So, I have a giant OCR 2 w/ tiagra/105 components.
I just started getting back onto my bike after a long absence (knee surgery and broken foot). I'm riding the bike on a cyclops trainer right now.
Here's the problem:
If I am on the smallest chain ring on the front, and about the 3rd biggest on the back, the chain will sometimes slip into another gear then fall back into place. This happens fairly often, and also happens in a couple other gears as well. In addition, if I am on the middle ring on the front, and the 2nd largest on the back it will sometimes slip as well.
The front doesn't seem to slip, only the back. I'm wondering what type of derailer adjustment I should need to do. Thoughts?