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Chain Keeps Getting Stuck

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Chain Keeps Getting Stuck

Old 08-02-11, 07:17 AM
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bsc77
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Chain Keeps Getting Stuck

I brought my bike in for a "deluxe" tuneup. They strip it down, clean all parts, degrease, then re-assemble and lube it up. I suppose this is commonly done once a year or so.

When I brought it in they checked the chain using a chain tool of some sort and said that I needed a new chain, as well as a new cassette. It's a used bike from 2003 and I'm certain they weren't replaced before, so no big deal.

I picked up the bike and now on 3 out of 3 rides I went on when i shifted my front derailleur to go from the small to the big ring, the chain is sticking to the small ring. It's only happened once per ride, but that's enough for me to be concerned. All I need to do is pull over and kind of knock it off the small ring and I'm good to go.

Any ideas what could be causing this? I have a race on Sunday and I'm not confident going into it with this issue going on.
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Old 08-02-11, 07:22 AM
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Sounds like your front derailleur isn't adjusted properly. That's part of a tuneup and not a big deal to fix. Just bring it in and tell them - work is usually guaranteed.
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Old 08-02-11, 07:23 AM
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"Sticking" to the small ring? You mean, just not moving up to the big? If so, check the limit adjustment and the tension. If you haven't made derailleur adjustments before, note that you have to (repeatedly) make very, very small adjustments (1/4 turn) and then test.
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Old 08-02-11, 07:29 AM
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Thanks so much, I'm sure it's guaranteed, the first time I picked it up and rode it,the front derailleur wasn't working at all. I couldn't shift at all. This is supposed to be a reliable shop, I'm starting to have second thoughts.

Is there a chance it's something else? I want to go in there with some ammo b/c these guys like to make you feel like you don't know what you're doing.
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Old 08-02-11, 07:37 AM
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Originally Posted by WhyFi View Post
"Sticking" to the small ring? You mean, just not moving up to the big? If so, check the limit adjustment and the tension. If you haven't made derailleur adjustments before, note that you have to (repeatedly) make very, very small adjustments (1/4 turn) and then test.
I'll bring it back to my LBS and let them do it. Problem is that it only happens maybe 1 in every 15 shifts. It works most of the time, but that's not good enough at this point.

EDIT: The chain does move to the big ring, most of it anyway, there is a portion that gets stuck on the little one, so basically I have 90% of the chain on the big ring, and a small piece on the small. Ughhh.
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Old 08-02-11, 08:03 AM
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Probably just a minor derailleur adjustment. On your end, just make sure you are moving the shift lever all the way in till it clicks and continue to pedal.

Good luck
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Old 08-02-11, 08:46 AM
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Doesn't sound a derailleur adjustment problem to me.
Sounds like the OP is describing chain suck, usually only happens on the small rings of MTB's.
Probably worn small chain ring. How badly was that old chain worn?
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Old 08-02-11, 09:23 AM
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Originally Posted by Steev View Post
Doesn't sound a derailleur adjustment problem to me.
Sounds like the OP is describing chain suck, usually only happens on the small rings of MTB's.
Probably worn small chain ring. How badly was that old chain worn?
I was thinking chain suck too - as was the earlier poster who asked about "what do you mean by sticking"

OP - you have kind of described it as not shifting from small to big. Is that what is happening? In other words are you only noticing the issue when you got to shift? This would be as opposed to shifting to the small ring and having the chain "stick" to the small chainring meaning it doesn't come off of it at the bottom of the stroke and comes back around the top causing the rear derail to fling it's cage forward, etc. This is "chain suck".
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Old 08-02-11, 10:18 AM
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Also, a remote possibility is there's a tight link. While unlikely, it can't hurt to check. See here for info on how: http://www.parktool.com/blog/repair-...ct-5-ct-6-ct-7
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Old 08-02-11, 11:30 AM
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Another possible is a bent/damaged tooth on the small chainring.
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Old 08-02-11, 11:56 AM
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Originally Posted by Psimet2001 View Post
I was thinking chain suck too - as was the earlier poster who asked about "what do you mean by sticking"

