Uffa - waaaaay sore this morning lol.

Chain was KNC X10 SL. I don't want to blame the chain - I've used those chains for a bazillion miles without issue. Everything can break. I tore a cassette cog in half on a Campy cassette once(which is what Rowan is referring to). The mechanic was like WTH? If anything is mechanically reliable it is a Campy cassette - just one of those things. Now where's the ibuprofen...