My wife got me a new bike from craigslist and I am having issues shifting. I managed to break my chain last week (The quickpin came off somehow) So I got a new SRAM chain and I don't seem to have any sucess. I took it to the LBS and they didn't seem to get it any better.
When riding the chain appears to be rubbing the cog next to it. I tried rotating the barell and it doesn't seem to get rid of the rubbing. The other problem I have is that when I am in the smallest gear it will occasionally pop to the next higher gear then pop back. The derailer is a Simano 105.
Any ideas on what to do?