Hey Marc, 
 
If they don't have chunks missing and you get the tyres, you could have them filled so they become solid inside. They have a process of injecting something that hardens up to the consistency of soft rubber similar to silicon. Its solid but not hard as a rock so still gives a decent ride. And it is supposed to help hold the old tyres together so the sidewalls won't split and come apart. 
 
If I hard wartime rubber, that's what I'd do to preserve it.
		 
		
		
		
		
		
		
			
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				David Gordon - MVPA # 15292 
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