Hi
Another new road bike question. I just took my bike (cannodale R500 fem) in for its first tune up and service
I was having some trouble shifting gears and was occasionally getting a rubbing noise from the chain.
When they gave me my bike back the Bikes store guy said I needed to trim the gears if it is making the noise -which he explained was sort of a half -shift.
I said OK -but I am still kind of confused about why I need to do this and which gear. Just the rear? Up or down?
Does anyone have any experience with this?
Thanks!