Tires: Tire size for 2007 Lucerne CXS, buick dealer, vehicle manufacturer

Question
Evidently few manufacturers make 245/50/18 tires for this car; ordering new car, previously excellent experience with Michelin, but not available in this size. Don't know what factory installs - any recommendation?

Answer
Richard,

I would go with what comes on the car.  The tires were designed per the vehicle manufacturer's specifications, so it would be best to see how they work.

If you are unhappy with them, the Buick dealer should handle whatever the situation is.