Hello,

Just got the chain and cassette on my road bike replaced three weeks ago (normal maintenance). Was riding today on a flat road when I started to notice that my chain was skipping -- as in, it was almost like the bike was shifting for me without me doing anything. It was annoying but it only happened a few times so I didn't think much about it. Then out of the blue, there was a cracking/smashing noise and I stopped (didn't crash, thank goodness) and discovered that my chain and derailleur were both broken.

Here's a link to some photos so you can see what it looks like -- it's hard to describe.
http://www.facebook.com/media/set/?s...1&l=ebf4367e4d

So my question is... do you think this was caused by the new chain/cassette? If not, what would cause something like this to happen? I didn't go over any pothole, significant debris, etc., and I'm pretty sure I wasn't shifting when it happened (I'm not 100% sure about that, but like I said, the road was flat, and our group was riding a steady pace).

I want to go back to the bike shop armed with at least a little bit of knowledge. I was riding with a group, and everyone was shocked and said they'd never seen anything like this before.

Thanks for any thoughts...