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			The difference in mass can also be shrunk a little bit when one calculates the weight of the tires into the overall weight.  18" tires are going to be a little less heavy than their 17" counterparts, if the other dimensions are the same. 
 
I wouldn't stick with the 17's, myself.
		 
		
		
		
		
		
		
			
		
		
		
		
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