Oh dear. I refer m'learned friend to my earlier statement regarding Mr Terry Tryhard.
Even allowing for the extra width, I reckon 235/40x18 tyres put the metal 20mm closer to the road than the 205/55x16 tyres on mine. I vividly remember the unpleasant surprise of an 18-inch-Nebula-wheeled S60 courtesy car - which at least gave me a chance to make the same decision as Mikey without having to buy one first.
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