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For some time I have heard that Kumho was coming out with an 18" competition tire (the V700 series I think). At first it was April 2001, but so far no sign of the tires. Does anyone have any insight here?
Unfortunately the new tire from Kumho is not going to be enough for the Z-06 cars. It would compliment a LS1 Car very nicely, due to LS1 models, having taller gears, and 9.5" rears.
The tire from Kumho is a 285/30/18 and will match well with a 255/40/17 Front.
However... On a Z-06... the 285/30/18 has a lower overall diameter than the 275/40/17 Fronts.
For Z-06 Owners that want to run Kumho's I would recommend the new 335/35/17 which fits a 17X12" wheel Nicely.
I was able to do some testing with the new Kumho, and they are much better, and Lighter ,however... the 18" is 'loose' on the 10.5" rear wheel of a Z-06.