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I've been using this calc. found in the stickies here. http://www.1010tires.com/TireSizeCal...?action=submit . When i plus in the 245/35/19, and 275/35/19, it gives the error message saying they are out of the 3% range. That's why i'm trying to plug in other sizes, not b/c i can't comprehend.
The tire calculator you are using, doesn't take the stagger built into the "Z" or the "G" into account. So, basically it's worthless for what you are trying to do. It is giving you staggered width sizes and trying to keep the ODs the same front and rear, this is helpful if your trying to retire a car that has the same OD front and rear, like a BMW, not like the Vette, "G" or "Z" that staggers the diameters front to rear. The rears are about 1" larger in diameter in back than in front. BTW, it looks like this wont be a problem in the next generation "Z". The 2008 "G", already announced, has staggered tire sizes front to rear in the sport model, but maintains the diameter front to rear, I'd expect the "Z" to follow suit.
