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Chain wear question - Only 10 worn links, rest Ok

Chain wear question - Only 10 worn links, rest Ok

I am running a DA 11 speed chain, currently at about 4900 miles of relatively clean, lub'ed use over Baltimore County roads.  I weekly measure the chain using a Park CC3.2 at a couple of different links.  When I checked yesterday the 0.5% did not slip in.  I spun the crank a half turn and remeasured.  The 0.5% went in.  Spun the crank another half turn and the 0.5% did not go in.

I then checked the entire chain and found one section of about 20 consecutive links at 0.5% wear (but not 0.75%) and all the other links were under 0.5%.
I had always assumed a chain on a non-fixie would wear uniformly.  So what is actual wear here, do I replaced the chain a little early?
What chance that this is a defective chain from the factory and that 10 link section was always out of spec.  Who checks every link on a new chain?

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Re: Chain wear question - Only 10 worn links, rest Ok

Just wondering if you are measuring over a removable link. I had a case where everything was within spec until I measured over the removable link. (KMC 10sp).
Then it read as worn past spec. I replaced the removable link with a new one but no change. Had to replace the chain. That made me wonder too. I don't know if possibly the removable link has harder pins that might wear the immediately attached links faster. At any rate I always measure to include the removable link now.
The other thing I would wonder about but would have to test is if the chain is always at the same point on the chain ring, even after shifting across chain rings.If so then it's possible that more torque is applied at a certain point.

Hope there was a new chain under the tree!

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