Originally Posted by
Crankycrank
Another possibility is to check your cable for fraying or anything that would cause it to stick.
Cable is ok. Inner and outer cable were also replaced in January. However, the cable doesn't really matter, since in the 10th gear it has no tension in it.
Originally Posted by
Kontact
Do you ride in the cog a lot? 11t cogs wear twice as fast as a 22t cog.
It sure looks like a wear issue with the chain and cog no longer being the same pitch. A worn cog does have a different pitch than it started with, and there is no easy way of measuring cog wear directly.
The 11t is not quite the most used cog. Also read my previous reply to trailangel. I've had this before, when a cog wears out, the chain firstly starts skipping when pushing hard on the pedals, and then gradually also starts to skip when pedaling with less force. In the current situation it started suddenly skipping all the time.