Thanks, Sheldon.

I have a question regarding short-cage vs long-cage. My understanding (from the inimitable first poster to respond to this thread) is that the cage length has nothing to do with cog capacity. That is to say: a short-cage derailer will not generally handle a 32 or 34T cog . . . however, not necessarily because of the cage length, but because of the length of the parallelogram/arms. But neither will any old long-cage derailer simply by nature of it being long cage. While I don't think what you have contradicts this, it might be nice to see this issue explained further and clarified.

Specific case of why I bring it up: A while ago I was shopping for a new RD and a guy at a LBS sold me a long-cage Shimano 105, telling me "yeah, it's long-cage, it should work" for my 32T cog. It didn't. Even with an extra-long B-screw adjusted to the maximum, I was unable to adjust it to prevent the jockey pulley from hitting the largest cog, not even close. I exchanged it for a "mountain" derailer and had it working within about 30 seconds. The derailers had the exact same cage length, but different parallelogram size.

Thanks. Now back to carpet-smoking.