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True chain skip occurs when a new chain installed on worn cogs and even them it usually occurs on only one or two of the most-used cogs. It does NOT just start occuring out of nowhere, particularly if the chain has been properly maintained and not ridden in extreme conditions.

Pedaling hard and shifting to a smaller cog can result in a clunky shift. So can something as simple as having too little shift cable tension. Try applying at least 1/4 turn more tension.

It's rare for a Campy chain to exhibit much elongation, so the common length check with a precision 12" scale will NOT tell you if the chain is worn out.

Campy recommends using calipers between the roller over a 5.200 inch length and replace the chain when that diemsnions reaches 5.220 inch. That is very conservative, but if you use only one chain until that dimension increases to 5.240, you may get REAL chain skip when a second chain is installed. I avoid that by alternating the use of several chains and rotating when each is about half worn. That avoids chain skip.

Chain life varies a lot depending on riding condition and maintenance, but I've got as much as 6,000 miles from a Campy 10 chain. I'd consider anything less than 4,000 quite poor life.
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