Old 02-27-12, 01:42 PM
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Originally Posted by JReade View Post
Does it happen in all gears or just one? It could be worn teeth on the rear cassette.
Since it only happens occasionally and you hear it with other bikes, I'm guessing it's a rear derailleur issue; the usual suspect is a stretched cable. .However it could nothing more than a rear derailleur slightly out of adjustment. Adjusting the barrel adjuster is usually a compromise where the chain is centered over some cogs and slightly off center on others, which is corrected by side to side play in the pulley wheel. However if the adjustment is a 1/4 turn off, sometimes the chain mis-shifts up or down, then returns to the proper cog. Campy's shifters have a little quirk that if you have any minor pressure on the shift lever under the brake lever, you derailleur will start to shift again, causing the chain to jump to a cog and than return when you release the pressure.
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