I cant understand it. At the weekend I changed my front tyre as it was as worn as I dared let it get. So now, the only difference is that I have a new front tyre, with more grip than the last one. 
How does that make me faster!? Cycling home, even despite the headwind, I made much better time than I usually do!
I would expect, the more grip, the more friction therefore more resistance
	
		
			
		
		
	
			
			How does that make me faster!? Cycling home, even despite the headwind, I made much better time than I usually do!
I would expect, the more grip, the more friction therefore more resistance

 
				 
 
		
 
 
		

 
 
		 
 
		 
 
		
 
 
		 
 
		 
 
		