Chain "catching" in Low gear rear de. (Shimano 105)
From having looked through a myriad of youtube videos on gear set-ups that I could see that the shop where I got my bike had set it up completely wrong. In fact, it was all over the place.
I've fixed the front de. so that the chain never rubs, and shifts smoothly and crisply.
The rear mech shifts flawlessly too, but for some reason (which - I can't figure out, a bit noob - sorry) the chain is "catching" when it is in the lowest gear (big cog) when I spin the pedals the right way, and if I spin the pedals backwards it actually hops down 1 or 2 cogs by itself.
Without saying more, is anyone skilled enough to know exactly whats wrong, or should I post a video?