hi there im after some advise regarding my specialized sectur road bike, iv covered approx 1300 miles on my bike from new and now the chain keeps going slack and i dont think its the derailer arm attached to to back wheel? not a lot to go on but any ideas
i have kept the bike in good condition and well oiled etc.
	
		
			
		
		
	
			
			i have kept the bike in good condition and well oiled etc.
 
				 
 
		 
 
		 
 
		 
  
 
		