The rotary in question was in Newton, MA at West Roxbury Parkway and Hammond Pond Parkway (not sure how to copy and past or link to a map).

I actually don't find rotaries bad at all. The key is to position yourself in the middle of your incoming road and singnaling "left" before entering and well into the rotary. Drivers get that. It also helps that I'm going down hill into and for the first half way around the rotary. If at speed, you can take the corner faster than a car.

squeakywheel, the Nashbar stuff should arrive tomorrow. Once I have this bike back up, get the Snowmuter built up, I've got my eye on the RedLine 925.

NoRacer, I do have a master link on the chain (but not a spare) and I carry a chain tool with me. I just didn't want to hassle with it in the dark. I also knew my wife was already out with the kids so the emergency evac was easy.

The take home message for me is that if the broken chain is in busy traffic, leave it for dead.