I am currently running my stock 265/40 and 245/40/18s on Apex ARC 8s in 18 x 9.5/10.5. The tires are the minimum recommended for the widths. They work fine, but they do appear slightly stretched to me. When I replace them, I will go with 255/35 and 275/35 or 265/35 and 285/35. You can find the recommended ranges in the specs section for each tire at the Tire Rack website. The narrow end gives crisper handling than the wider end and in the middle is just right, but there are no potential problems unless you go outside these ranges. Even then, people have gotten away with a lot. BMW has put wider than recommended tires for the wheel diameter from the factory and Chevy has put narrower than recommended from the factory.
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