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Backspacing on ZR2 wheels

chevy2tuff2006
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newdude Senior Enthusiast

newdude

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GM doesn't have a spec published anywhere yet that I can find.  I'm gonna take a wild a$$ guess and say its +44mm like the standard wheels or somewhere about +40-44mm.  They are the same 18x8 as the stock 18s so +44mm isn't out of the question.  

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Epsilon Plus Enthusiast

Epsilon Plus

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Are you sure they are 18x8? They are running 12" wide tires on them (305/70). Discount Tire wouldn't mount anything over an 11.5" on a 8" wheel for liability so I'm sure GM wouldn't either. Probably more like an 18x9 or 18x8.5.

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