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Old 03-31-09, 10:24 AM   #1
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Need 8 spd chain for Campy

This is for bike that's used only on trainer. Chain suddenly started jumping. No stiff links I can find. Well lubed chain. Have eg 1500 miles on the chain (all on trainer). No obvious deformity of rear derailleur.

LBS has SRAM PC 830 chain. Is it compatible with Campy 8 spd (Record)?

https://www.starbike.com/php/product...g=en&pid=10990
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Old 03-31-09, 10:28 AM   #2
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Are you sure the problem isn't with the shift cable adjustment? Only 1500 miles of indoor use should not begin to wear out a chain.
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Old 03-31-09, 10:35 AM   #3
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Yeah, I doubt it's the chain...
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Old 03-31-09, 10:46 AM   #4
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possibly

Started suddenly. Had been humming along prior....
Happens in both chainrings.
Worse with worse chainline.
Shifts fine.
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Old 03-31-09, 10:53 AM   #5
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Also can reproduce while
-under minimal tension
-pedaling backwards
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Old 03-31-09, 11:05 AM   #6
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are you sure the chain isn't bent or twisted? if is then replace the links than are or the chain.
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Old 03-31-09, 11:12 AM   #7
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are you sure the chain isn't bent or twisted? if is then replace the links than are or the chain.
No kinks that I can see.

Perhaps chain has >1.5k on it. Maybe 2,000 "trainer miles".
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Old 03-31-09, 11:13 AM   #8
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Are you sure the problem isn't with the shift cable adjustment? Only 1500 miles of indoor use should not begin to wear out a chain.
Please elaborate on the cable adjustment.
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Old 03-31-09, 06:08 PM   #9
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the barrel adjustment on the derailure.
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Old 03-31-09, 06:38 PM   #10
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Please elaborate on the cable adjustment.
See the Park Tool web site for details.
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Old 04-01-09, 01:38 PM   #11
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the barrel adjustment on the derailure.
Thx, tried that. Did not help.

On closer inspection, chain is BENT. Looking at chain from atop, (with good chainline) most links are straight, but 3-4 are clearly angled/bent eg 10-15 degrees.

New chain should fix.

However, I'm not clear why this happened. I do put this trainer through tough workouts. However I weigh only 150#

Not sure how to prevent recurrence w/ new chain. Don't want to give up my intervals..
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Old 04-01-09, 03:07 PM   #12
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New SRAM PC 830 chain from LBS works fine.
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Old 04-01-09, 03:13 PM   #13
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the chain could get bent by "hard pedaling" during shifting. when shifting gears use a slower cadence. after the shift you can go back to your faster cadence. you could hurt the chain by removing or mounting the bike in the trainer. in other words the chain got bump into the trainer without you knowing it.
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