheels.
Porsche test extensively and in cooperation with the tyre manufacturers. Every year there is an article in Christophorus magazine detailing some of the test process.
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