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More tire choices (and cheaper) with 18".
That being said, my track wheels and tires are 19".

 

More tire and wheel selection with 18's and better prices. I have CCW and OZ 18's.

 

When I bought my last set of wheels, my priority was maximum performance. Looks were second place. GMG recommended 18's for performance, which is what I went with.

 

I run 18" wheels as well, very limited amount of track tires in 19"

 

I think the tire option differential between 18 and 19" is closing. Michellin, Pirelli and Hoosier's are available for either. I have both and run 19" in the rain with treaded tires, and 18" in the dry with Hoosiers. That's overkill for my needs, but don't tell my wife I said that.

 

You need these, of course I'm biased. I used them primarily for street, but did a couple of track sessions with them with MPSC's mounted. Light, strong and clean.

https://www.6speedonline.com/forums/...997-2-gt3.html

 

If you got any questions about HRE options, feel free to contact me.

 

18" all day long. Much cheaper.

 

First question: do you drive or trailer to the track?

-If you trailer than 18 inches is the better option (Hoosiers, full slicks, Kumho V710, etc.)

-If you drive to and from the track (like me) then there are basically no tire choices other than R888 and Nitto NT01. Since NT01's tire sizes are not right for the 997 and may trigger Ice Mode in ABS I'm afraid to try them out.