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Hello, I just returned to State side after ten years of living overseas. To jump into the winter here is Colorado, I need to get winter tires on my 1999 996 C4. Service manual shows the following as a starting point.

1999 996 C4 tire spec.jpg

My C4 has 225/40 R 18 for fronts and possibly 7.5J x 18 - 50 for wheel. Similarly 265/35 R 18 for rear and possibly 10 J x18  65 wheel. However, winter tire conversion may not be so easy. It seems to require 17 inch wheels: 205/50 R 17 89T M+S - 7Jxł7 - 55 for front. 225/45 R 17 90T M + S - 8.5J x 17 - 50. I haven't done anythig to brake caliper hoping that there wont be intrference with smaller radius. Any input or even insight into this is appreciated.

 

 

Edited by Speedobird
typo

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