I went down to the Suzuki shop a couple of months ago to order an
Avon rear... he probably uses Parts Plus, I'm not sure. They were on
back order till the end of the year. I ordered it anyhow. It came in
sooner than expected. When I thought I might get stuck with no
rear tire on the 1500, I ordered a Shinko SE890 from J&S. It came
in a few days.
Now I have two new rear tires

...
I started buying tires from the Suzuki guy when I stopped mounting
them my old self. Those low profile tires on the 1800 kicked my rear
end. He got me a new front for the 1800 and put it on a week or
so ago. He had a hard time with it even though he has a giant
industrial machine to mount it for him. I was happy to stand there
and watch

...
Anywho... ordering one of these unavailable tires now might result
in you getting one sooner rather than later...
-Mike