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Bent Chain Link

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nameused Offline
Senior Member

Sacramento, California
Posts: 189
Joined: Oct 2010
Post: #1
Bent Chain Link
Alright so yesterday as I was looking at my chain I noticed that one of the links(outer plates) was bent. Now I've never seen this before, so I just took the bent one out and put another link in. Now today when I was checking me tire pressure I looked at it again and noticed a link was bent again.
The outer plates are bent off at an angle which makes the chain be off at an angle for about 10 links after that one. Any idea how I could bend the link? I've never seen it before.
Its a Shimano 8 speed chain if that matters any.
Apr 3, 2011 01:57 AM
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Bill Offline
Veteran Member

NY,USA
Posts: 2,765
Joined: Sep 2009
Post: #2
RE: Bent Chain Link
Check the truing of your chain rings and cassette gears. If at every 10 that is the only thing I can think of other then one of the teeth are funky? Wait the maybe one other thing I had a problem with a few months back which was a really badly machined chain!!!

Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Apr 3, 2011 07:56 AM
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nameused Offline
Senior Member

Sacramento, California
Posts: 189
Joined: Oct 2010
Post: #3
RE: Bent Chain Link
(Apr 3, 2011 07:56 AM)Bill Wrote:  Check the truing of your chain rings and cassette gears. If at every 10 that is the only thing I can think of other then one of the teeth are funky? Wait the maybe one other thing I had a problem with a few months back which was a really badly machined chain!!!

Me and a friend looked at it today and noticed the middle ring in the front was bent. Not sure how that happens...? Can I just bend it back somehow or am I kind of stuck here?
Apr 4, 2011 08:39 PM
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dave_sd Offline
Senior Member


Posts: 109
Joined: Aug 2010
Post: #4
RE: Bent Chain Link
If you can bend it back so it's straight, it's all good! Having the middle ring bend while the big ring is fine is kind of strange, though. The only thing I can think of that would cause this is hitting a rock or log while mountain biking, but that should affect the big ring, too. How out of whack is it?
Apr 4, 2011 08:52 PM
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nameused Offline
Senior Member

Sacramento, California
Posts: 189
Joined: Oct 2010
Post: #5
RE: Bent Chain Link
The big and small rings are fine. We were thinking maybe something got jammed up in between the big and middle ring and bent the middle ring away from the big ring.
Any suggestions on how I could bend it back?
Its bent enough that sometimes when the ring gets to the bent section the chain will ride on the outside of the ring in that one spot, but be on the rest of the ring.
Apr 4, 2011 08:56 PM
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dave_sd Offline
Senior Member


Posts: 109
Joined: Aug 2010
Post: #6
RE: Bent Chain Link
You might have to take it off the crank, put it in a vise, and use an adjustable crescent wrench on it. Lacking access to a vise, you may be able to take off just the big ring to get access to the middle ring with the wrench. New chainrings aren't all that expensive, either Big Grin
Apr 4, 2011 10:02 PM
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Bill Offline
Veteran Member

NY,USA
Posts: 2,765
Joined: Sep 2009
Post: #7
RE: Bent Chain Link
dave_sd is right. An adjustable wrench will work, just be careful when you bend it back in place. As far what causes that is a number of things I won't get into. One question I do have is are ya gonna replace the chain? I would just in case.

Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Apr 5, 2011 08:02 AM
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nameused Offline
Senior Member

Sacramento, California
Posts: 189
Joined: Oct 2010
Post: #8
RE: Bent Chain Link
(Apr 5, 2011 08:02 AM)Bill Wrote:  dave_sd is right. An adjustable wrench will work, just be careful when you bend it back in place. As far what causes that is a number of things I won't get into. One question I do have is are ya gonna replace the chain? I would just in case.

Alright I'll try that. Still kind of weird that the middle ring was bent but whatever. Yeah I was planning on replacing the chain with a new one.
Apr 5, 2011 11:39 AM
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