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Discussion Starter #1 (Edited)
Sorry, after reading this I realized it was a bit misleading as far as the context. I was wondering if anyone had successful dropped down to 16s for road course. I know that the IS/Altezza platform is a little hefty so brake upgrade limit wheel sizes but figuring the few that stay with the stock setup (17"). I have been contemplating going down a size to decrease rotational mass and possibly increase a little acceleration, I know some of factory wheels came as a 16. If you did what specs were you able to go with, were there any noticable differences in the change.
 

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Although I would not disagree with the comment for rotation mass and overall diameter for gearing, keep in mind tire availability. Unfortunately 16's are all but dead so tire selection is fairly limited.

Heck, even 17's the pickings are getting slim.
 
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