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Today’s question has to do with finding the right tires for your Porsche. More specifically:
“What does it mean for a tire to have a Porsche N spec approval?”
A Porsche N spec approved tire is one that has passed a series of difficult and diverse tests designed by Porsche engineers to ensure maximum performance and safety under a wide range of driving conditions. To qualify for this approval and “to be an Original Equipment tire provider on a Porsche vehicle or be approved by Porsche for the replacement market requires the joint product development efforts of the tire engineers working alongside the Porsche vehicle engineers.” In some instances specific tires will only be approved for specific Porsche applications or models.
Tires may be specified for a particular vehicle or range of vehicles and must successfully pass the tire company's laboratory tests to assure that they would be capable of adequately supporting the Porsche vehicle while allowing it to reach its top speed on the German Autobahn. Additional laboratory, test track and race track tests are conducted to confirm that the prototype tires meet Porsche's noise, hydroplaning and handling requirements. Prototype tires will also be evaluated to assess their high-speed durability, uniformity and serviceability. Upon test completion, the tires will be released for production.
Let’s look at some of the tests required by Porsche for N spec approval:
- SPEED: The tire must be capable of safely handling the Porsche vehicle at any speed while allowing it to reach its top speed on a track or the German Autobahn.
- NOISE: As tires continue to grow in size and width, noise suppression becomes more and more important. Generally speaking, Porsche performance tires are low profile and very soft. This makes it even more difficult to manage road noise. You can rest assured that those tires with a Porsche N spec approval will be as quiet as possible.
- HYDROPLANING: The focus in recent radial tire development for Porsche vehicles has primarily included optimum handling on dry surfaces and the safest possible behavior on wet surfaces, even at high speeds. Tires developed by various manufacturers, in concert with Porsche, offer a specific set of wet grip properties which few, if any, other autbile manufacturers demand in equal measure from the tires they use on their vehicles.
- HANDLING: I’m not sure this particular heading requires any additional explanation. Your tires provide the grip that keeps your Porsche “stuck” to the road. Poor tire construction, soft sidewall, tires that are too firm, etc. all these things will lead to reduced handling and possible safety concerns that can be avoided by choosing a Porsche N spec tire.
Once a tire has been approved by Porsche it is branded with the N spec approval. 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.
It is important to note that certain tire manufacturers may produce the exact same tire in name, size and speed rating as those that have the N spec approval. However, if they are not branded with the N spec approval than there is no way to guarantee that they will perform to Porsche requirements.
Replacing Porsche Approved N Spec Tires
According to a recent Porsche owner’s manuals, if you do run Porsche N spec approved tires on your car, it is always recommend that your tires be replaced in pairs (one axle at a time.) In the event 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. Handling inconsistencies may result if this is not done.
Here’s a list of some of the more popular Porsche N spec approved tires:
There are many, many more tires, than those listed above, that are Porsche N spec approved. If you are researching tires, one of your best bets is to check out
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Updated: August 12, 2016