Can't comment on your rubbing question.
But when you put the 18's on let us know what it does to your top end torque and how your cruise control likes it, thanks.
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Going from 215/65/16 to 255/55/18 you gain 51mm (bit over 2") in height and your revs go down.
Going from 215/65/16 to 255/60/18 you gain 76mm (3") in height and your revs go down even more.
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