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I did my first track day in my 997.2 S, and am hooked.  Next up is to avoid grinding down my street rubber, and move to DOT approved dry tires and wheels.  I currently have 19" wheels on the car, but am thinking of going to "-1" or 18" wheels as there seem to be more tire options, and they are a bit less expensive.  I've got the following questions:

 

1. What wheel widths should I be looking for?

2. What is the corresponding tire sizes?

3. What offset is 'right' and if right is different from 'acceptable' what's the range? 

4. Any tire recommendations (folks at the track were raving about the Nittos)?

 

Thanks!

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