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Most run 18mm and 20 mm. I am running my Bonos since day one on my stock wheels and tires (18in). It looks way better, esp with the 19in sport wheels. I am now lowered about 1.75 inches and now I want 20mm in the front and 25mm in the rears. That is mainly because of the lowering. Here is my car lowered with 18mm spacers on the front and 20mm in the rear and on stock 18 in wheels.