Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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New chain/old cassette is classic for skipping. The age numbers you give wouldn't normally have me expecting it, but it's possible, especially if you ride those smaller sprockets the majority of the time.
One indicator of wear would be to measure your old for stretch (if you still have it). Another is to examine the sprocket itself and see if you see any undercutting or hooking of the back edges (where the rollers lean when pulling the sprocket).
Often minor skipping resolves by itself as the new chain wears a bit and becomes more forgiving of the bad sprocket. You can get immediate relief by carefully grinding a bit off the top/rear corners of each tooth of the slipping sprocket.
In the future, keep the chains properly oiled, and monitor their condition more closely. If they stretch much beyond 1/2%, don't replace them. It's probably too late for the cassette, and you might as well ride the pair together until about 2% stretch at which time you can toss the pair.
BTW- it might not be classic new/old skipping, but misadjustment of the RD limit, or a misaligned hanger, or the shape of then inner plates of the new chain.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
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