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Skipping Chain

Old 07-19-09, 05:28 PM
  #1  
thepinto201
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Skipping Chain

The derailleurs are perfectly tuned, brand new chain, cassette, and chain rings. New rear wheel, still same problem.

Whenever i stand up to pedal hard up hills or even on flat trail, my bike makes this disgusting noise and the chain skips or something. Sometimes the chain even falls off from the chain slip. (like in the video)

http://www.youtube.com/watch?v=wU_fdH-AOV8

All components are properly lubed with the appropriate lubricants... All i can guess is something with the bottom bracket or my new thought is that maybe the chain is too long?

I am so thankful for any insight anyone has, two shops have already tried to fix it and failed.
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Old 07-19-09, 05:48 PM
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badmother
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Chainlenght should be measured yes, but are you sure your chain is right for the cassette?

Also there is the lump that the cassette is attached to (forgot the name just now, is it freehub?). Is something slipping innside? If chain is right for cassette and chainlenght is right it must be that one. I must sleep now, can not remember the name of things.

edit: If it is the lump you remowe the cassette, the axel plus bearrings. Get a big (10mm?) hex key and pui it in where the axel goes. Unscrew, and replace with a new one. I had to do this once but the problem I had ws not exactely like yours. I do not often ride up such hills as showed on the wideo, especially not with that bike so maybe it could still have been the same problem.

Last edited by badmother; 07-19-09 at 05:53 PM.
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Old 07-19-09, 09:25 PM
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Drakee
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Hi, I don't have much experience with bikes but I've had the same problem that you had. I spotted a spot in my chain where it was slightly bent and went I took it to my LBS and told them about the problem, they took a look at it and fixed it. Ever since, it's been riding smoothly.
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Old 07-19-09, 09:35 PM
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You might have a tight link in your chain. Assuming you used a pin and chain tool to rejoin the chain (opposed to connecting with a master link), the link with the new pin might be binding. This is not uncommon. With your bike in a stand or on the ground, back pedal slowly and see if one link doesn't act odd when travelling thru the rear pulleys. Or you can take your chain off the front chainring and inspect each link for ease of rotation.

If you do find an offending link, see this: http://www.parktool.com/repair/readhowto.asp?id=53
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Old 07-20-09, 09:24 PM
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thepinto201
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Thanks everyone,
It's attached with a scram powerlink, but i think you guys might be on to something.
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Old 07-20-09, 10:15 PM
  #6  
neil0502
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Originally Posted by Drakee View Post
I took it to my LBS and told them about the problem, they took a look at it and fixed it. Ever since, it's been riding smoothly.
Um. What'd the LBS do? Replace the chain?
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Old 07-27-09, 05:45 PM
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thepinto201
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Problem located: The rear drop'ins are stretched open, so the wheel is slipping around a bit when i really torque it... All i can do is try and crack the frame.
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Old 07-28-09, 06:34 AM
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Take a piece of threaded rod 6" or so long, & place in the drop-ins of the rear. . Put washers, then nuts on the outside & get them tight up against the frame. Then tighten each side 1/2 turn alternately, til it squeezes the frame together to the right widtgh. You will probably have to remove the rod & retry a couple of times. HOPEFULLY, the frame is not warped.
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Old 07-28-09, 07:24 AM
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Originally Posted by Esteban32696 View Post
Take a piece of threaded rod 6" or so long, & place in the drop-ins of the rear. . Put washers, then nuts on the outside & get them tight up against the frame. Then tighten each side 1/2 turn alternately, til it squeezes the frame together to the right widtgh. You will probably have to remove the rod & retry a couple of times. HOPEFULLY, the frame is not warped.
Bad idea and not necessary. If the frame is carbon or aluminum, it's a particularly bad idea.

The width between the dropouts without the hub in place is not that critical. Once the skewer is tightened, it will hold the hub properly.
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Old 07-28-09, 07:58 AM
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If it isn't that, it could be the shifters. I had grip shif before and they had play in it, thought it was a bent drop out. After the LBS "couldn't get it right" I figured it was time to get new shifters, which coincidentally fixed the problem.
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Old 07-28-09, 08:15 AM
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Find a new LBS...
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