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If you move from base wheels and tires to Z51 wheels and tires, the rolling diameter is the same so no change.
The only difference in base/Z51 is the 18/19" vs 19/20" wheel (the width of the tires are the same) but that difference in diameter is offset by a smaller profile tire on the Z51.
If you move from base wheels and tires to Z51 wheels and tires, the rolling diameter is the same so no change.
The only difference in base/Z51 is the 18/19" vs 19/20" wheel (the width of the tires are the same) but that difference in diameter is offset by a smaller profile tire on the Z51.