OP - you have kind of described it as not shifting from small to big. Is that what is happening? In other words are you only noticing the issue when you got to shift? This would be as opposed to shifting to the small ring and having the chain "stick" to the small chainring meaning it doesn't come off of it at the bottom of the stroke and comes back around the top causing the rear derail to fling it's cage forward, etc. This is "chain suck".
OK let me describe this better, and thanks for taking the time to help. When I shift from the small to the large chain ring, the chain moves to the large ring, BUT a portion of it physically lodges itself into the teeth of the small ring and doesn't budge. So at that point I can no longer pedal as a portion of the chain is stuck on the teeth of the smaller ring. I'll pull over and give it a light whack with my hand and it then comes free. I'll then hold the back wheel in the air, and push the pedal with my hand, the chain will move to the larger ring.
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Old 08-02-11, 12:19 PM
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Sounds like a form of chain suck. Take it back in and reference it and see if an adjustment will improve it. If not then your ring may be worn out.
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Old 08-02-11, 12:28 PM
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Originally Posted by Psimet2001 View Post
Sounds like a form of chain suck. Take it back in and reference it and see if an adjustment will improve it. If not then your ring may be worn out.
Thanks for the info, so it seems by taking the advice of my LBS I'm now in a worse situation than I was before! I was fine with the old cassette and chain, no issues! I take it replacing the rings is a quick fix?
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Old 08-02-11, 12:34 PM
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Well....if the chainring ends up being the culprit then it's pretty safe to say that your chain and cassette were REALLY worn out. They seem to have probably done the right thing in that case. If they have to replace a chainring then yes it is fairly simple, shouldn't take long and shouldn't cost a ton. I would avoid buying a whole new crank but don't be surprised if they try to steer you in that direction. The larger ring will be less worn because it engages more teeth with the chain when running, lessening the load
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Old 08-02-11, 12:38 PM
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Originally Posted by Psimet2001 View Post
Well....if the chainring ends up being the culprit then it's pretty safe to say that your chain and cassette were REALLY worn out. They seem to have probably done the right thing in that case. If they have to replace a chainring then yes it is fairly simple, shouldn't take long and shouldn't cost a ton. I would avoid buying a whole new crank but don't be surprised if they try to steer you in that direction. The larger ring will be less worn because it engages more teeth with the chain when running, lessening the load
Great, much appreciated. 5th trip to the LBS in 5 days !!!! Woo hoo!!!
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Old 08-02-11, 12:49 PM
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Originally Posted by bsc77 View Post
Thanks for the info, so it seems by taking the advice of my LBS I'm now in a worse situation than I was before! I was fine with the old cassette and chain, no issues! I take it replacing the rings is a quick fix?
Crank the chain on the small chainring slowly and watch the chain. You likely have a bent tooth or a burr on a tooth. Watch for any hops in the chain or for anything out of the ordinary. If you have a bent tooth, you can straighten it with an adjustable wrench. If you have a tooth with a burr, you can file the burr off.

Also watch the rear derailer for a stiff link. A stiff link will show up as a hop in the chain as it goes around the lower pulley.
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Old 08-02-11, 01:07 PM
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Originally Posted by cyccommute View Post
Crank the chain on the small chainring slowly and watch the chain. You likely have a bent tooth or a burr on a tooth. Watch for any hops in the chain or for anything out of the ordinary. If you have a bent tooth, you can straighten it with an adjustable wrench. If you have a tooth with a burr, you can file the burr off.

Also watch the rear derailer for a stiff link. A stiff link will show up as a hop in the chain as it goes around the lower pulley.
OK, I'll check it out when I get home. Thanks for the info.
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Old 08-02-11, 06:01 PM
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Back from my trip to my LBS... They took a look and didn't see any issues with the front chain rings, nor the front derailleur. Once on the rack the guy was able to duplicate my issue and took a look at the chain. It's a 9 speed chain on an 8 speed cassette. I asked in a perfect world if they were building out a new bike would they do this or would they use an 8 speed chain? The answer was obvious. I told them I would appreciate it if they switched it to an 8 speed to match my cassette.

When I got home and did some research it turns out this COULD be the issue. While the 9 speed chain should work fine with the cassette, there are instances where a new 9 speed chain doesn't agree with older chain rings. I'm not sure if this is the end of this ordeal, but I really hope so.
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Old 08-03-11, 08:44 AM
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Originally Posted by bsc77 View Post
Back from my trip to my LBS... They took a look and didn't see any issues with the front chain rings, nor the front derailleur. Once on the rack the guy was able to duplicate my issue and took a look at the chain. It's a 9 speed chain on an 8 speed cassette. I asked in a perfect world if they were building out a new bike would they do this or would they use an 8 speed chain? The answer was obvious. I told them I would appreciate it if they switched it to an 8 speed to match my cassette.

When I got home and did some research it turns out this COULD be the issue. While the 9 speed chain should work fine with the cassette, there are instances where a new 9 speed chain doesn't agree with older chain rings. I'm not sure if this is the end of this ordeal, but I really hope so.
Well, while it might work in principle...

Get an 8 speed chain - they are really cheap now that 10 speeds... or is it 11, or 12 or infinity+1...are all the rage. Install it and be happy.
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