I thought it was a little off also. I just wanted to go one step up for grips sake. I am getting the Continental Extreme DWS. I wanted 255-40-18 in the front and 275-40-18 in the rear. They said it wont work. Tire Rack on the other hand said it was fine. If they didn't match Tire Racks price I would've just ordered them online. These tires have a 50,000 mile thread wear warranty. I always had a good experience on my old e46 M3 with continentals. Thanks for the quick help fellas.
01 M3 Coupe 6spd - sold
08 M3 Coupe 6spd - sold
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16 M3 Sedan 6spd CCB