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			Those tire and wheel sizes are a mismatch and no way you are stuffing 305s under the wheel well without adding widebody flares.  225/265 are standard sizes while 245/275 will fit if you choose offsets carefully.  
 
Shop tirerack.com for a better approach to fitment.
		 
		
		
		
		
		
		
			
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				2009 Cayman 2.9L PDK (with a few tweaks) 
PCA-GPX Chief Driving Instructor-Ret.
			 
		
		
		
		
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