Gnil:
Grant:

Yeah, the size of the rear N-rated Cup2 and Race Maxx is a strange size (getting another 305/30/20 rear tire although marked the same size will not fit properly on the 12" rear wheels).  The OEM 305mm tire is built like a 325mm wide tire, but with 305/30 sidewall size - they do this to make the OEM Michelin and Dunlop tires exclusive for the GT3.  Winter tires require their own (narrower) wheel to work perfectly as intended, afaik.


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18 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi

 

So what  about this ? Approved from Porsche  with N rating 

 

PNEU MICHELIN PILOT SPORT 4S 305/30R20 103 Y

Logo Michelin

MICHELIN PILOT SPORT 4S

305/30R20  103 Y 

XL, N0 (PORSCHE)


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 964 Carrera 4 --  997.2 C2S , -20mm -- 991.2 GT3 RS 

 

It may be approved for "some" Porsche model, but you need to confirm it works with large GT3 12" wheel, not just 11" wheel from Carrera...

It's possible there is a 4S tire for GT3 now, but there was not last time I looked...


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18 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi