Indexing 105 rear gears - doesn't work for largest sprockets :/
I am having trouble indexing my rear gears. I can get it working absolutely perfect for all but the largest three sprockets, making it difficult to select my second largest sprocket.
If I then start fine-tuning the tensions for the largest sprockets, it buggers up the rest.
I had this problem before and after changing my chain. I don't believe my cassette to be worn, although I could be wrong on that.
What could be behind this and/or what tips do you have for getting it right?