Thanks Iker.
On my Dr. Pulley sliders, my X500 got about 12k miles. That would be about 18k kilometers.
The problem was the mechanic that changed my belt did not check them. They were already worn, and continued until they took out the rest.
I have a different mechanic now. I am not one. Wish I was, but we all have talents, and mine don't go that way.
Since I have to get the whole tranny rebuilt, I'm going to upgrade where practical. I use mine for touring more than racing and high performance.
I like the Dr. Pulleys in some ways. They did take some getting used to. Fuel consumption went up.