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I don’t recall seeing any serious track drivers using the 666s for exactly the reason you mentioned - there are very few tires available in those sizes. Such a narrow sidewall also risks a puncture or wheel damage when bombing over curbs.
I run 19s on the street and 18s on track to give the car a little more compliance. No alignment changes necessary. I’d recommend going to the 18” 513Ms if you’re looking for a lightweight wheel that will clear iron brakes. It seems the 19s have the greatest selection of track tires, though.
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