I am building a bike and I am using 10 speed Shimano 105 shifters.
On the back I am using a 11 speed 105 rear derailluer (because is the only one I have at the moment).
The cassette I am using is a standard SHIMANO TIAGRA CS-HG500-10 10 SPEED CASSETTE 11-25T.
Unfortunately, I am having some problems: when in biggest cog or second one, the chain moves out of the tension pulley and gets stuck (by the way the chain is a 11 speed chain, so width should not be an issue).
Does it seem like there could be something wrong with the chain line?
Any of you knows why it happens? Did it happen to you?
Thanks already for your input!