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Ho ho ho ...
For Porsches, it's easy ... it's whatever tire Walter Rohrl tests and approves ... which rates an "N" molded into the sidewall.
Perhaps the greatest rally car driver ever, now a Porsche consultant.
As I write, currently running the Millie Miglia in an old 356.
You can find the list at Porsche's website.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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