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FYI, Hoosiertire.com has the 285/645R18 GT-O Continental Extreme Contact Racing Slicks on sale for $110 each. I just picked up three sets for next year. This is a great price for new tires if your running a square setup with 10" width wheel.
645s are fine, I ran that height all last year and will run it for the forseeable future. Depending on what tracks you run, you could run out of gear in 5th with the shorter tire, however (assuming you're on the factory tune and rev limit).
FWIW the first year we ran Indy they developed a SOFTER tire than the one they currently used. This tire then became the standard Continental tire, to my knowledge the compound has not changed. The original tire was used at Indy only the first year, then became the norm the following year. This applies to the CTSCC only, I'm not sure about the other series, they may use a different compound.
This is what I found: "The Continentals come in four compounds, GT, GTO, GTR and GTI. The GT's are old. The GTO compound is from 2012 at Daytona. The GTI is from Daytona, Indy and the Glen in 2013. The GTR compound is for all remaining road courses. The GTR being the fastest of them all"
So to my understanding the GT-R is a soft one...
The GT-O is harder. I actually liked them better (even though the GT-R was faster). The GTO would stay consistent the entire weekend whereas the GT-R fell off (significantly) after the first day and then again each session thereafter. Not saying the GTOs didn't fall off... just not as quickly.
Has anyone run staggered with GTO up front and GT-R at the Rear. This is the combo they have on sale (285/645 R18 & 305/660 R18). Concerned about potential understeer with the softer rear set up.........
Good question , Black Boss, but I heat up ( and use up ) my fronts so much faster than my rears it seemed like a good compromise. The O stands for Oval use ( i.e. Daytona ) and may be just a bit stiffer, but there is not supposed to be a severe difference in the actual compounding, so figured it was worth a shot?