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chain jumping; quite frustrating, help?
eric- and even now, just riding along on the flat
at 15-20 mph without any unusual pressure applied, it will jump. the especially disconcerting part is all of a sudden, it feels like i just shifted into neutral of a car, with almost no resistance at all. i just start spinning like crazy. BRBR The chain is dancing or skating on top of the cogs rather than having the chain engage the cog teeth. I think a rear der problem, with the top pully or the rear der alignment..Something is not keeping the chain on the cog selected. Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
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#2
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chain jumping; quite frustrating, help?
eric paul zamora wrote:
i have a 1983 bianchi campione d'italia which i upgraded to a regina cx 12-21 freewheel around 1984. probably had a regina oro chain at the time. a couple of months ago, i brought it out of retirement (i'm 36 and looking to lose weight). almost immediately, i bought a sachs PC-58 chain. installed it with the same length. i was reminded of that little problem when the skipping continued. strange thought i. well, maybe it's that particular worn cog. so i bought a regina america 6 speed 13-22 freewheel which showed no wear to my eye. surely that would solve the problem... i installed it this past weekend and it still skips (the new sram chain probably had about 200 miles with the old cx freewheel). the problem manifests itself by generally jumping to the next smaller cog, but usually moves to riding along the top of that next cog first. it's very The new chain AND Freewheel should have solved the skipping problem (unless the "new" frewheel is worn). The auto shifting could be a different problem. Make sure the under BB cable guides are clean and lubed, and maybe replace the short housing at the rear der. If all else fails, treat yourself to a modern derailleur. Since you're using friction shifting, any modern derailleur will work and will give much better performance than the 20-year-old Campy. Art Harris |
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