Oh yeah, forgot to mention, my rr. deraileur froze up about 2/3 rds of the way into my evening commute yesterday. It was coated with chunks of frozen slush as was the bottom bracket shell. I've had this happen before and, luckily, I was stuck in a good gear. I've never really worried about it before but, how could I prevent it if I was so inclined? Lubricate the der. with some kind of anti-freeze or, keep a heat source (lighter) handy to manually melt the ice? Not a big deal, just curious how others deal with it?