I bought a Dodge WC52 at one time that had a run flat tyre on the rear. It wouldn't hold air but you couldn't tell by looking. That tyre did a thousand miles with no problems before I came up with a replacement. 
It had to be cut through in two places to get it off the wheel which took a bit of doing. 
 
David
		 
		
		
		
		
		
		
			
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				Hell no! I'm not that old!
			 
		
		
		
		
		
	
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