Join Date: Jun 2005
Location: Dayton, Ohio
Bikes: 1975 Full Campy N.R. Centurian Super Lemans,1984 Focus Vintage pre susp. mountain, hardtail,suntour xc sport, many treks, diamondbacks, and, 1950' crusier J.C.Higgins,triex (road) and kakakura silk (road)
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This Sun tour derailer uses a cable and a spring. The cable pulls it to the bigger sprokets, the spring to the smaller sprockets. the paralligram has to be oiled in order to be smooth , friction free, and fast. wd-40 is a penetrating oil and will work it's way down to the friction areas, but will over time evaporate and be gone. so use a thicker weight oil for all pivot points. use a needle applicater so as to not waste oil and make the derailler overly oily which will attract dust and dirt. Oil used properly can polish metal and also prevent rust in moving parts, to much oil and you just make a mess and attract grime. The Vx is a Great rear derailer and sounds like to me that it's time for some fresh cables and a clean chain too while your at it. cold weather is hard on bikes.
Use this time to overhaul your drive train. good luck!!