I have a '08 SG with 22,000+ miles. Thinking of a HogPro Torque 7 19" or 21" up front. Was wondering if I really need to change my 16 rear or can I keep it with the Dunlop and use a Metzeler or Avon in the front? Been real happy with the 16's and Dunlops but would like more bling up front. With the 19 or 21, I am sure to lose some agility. Any thoughts of someone who has switched from the 16 to the 21 especially?