RE: Biggest Rear Tire?
I put a 160 Metzler on my 05 Heritage. Didn't have to do any modifications at all. The Metzler is a little more narrow than a Dunlop 160. Anything any wider wouldn't fit, plus it would be too wide for the stock wheel. The 160 is pretty close to the belt and the belt guard. Most folks do this change simply for looks. Even though it seems a minor change, it does look a lot wider. Ride is still the same. life's still the same.