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			Probably 80% due to the fact that you now have exceptionally well supported sidewalls and a very flat tread which will transmit every road irregularity straight through to the steering. 205/55s are not very well supported on 6" wheels and the sidewall moves back and forth much more. 
 
The other 20% might be the different offset.
		 
		
	
		
	
			
			
		
		
		
		
		
			
		
		
		
		
		
	
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