18" will certainly give a softer ride, but the 19" on the X3 won't be as bad as on the X1 because the vehicle has a longer wheelbase and wider stance. Generally, the lower profile tires are going to transfer more feedback from the road surface. Actually, in the X3 this might be a good thing, and make it feel a bit more like a 3er in that respect.
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I think it is bad luck to be superstitious
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