[RDM]

While browsing approved Porsche winter and summer tires at Tire and Wheel Approvals - Porsche Service - Service & Accessories - Dr. Ing. h.c. F. Porsche AG, I came across the Porsche tire specification. Evidently there are currently 5 levels (N0 through N4) for summer tires. For '69 to '83 911s with 15 inch wheels, there are tires with N2 spec approved, and for 16s, there are N0, N1, and N3 spec tires approved The pdf doesn't clarify what the differences are between the spec, and why you would choose one spec over the others.

Anybody know what the specifications mean?

And beyond that, is there a reason to prefer an N-spec tire?

Thanks.