I recently had the dealer change my worn out stock rear tire with a new 150mm metz. Now I am getting an odd noise when I am off the throttle coming to a stop. The noise disappears when I pull the clutch lever in. Any ideas before I take it back to the dealer?

If it matters the dealer also changed the rear brake pads when he did the tire swap.

 

The belt may be deflecting into the tire and when you pull the clutch in it doesn't have any load on it and ceases with the deflecting bit.

 

Check you Final Drive Belt Cover\Guard on the inside & ck air pressure - Found mine rubbing on my '01 RKC - I ended up just removing the cover\guard