So, is a 6 Ply tyre sufficiant for an 8cwt? According to the table the max load per tyre is about 1000kg. 4x1000 is more than the weight of a C8 + 8cwt load....so sufficiant? Or should one calculate with 3 tyres, in stead of 4? 
 
To add to the discussion I have looked at the old 9.00x13 tyres I have here. 
 
Picture 1 and 2 show Firestone 9.00x13 
marked "S-6" (????), max load 15cwt 
No ply rating 
 
Picture 3 and 4 show Dunlop GP 9.00x13 
marked "S-6"...no other markings that seem to suggest a max. load 
No ply rating
		 
		
		
		
			
		
		
		
		
		
		
			
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				Chevrolet C8 cab 11 FFW 
BSA Folding Bicycle
			 
		
		
		
		
		
	
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