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Discussion Starter · #1 ·
I am looking into buying 17x8 wheels for my viggen. I know the 42mm offset for the 7.5 inch wheels but what offset would i need for 8 inch wide wheels. Would they rub at all?
 

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here's the math.

8 - 7.5 = .5 inches wider
.5 / 2 = .25 inch offset adjustment.
.25 x 25.4 = 6.35 mm offset reduction

therefore you need 36 mm offset.

Tire rubbing will depend on the size of tire you install. at the recommended 215/40 R17 you shouldn't have rubbing, but with a 8" rim width, the tire will look wider at the rim than the tread. At a 225mm width, you will need to file down the splashshield retention bolts to allow sufficient travel.
 

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Discussion Starter · #3 ·
thanks a lot, but i was planning on going 235/40/17 instead of the normal 215/45/17. I have read info on saabnet.com and people have done 235/40/17 with no rubbing. I researched a little on tirerack and the heights are the same, and the 235's are obviously wider. Would it be rubbing because its too tall or too wide....or both? thanks, will
 
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