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OK, I'm probably being lazy here. But I can't seem to find a thread on this subject. I'm looking for a comparison of original equipment tire sizes for base C6, GS, and C7. Really looking at tread width here.
From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
Not sure what you are looking for but be aware that the computers on this car do not like people changing tire size ratios if all 4 are not changed equally. If you start changing the width you are going to also probably be changing the diameter so front and back need to be changed the same ratio or the car will decide you have one set slipping and it will start cutting power and applying brakes or reducing braking effectiveness.
Nothing wrong with changing tires. Lots of people have done it. But some people have ended up with cars that were undrivable. Now if you are just asking what tire sizes are on various models for information only, then you are just being lazy and I'll let someone else do your homework for you.