Originally Posted by
MinnMan
The symptoms suggest you waited too long, but I would have thought that 0.75 should be the right time for replacement. 0.5 would be very conservative.
I generally change the chain at 0.75 and considered 0.50 half life and check it every couple of weeks. I may have not checked it for the last month because I was startled when I did check it and it was slightly more than 0.75. So you could say I blew it and waited too long.
In any event it must have been the cassette because I replaced it last night and when I rode today shifting was crisp and quiet so problem solved.