Trip coming up, the existing Avon didn't have enough tread to go the distance.
So I bought and installed a Michelin Commander reinforced bias ply 150/80-16 77H. It seems these are distributed through the Harley Davidson organization, but now there's one on a Concours. 7mm tread, 6mm to the wear bars, 28g to balance.
Haven't ridden it yet, more info to come.
If anybody in the Ottawa ON area needs a free Avon Azaro rear with about 2000km life remaining, let me know.