Found these 2011 CX9 wheels for sale for $NZ 1385.00 so I bought them. Came with 225/30R20 Achilles ATR Sport tyres. I was a bit concerned about the fitting of them because they were advertised as +36 offset. When they arrived I was relieved to find that they are actually +45 offset. So the overall width change was only about 14mm wider towards the outside of the car. I was still concerned after they were fitted, so I loaded the boot up with 235kg of steel to simulate 3 people in the car, and they only rub the guards if you drive round corners quickly. In normal driving situations (if you had 3 poeple in the back) you really wouldn't drive like that. So I'm really happy with the look of the car. The car has standard suspension. I weighed the new wheels and the wheel/tyre combination is 1.7kg heavier than standard 18" wheels, and the acceleration feels slightly slower. Fuel consumption has gone up only a little bit. The tyres are not good in the wet, and now I really appreciate how good the RE050As were. I think when the 225/30's wear out I'll go up to 235/30 as this size is almost identical to the original wheel diameter. I guess one day I might get them painted in shadow chrome.
The first two pictures are with 235kg in the boot. The rest are without.