QUOTE(steuspeed @ Jun 1 2017, 11:29 PM)
I believe the stock diameter is 25.4" in a 165R15 size. Here is a Porsche approved replacement Pirelli CN36.
http://lucasclassictires.com/165VR15-PIREL...N4-p16515n4.htmDuring a recent German classic car tyre test using a long hood 911 the CN36's were the best performing period tyre especially in the wet. Great-for say an all original -6 or my 911
But the OP has none of neither of those things and has 16" rims to boot, so isn't going to work with his set up
Not sure if you guys can get Falken or Marangoni? (Italian), neither are very expensive here. I've had the latter on the 911 and are way better than the Pirellis that were on it before with the recommendation coming from a race car tyre supplier as the carcass is their race tyre but with a road legal tread / compound. The former I've done 10000's of miles on with the daily driver cars including on my old Audi S6 and happy from a price point / longevity perspective.
OT - The CN36 is kind of spendy, but I am going to purchasing a set for the 911 which is running 7" rears at the moment. Going back to 6" all round in the next month or so when funds allow. This will free up the 7" rims to go with the 8" rims I have stored in the loft and will go on the 914-6 project car