Capo #1 and I did the 25-mile / 40km round trip to and through the Torrey Pines State Reserve, going up the steeper so-called "inside" Torrey Pines Park Road, for those familiar with the area. About halfway up my chain began to skip on my largest (23T) cog. The only damage was to my ego, but now I was faced with having to do a second-gear (38/21) start on about a 10+% grade. Fortunately a couple of hikers said, "Want a push start? It's Tour de France time!" They got me going, and I continued to the top.
When I got home I replaced the chain, which had just barely reached Sheldon's magic time-to-replace length of 12-1/16" per 24 half-links, and both derailleur pulleys, which were surprisingly worn down. My Campagnolo derailleur now sports Shimano pulleys salvaged from my junk parts bin, but everything seems to be working much better now.
http://www.mapquest.com/maps?name=To...SS&id=13931176
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069