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These are the best tires you can buy for the street - period. I've had mine for over a year and am amazed at how well they wear for such sticky tires. Goodyear nailed the right compound perfectly.
I just put them on my C5 a month ago and they are great. I have had the OEM runflats AND the F1 Supercar tires that are OEM on the C5 Z06 to compare them to. The GS-D3's are much better than the previous tires mentioned.
I am now going to buy a set for my little 06 Honda Civic Si
These are the best tires you can buy for the street - period. I've had mine for over a year and am amazed at how well they wear for such sticky tires. Goodyear nailed the right compound perfectly.
I dont think the ZPs perform as well as the regulars because of the hard sidewall needed to be a ZP. that is why many people do not replace runflats with ZPs basically same concept.
I run Pilot Sport Cups - a totally different animal - but feel they are the best handling street tire out - of course they are r-compound tires which makes a big difference.
I think for an overall street tire for most users the GSD3 is a great choice.
I put them on a C4 and was very impressed. Smoother, quieter, and better traction. Very cool looking tread design. Sold the car to buy the C5 so I do not know about wear characteristics. If they came in runflats there is no question I would put them on the C5. I still have 10000 miles to go on the runflats and plan to go with runflats again.