Howdy- to cut to the chase, looking at a 170/70-16 to replace the 160/80-16 on the rear of a 2000 V92C. Tire size calculator shows diameter change as -0.7 inches (would sit about 1/3" lower) and width change of +0.4 inches (less than 1/4" wider each side). Is there any downside to worry about in doing this? Bike is pretty much stock; not lowered, etc. Thanks for your thoughts.