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Old 09-11-2016, 07:44 PM   #1
xsv
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Faulty Aftermarket Sprocket Nut

Went check on my bike today in the shed and found this:

1DBF5063 A1DF 4E10 9CA0 B354427710D3 zpsf98dtykz

Haven't rode the bike since July 17. The bike has been sitting on stands in the shed. Somehow the nut split in half and I found half of the nut on the floor and the other half still on the bolt.
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Old 09-11-2016, 08:41 PM   #2
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Old 09-11-2016, 08:44 PM   #3
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over Tq . FYI unless your racing use no Alum drive nuts
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Old 09-11-2016, 10:48 PM   #4
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over Tq . FYI unless your racing use no Alum drive nuts
I torqued them to spec: 43.5ft/lbs.
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Old 09-12-2016, 01:24 AM   #5
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Quote:
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I torqued them to spec: 43.5ft/lbs.
That spec is for the hardened steel stock nuts. Those fancy yellow anodized ones are aluminum. No need for those unless your trying to shed ounces for racing, and even then I'd say they're iffy.
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Old 09-12-2016, 04:42 AM   #6
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are they a brand name or chinese knockoff?
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Old 09-12-2016, 08:11 AM   #7
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Old 09-12-2016, 08:55 AM   #8
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I noticed a lack of thread locker as well. Even gasket sealer is better than nothing.
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Old 09-12-2016, 09:01 AM   #9
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Good thing that didn't explode on you while you were under load and riding hard... That is scary looking (even though it's only one nut).
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Old 09-12-2016, 09:57 AM   #10
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Every time I replace the chain I also get new sprockets and nuts, but I always buy the one piece nuts. Sure, you can snap these two piece ones on right against the sprocket and save a little assembly time, but problems start the minute you take the wrench off.
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Old 09-12-2016, 11:56 AM   #11
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Quote:
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are they a brand name or chinese knockoff?
the brand is Pro-Bolt

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Originally Posted by pbfoot View Post
I noticed a lack of thread locker as well. Even gasket sealer is better than nothing.
I used blue Loctite
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Old 10-01-2016, 01:57 AM   #12
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Quote:
Originally Posted by Track_Graphics View Post
Every time I replace the chain I also get new sprockets and nuts, but I always buy the one piece nuts. Sure, you can snap these two piece ones on right against the sprocket and save a little assembly time, but problems start the minute you take the wrench off.
After I removed the nut that split in half, I tried to remove the next one off and the core completely stripped from the nut and the threads were stuck on the stud. I was able to remove the core from the stud with some pliers. I slowly removed the remaining nuts and none of the cores stripped from the nuts. Replaced all the nuts with the OEM nuts and called it a day.
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Old 10-01-2016, 03:38 PM   #13
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thanks for sharing, would never put an aluminum nut on something as critical as the front sprocket. did you save your OEM nut?
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Old 10-01-2016, 05:53 PM   #14
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Old 10-08-2016, 12:41 PM   #15
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Quote:
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thanks for sharing, would never put an aluminum nut on something as critical as the front sprocket. did you save your OEM nut?
yeah, i saved the OEM nuts them and put them back on

IMG 5600 zpsgzhadrjy

Last edited by xsv; 10-08-2016 at 12:44 PM.
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