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Discussion Starter #1
255/40/17's on a 8" wide wheel (have this now and they are nice n' square)
OR
255/35/18's I have 9" wide wheels but Nitto says this is OK. Maybe a 265?

This is for all 4.

Will the lower profile hurt handling? I've heard some folks say to low and you'll actually loose good grip/stability.

Tires will most likely be Nitto 555's. This is for auto-x and Road Racing on a 2 mile track.
 

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18's will give you slightly more contact patch on the road. The fact that their an inch wider increases that. However, my opinion is that unless you need bigger diameter wheels to clear brakes, you're better off with the lighter, slightly smaller diameter wheel and increasing the width.

If I were you, I'd sell both sets and find a good set of 17X9s.
 
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