Not Ranked 
   
		
		
			
			
			 
			
		
		
		
		Sean - from what I have been told and observed: 
 
SR series - milder cam..."S treetable" 
R Series - radical cam ..."R acing" 
SR TW series (Twisted Wedge cam) - inbetween SR and R (flat torque curve) 
 
You can order any series with the Polished Component Package. I chose not too. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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