23 degrees with a strong headwind. I left late but amped it up (largely as a defense against the cold) and made it to work in about 30 minutes. I reeled in and passed 2 other riders and saw only a handful of joggers. I'm really liking my new Kenda 700x30 tires; off road traction but low rolling resistance, to be honest they don't feel much slower than my Conti 28 slicks, just cushier with poorer cornering. I think they'll be a good trade off for winter riding. I finally pinpointed the loud clicking noise coming from the drivetrain. Although the chainrings/chain/cassette were all recently replaced I was hearing and intermittent clicking, like a broken tooth or kinked chain. As it turns out it's the rear derailleur. I'll remove it this weekend and see what I can do about lubing or servicing it. It may not be repairable, finally giving me the excuse I need to convert to single speed. Anybody got any ideas on servicing a derailleur?