Just get a patch kit... I never use OEM rims for my winters, I just downsize rim and go to a taller sidewall on steelies. Makes shopping easier and cheaper, the larger the rim the more expensive the tire.The dealer in Seattle/Bellevue told me that there really weren't many good options for the 18-inch "run flat" tires in an all-season configuration. Is this correct? Or if you switch to regular tires, are you just crossing your fingers and hoping that you don't go flat (since the CLA 250 doesn't have a spare)?