Ok guys, having a bit of a problem here. Did my MOT last week and noticed that I suddenly had quite a slack on my chain. So I went to the garage and adjusted it and it all seemed fine. Now, my chain and sprockets isn't exactly new. But they should be ok for at least another 2-3000 km. Yesterday I drove a couple of miles on gravel (my stupid brother insists to live in the woods), and today when I was about to wash the bike I discovered this.
I could move the rear sprocket carrier quite a bit (not just the sprocket itself), and the chain got quite a slack again. I checked the adjustment and it's still on the marks that I last put them. I went home to get some dinner and when I checked it again now I can still the move sprocket carrier, but not as much that I could before when it was wet...
Can a worn out cush drive cause all this or could it be something more involved?
I checked the sprocket carrier on my friends bike. It's definitely more solid and I can't move that around the same way.