Tires are a vexed matter for long distance riders. The Michelin Anakees that came on the bike are very sticky but rarely lasted more than 3500 miles for me on the rear. I don't believe I am strong on the wrist, but wear indicates otherwise.
I then went to Metzler ME880, that I have had a good run with in the past on BMWs. They were ok.
After that, I chose the new Michelin Pilot Road 4's which have been my favorites. There are two models, the "Trail" which is softer in the middle and ideal for the front tire (14,000 miles easy) and the "GT" which is better on the rear, it being a little harder in the center stripe. I have used both on the rear tho, and get about the same number of miles around 6000 to 7000 for a rear. So I used two for IBR.
Right now I have a Heidenau K60 on the rear of my bike. For anything off road it is excellent. Also in hot weather on the hard-top. In November last year, I crashed my bike in very cold conditions with snow on the road, using this tire and believe in part, the tire was to blame, as my counter-steer did not work. For wear they are excellent, a lot better than the PR4's, but you need to know what you are riding. In my view, most people who don't like the K60 are not great riders, but then I might be biased.
I did consider a car tire for the IBR in 2017, and received considerable flack from the forums on even thinking this! But it would be good and unusual on a GSA!
