I am experiencing a loud screech coming from the rear of my 07 Tarmac.
This only occurs when I am descending in excess of 30 miles an hour.
I noticed yesterday that when this occurs my chain looses all tension and ends up laying against my chain stay. Thus, I shift to a low rear gear to coast and when I need to pedal shift up.
I had my ksyrium elite rear hub serviced after this first happened but I think I misdiagnosed the cause since it started occurring again.
Now I am wondering if it could be a pulley.