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so if i run a thicker tire say" 235/50.17 i should be fine?or would i need to go with a 55 series tire
No, that's not the problem. What the others here are saying is that the wheel will look like it is too far inside the wheelwell. Imagine how a spacesaver spare looks on a car - too narrow AND it sits really far in.
I would just sell or trade for GS wheels instead of trying to fit the IS wheels.