Quote Originally Posted by bluerider
Thanks DebW. It is a clicking and not scraping. At least I think it is. Yup the sound is still there when I hand crank it. I will take a closer look tonight. I think my chain should be okay as I replaced it about 2 months ago. It's just aggravating to listen to and to avoid it, I end up having to mash up hills!
If you changed only the chain and it had been worn out for a while, it could be the block (cassette) that's worn. These two usually wear out together.

I noticed there are two philosophies regarding chairn-wear in bike wrenches:

A (most common) - Change chain as soon as it's overextended to the 1.0 level (see chain-measure tool).

B (less common) - Don't chain chain until it starts skipping teeth on your cogs. Then change the chain AND the cassette.

My chain has been overextended for a while but it hasn't impaired the capacity of the bike to shift or anything yet. My mechanics wants to wait until it becomes a problem to change it. It helps that he sells me parts at cost. But now I'm starting to think that I might even have to change the cranks when that day comes and even at cost it's going to be expensive (Ultegra here).