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I'd probably go with an 18" drag radial on the rear if it's primarily for street use. I ran 18" BF Goodrich's on mine years ago and my car hooked up pretty well on the street. Tire technology has come a lot further since then and you have several more choices now. If you're just looking for track use, I'd be tempted to go with a 17", which would give you a little more sidewall. I'm sure someone with DR's will chime in.
A 17X9.5" wheel will fit most drag radials well. That's the stock size for front Z06 wheels, so its a pretty easy and cheap size to find.
I'm personally about to put on some Mickey Thompson 295/45/17's. They're a ~27" tire, so a little bit more sidewall that the stock ~26" tires, but it doesn't require any tubing or trimming or anything like most 28" tires do.
I think a 295/45/17 is pretty much the biggest drag tire you can fit on a C5 without doing any modifications to the car.
A 17X9.5" wheel will fit most drag radials well. That's the stock size for front Z06 wheels, so its a pretty easy and cheap size to find.
I'm personally about to put on some Mickey Thompson 295/45/17's. They're a ~27" tire, so a little bit more sidewall that the stock ~26" tires, but it doesn't require any tubing or trimming or anything like most 28" tires do.
I think a 295/45/17 is pretty much the biggest drag tire you can fit on a C5 without doing any modifications to the car.