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Cracked SRAM PC-850 chain sideplates

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Cracked SRAM PC-850 chain sideplates

Old 08-10-12, 12:52 PM
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folderfan550
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Cracked SRAM PC-850 chain sideplates

I had a SRAM PC-850 chain on a 1995 Trek 850 with 7-speed freewheel and found two cracked chain sideplates whileg cleaning. Is this a common issue with such chains? The chain is less than 2 years old and the bike ridden only in a mostly flat city. I believe the chain it replaced was the original so expected it not to fail so quickly.
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Old 08-10-12, 01:13 PM
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I run SRAM 8 speed chains and I've never had that issue. Do you shift under load a lot or cross chain really bad? Those are common causes of chain breakage.
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Old 08-10-12, 04:37 PM
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Get a kmc, those never die.
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Old 08-10-12, 05:12 PM
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I don't ride in the extreme gear combinations and tend not to shift that often as I'm riding in a mostly flat area. Looked at the chain again and found another cracked plate. All cracks are on the same side of the chain. I was at a LBS the other day and picked up a SRAM PC-830 which was all they had. Wondering if I should return that and get something else at a different shop. At least I glad I noticed the cracks before the chain let go in traffic.
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Old 08-10-12, 05:47 PM
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Originally Posted by ultraman6970 View Post
Get a kmc, those never die.
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Old 08-10-12, 06:40 PM
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Originally Posted by ultraman6970 View Post
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OP, what are you using to clean your chain?
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Old 08-11-12, 10:47 PM
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Originally Posted by AlphaDogg View Post
OP, what are you using to clean your chain?
Good question, since anything alkaline like Simple Green can severely degrade the strength of thin steel parts in a matter of hours.

That said, I have only seen such cracks in TaYa("Bell") branded chains, SRAM branded chains, severely rusted chains or chains soaked in alkaline cleaners.
Almost as often as not, the cracks are spotted before failure, which seems weird to me.

I use Shimano and KMC chains, which don't break normally. KMC makes some of Shimano's chains btw.
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Old 08-11-12, 10:50 PM
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Originally Posted by dddd View Post
Good question, since anything alkaline like Simple Green can severely degrade the strength of thin steel parts in a matter of hours.
Also green mineral spirits is the same way.
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Old 08-12-12, 08:42 AM
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Just to paraphrase That Other Thread, it was the traces of road salt ("The chain is less than 2 years old") that really did the damage when in solution with the Simple Green/green mineral spirits...

But yeah, real mineral spirits are the way to go. I haven't had any cracks in my SRAM chains yet!
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