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				Originally posted by David_Hayward  
Was the 11.00 x 20 a later version of rhe 10.50 x 20? 
			
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  The 3.7in AA gun was fitted with 11.00-20 tyres (we have 1943 marked ones on the AA emplacement guns), which I would presume was in common with the Matador that hauled it.