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Old 05-08-06, 09:21 AM   #1
eric von zipper
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chain jumping around

when i'm riding, i'm having a problem with my chain jumping around my rear cassette from sprocket to sprocket without me shifting. anyone know why and how to stop it? thanks.
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Old 05-08-06, 10:06 AM   #2
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Quote:
Originally Posted by eric von zipper
when i'm riding, i'm having a problem with my chain jumping around my rear cassette from sprocket to sprocket without me shifting. anyone know why and how to stop it? thanks.
A few questions:

1. Did you replace your chain recently?
2. Does it shift both up and down the cassette?
3. Does it occur when under load or no load?
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Old 05-08-06, 10:24 AM   #3
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1. Did you replace your chain recently?
No, but I did get a new wheel set and put the old cassette from the rear wheel on the new.
2. Does it shift both up and down the cassette?
Yes.
3. Does it occur when under load or no load?
I'm not sure what you mean by 'load.' If you mean me being on the bike, then yes it does.
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Old 05-08-06, 10:33 AM   #4
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btw. the bike is a scattante r-550
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Old 05-08-06, 08:23 PM   #5
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Quote:
Originally Posted by eric von zipper
1. Did you replace your chain recently?
No, but I did get a new wheel set and put the old cassette from the rear wheel on the new.
2. Does it shift both up and down the cassette?
Yes.
3. Does it occur when under load or no load?
I'm not sure what you mean by 'load.' If you mean me being on the bike, then yes it does.

1. If you replaced the chain or cassette without replacing the other, I would've said you need a new cassette or chain, respectively. It sounds like you have the same drive train as before since you transferred the old cassette to a new wheel; hence one would not expect a problem.

2. OK

3. No load would be spinning the crank in a repair stand (or holding the rear wheel off the ground and cranking. In my (limited) experience, I often find the bike to shift fine and act "normal" when there is no load applied. However, when riding, gremlin shifts would occur. In my case, I've always found the cassette to be worn.

4. Did you break the chain open recently? For swapping out a rear wheel, you would not have to remove the chain, but perhaps you were in a cleaning frenzy and soaked the chain. If you did break the chain, you might have a stiff link (assuming you don't have a Powerlink type of master link).

5. Finally, I doubt it would make a difference, but experiment by putting the cassette on the old wheel and see if the problem persists. Perhaps the new wheel isn't aligned properly in the frame.
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Old 05-09-06, 09:00 AM   #6
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Thanks MudPie!
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Old 05-09-06, 09:43 AM   #7
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Tweak the barrel adjuster on your RD to increase or decrease your tension. Same cassette and same chain should be fine. Not every hub is exactly the same.
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Old 05-09-06, 11:58 AM   #8
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Quote:
Originally Posted by capwater
Tweak the barrel adjuster on your RD to increase or decrease your tension. Same cassette and same chain should be fine. Not every hub is exactly the same.
+1

Do the Rear and Front Derailleur Adjustments shown here:

http://www.parktool.com/repair/byregion.asp?catid=53

...if you want to cover all of your bases.
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Old 05-09-06, 12:23 PM   #9
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Quote:
Originally Posted by capwater
Tweak the barrel adjuster on your RD to increase or decrease your tension. Same cassette and same chain should be fine. Not every hub is exactly the same.
+2
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Old 05-10-06, 07:56 AM   #10
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Quote:
Originally Posted by capwater
Tweak the barrel adjuster on your RD to increase or decrease your tension. Same cassette and same chain should be fine. Not every hub is exactly the same.
+3.

It could be any of a number of exotic problems, but in all likelihood, it's probably a simple derailleur tension adjustment.
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Old 05-10-06, 11:32 AM   #11
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looks like i'll "Tweak the barrel adjuster on your RD to increase or decrease your tension." when i get a free moment... thanks guys
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Old 05-10-06, 11:36 AM   #12
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I've created a problem once with inadequate torque on the ring (name??) that holds the cassette. I presume that by doing so I offset the chainline.
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