You beat me to it. The TR91 is really new here, I had a handout from Dunlop that I received at the New York motorcycle show in January. I went looking for them, even the Dunlop site doesn't show it yet. They come in the correct sizes for the Tenere, and it is just now showing up at various distributors. I see them at Dennis Kirk, and I'm sure they will be other places as well by the time I need them.
Since I plan on using my Tenere as a touring bike that can do off-road, rather than an off road bike that I tour on, I'm going to stick to this type tire. The Bridgestone Battle Wings are OK, and handle well enough on the dirt I've tried them on, but I have had better luck with Dunlops over the years, so plan on giving the TR91s a shot unless something better shows up when I go buy replacements.