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Old 11-15-12, 09:44 PM   #1
grimcow
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Chain "skip"? Any idea?

Just recently my chain at times seems to almost skip, my pedals go about half way around until they hit any kind of resistance again. I went ahead and gave my bike a head to toe cleaning despite it already being quite clean just to make sure i didnt have **** stuck anywhere. I don't think this has helped. Like I said it doesnt always happen but the skips kind of make me a little unsure at times as they usually happen when im really hitting the gas or just as i start to pedal (usually at a traffic light so everyone gets to see me almost fall Is there a chance my cogs are just getting old or any other suggestions?

Btw I ride a '10 Rockhopper comp with discs.. So iv been on it 2ish years and have never replaced anything cept the grips n pedals. I ride almost every day but alot of it has been on the street to work/class. Anyways sorry for the long read, any ideas would be helpful. Thanks in advance.
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Old 11-15-12, 09:45 PM   #2
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my bad<---repostyed in bike mech area
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Old 11-16-12, 12:09 PM   #3
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they will be all over it. the mechanics forum on BF is really, really good.

but yes, when your chain and cassette wear, this can happen. another thing to check is your rear derailleur adjustment. it can try to 'hunt' into the next lowest or highest gear if your cable tension needs adjusting.

they should go over all this very thoroughly in the mechanics forum.
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Old 11-16-12, 05:39 PM   #4
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thanks
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Old 11-16-12, 07:04 PM   #5
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I suspect it's a worn cassette and chain. After you have replaced the cassette and chain you should be skip free. I recommend replacing your chain yearly if you ride often, since chains are relatively inexpensive your expensive cassette will last many years . The chain lengthens(stretches) when worn cutting new ramps in the cassette teeth that causes skipping.
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Old 11-16-12, 10:53 PM   #6
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I have never replaces my chain yet. Looks like i'm a year over the allotted two years. I do ride very often and rode it all of last winter too. Despite what I need to replace to fix the skip I think I also will be picking up a new chain.
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Old 11-17-12, 06:32 AM   #7
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Check out measuring chain wear near the bottom of the page: http://sheldonbrown.com/chains.html

Your chain wears the quickest, so it will need to be replaced along with the cassette. You will also want to give the chainrings a good look over - if you have a lot of teeth that come sharp points, you'll want to replace those along with the chain and cassette.

With your new chain, be sure to check the chain wear as you - either with a specific tool or the ruler method above. If you are more on top of chain wear, you'll be able to avoid replacing the cassette/chainrings when your chain is worn out. I typically go through a few chains for every cassette/chainrings.
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Old 11-18-12, 07:16 AM   #8
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Can a missing tooth on a cog cause slippage (not as bad as grimcow's experience though)?
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Old 11-18-12, 09:24 PM   #9
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EDIT: make sure you aren't looking at a gear tooth that is shorter to enable shifting. Some teeth per every gear are like that. It's called a ramp.

(Original reply below)

Missing gear teeth are not acceptable at any time. You need to replace a cassette or chain ring immediately after damage occurs which breaks a tooth.

If if's just wear, either the ring/cog wasn't well-made, or is way beyond time to replace.
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Old 11-19-12, 11:24 AM   #10
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Its good to make sure your chain is clean and flexes. In the early days I had a dirty chain and kept adjusting the derailer. I was using WD-40 as a lube. It was attracting dirt and was stiff as a steel rakil. It finally broke. I asked a shop if it could be fixed, they said the real problem was the rider, could he be fixed. They then threatened to whip me with dirty chains if I ever used WD-40 on my bike. Good lubes and a clean chain are god things.

BTW-it was a good shop, still is.
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Old 11-26-12, 11:59 AM   #11
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Quote:
Originally Posted by Daspydyr View Post
Its good to make sure your chain is clean and flexes. In the early days I had a dirty chain and kept adjusting the derailer. I was using WD-40 as a lube. It was attracting dirt and was stiff as a steel rakil. It finally broke. I asked a shop if it could be fixed, they said the real problem was the rider, could he be fixed. They then threatened to whip me with dirty chains if I ever used WD-40 on my bike. Good lubes and a clean chain are god things.

BTW-it was a good shop, still is.
Lmao great shop.

To the OP: if it usually happens after a stop, it may be a rear derailer problem. Sometimes when the derailer is off or stiff, it will not take up all of the slack when you pedal backwards. So when you are stopped and pedal back to put the pedal in the optimal position, you have only part of the contact area between chain and cog, and when you get on it, it skips.
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